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Carmel Eve - Software Engineer I

Carmel is the third person to graduate from our Apprenticeship Scheme.

Meet Carmel

Carmel has recently graduated from our apprenticeship scheme.

Over the past four years she has been focused on delivering cloud-first solutions to a variety of problems. These have ranged from highly-performant serverless architectures, to web applications, to reporting and insight pipelines and data analytics engines. She has been involved in every aspect of the solutions built, from deployment, to data structures, to analysis, querying and UI, as well as non-functional concerns such as security and performance.

Throughout her apprenticeship, she has written many blogs, covering a huge range of topics. She has also given multiple talks focused on serverless architectures. The talks highlighted the benefits of a serverless approach, and delved into how to optimise the solutions in terms of performance and cost.

She is also passionate about diversity and inclusivity in tech. Last year, she became a STEM ambassador in her local community and is taking part in a local mentorship scheme. Through this work she hopes to be a part of positive change in the industry.

Carmel won "Apprentice Engineer of the Year" at the Computing Rising Star Awards 2019.

Quick tip – Removing totals from a matrix in Power BI

Quick tip – Removing totals from a matrix in Power BI

Carmel Eve

Here is a quick tip on how to remove column summarisation from a matrix in Power BI!
Quick tip – Updating the sort order of a column in Power BI (avoiding circular references)

Quick tip – Updating the sort order of a column in Power BI (avoiding circular references)

Carmel Eve

Here's a quick tip on how to alter the sort order of a column in Power BI!
Why you should apply for an apprenticeship at endjin...

Why you should apply for an apprenticeship at endjin...

Carmel Eve

At endjin we solve complex problems which cover a huge range of cloud services, data science techniques and industries. The work we do is massively varied and in this there is a huge opportunity. Hear about Carmel's experience in completing her apprenticeship here at endjin, and why you should consider our apprenticeship scheme!
Maintaining communication and relationships within a remote team

Maintaining communication and relationships within a remote team

Carmel Eve

With a lot of people all over the world suddenly finding themselves working remotely, I thought I’d share some thoughts on what I think is one of the most challenging parts of a company going fully remote: maintaining relationships.
How can I improve my data model in Power BI?

How can I improve my data model in Power BI?

Carmel Eve

Configuring model properties in Power BI allows you to create a model which is far more discoverable and is able to better support the visualisations you need. There are several different model properties which can be configured, some of these focus on discoverability whilst others allow you to alter the ways in which data is sorted/displayed/summarised in the reports.
What should I do next? - How to choose accomplishable tasks

What should I do next? - How to choose accomplishable tasks

Carmel Eve

If, like me, you often find yourself unable to decide how to spend your time productively, it might be worth giving this post a read! Here Carmel runs through some of the things to consider when deciding which task to tackle next. These tasks can be anything from "send out finance report", to "call mum", to "decide where to go on holiday next year". We have a huge amount of options when deciding how to spend our time, so here are some strategies for whittling down that choice!
How does Azure Key Vault help me secure my data?

How does Azure Key Vault help me secure my data?

Carmel Eve

Azure Key Vault is used to protect encryption keys and secrets. These keys and secrets can be used to access encrypted data and protected services. Individual Key Vaults can be used to preserve security information for isolating keys and secrets. The keys stored can be either hardware or software protected. Access to the keys and secrets is controlled using Azure Active Directory, RBAC and access policies.
Learning DAX and Power BI – CALCULATE

Learning DAX and Power BI – CALCULATE

Carmel Eve

This is the final blog in a series about DAX and Power BI. This post focuses on the CALCULATE function, which is a unique function in DAX. The CALCULATE function has the ability to alter filter contexts, and therefore can be used to enable extremely powerful and complex processing. This post covers some of the most common scenarios for using CALCULATE, and some of the gotchas in the way in which these different features interact!
Data modelling with Power BI - Loading and shaping data

Data modelling with Power BI - Loading and shaping data

Carmel Eve

In order to effectively work with our data in Power BI we need to structure the model as best to support the representations we need. This process is called data modelling. Data modelling includes loading, shaping, cleansing and enhancing the data.This post runs through some of the important steps used in data modelling, and gives an example of loading and shaping data using Power BI.
Handling upheaval and navigating uncertain times

Handling upheaval and navigating uncertain times

Carmel Eve

I doubt that it's escaped anyone's notice that we have suddenly been thrown into a world which is pretty unrecognisable from that of even a few weeks ago. And I don't think any of us can claim to be managine it well all of the time, but in this post Carmel runs through some of the strategies and coping mechanisms which have helped her adjust.
Learning DAX and Power BI – Related Tables and Relationships

Learning DAX and Power BI – Related Tables and Relationships

Carmel Eve

This is the sixth blog in a series about DAX and Power BI. This post focuses on relationships and related tables. These relationships allow us to build up intricate and powerful models using a combination of sources and tables. The use of relationships in DAX powers many of the features around slicing and page filtering of reports.
Recording of Azure Oxford talk on combatting illegal fishing with Azure (for less than £10/month)

Recording of Azure Oxford talk on combatting illegal fishing with Azure (for less than £10/month)

Carmel Eve

Jess and Carmel recently gave a talk at Azure Oxford on "Combatting illegal fishing with Machine Learning and Azure - for less than £10 / month). The recording of that talk is now available for viewing!The talk focuses on the recent work we completed with OceanMind. They run through how to construct a cloud-first architecture based on serverless and data analytics technologies and explore the important principles and challenges in designing this kind of solution. Finally, we see how the architecture we designed through this process not only provides all the benefits of the cloud (reliability, scalability, security), but because of the pay-as-you-go compute model, has a compute cost that we could barely believe!
Effectively managing mental capacity

Effectively managing mental capacity

Carmel Eve

We are currently living in extremely uncertain times. As we try to process these changes, many of us have found that we do not have the same mental capacity we once did. Some of that might be due to extra constraints on our time, but a lot of our brain-power is also spent trying to process the huge worldwide changes which are currently taking place. In this blog, Carmel talks about some techniques for managing that mental capacity, and how those apply in an ever-changing world.
Learning DAX and Power BI – Table Functions

Learning DAX and Power BI – Table Functions

Carmel Eve

This is the fifth blog in a series on DAX and Power BI. This post focuses on table functions. In DAX, table functions return a table which can then be used for future processing. This can be useful if, for example, you want to perform an operation over a filtered dataset. Table functions, like most functions in DAX, operate under the filter context in which they are applied.
Building a proximity detection pipeline

Building a proximity detection pipeline

Carmel Eve

At endjin, our approach focuses on using scientific experimental method to support the creation of fully proved and tested decision making, and the use of scientific research to support our work. This post runs through how we applied that process to creation a pipeline to detect vessel proximity.This is an example which is based around the project we recently worked on with OceanMind. In this project we helped them to build a #serverless architecture which could detect vessel proximity in close to real time. The vessel proximity events we detected were then fed into machine learning algorithms in order to detect illegal fishing!Carmel also runs through some of the actual calculations we used to detect proximity, how we used #data projections to efficiently process large quantitities of incoming data, and the use of #durablefunctions to orchestrate the processing.
Learning DAX and Power BI - Aggregators

Learning DAX and Power BI - Aggregators

Carmel Eve

This is the fourth blog in a series about DAX and Power BI. We have so far covered filter and row contexts, and the difference between calculated columns and measures. This post focuses on aggregators. We cover the limitations of the classic aggregators, and demontrate the power of the iterative versions. We also highlight some of the less intuitive features around how these functions interact with both filter and row contexts.
Learning DAX and Power BI – Calculated Columns and Measures

Learning DAX and Power BI – Calculated Columns and Measures

Carmel Eve

This is the third blog in a series about learning DAX and Power BI. The first two blogs focused on filter and row contexts. We are now moving on to talk about calculated columns and measures. These are the main features used to support the display of complex visuals. They allow you to combine columns, aggregate values, reformat data, and much more. The difference between these features can get a bit confusing so we've attempted to make that clearer using some concrete examples!
Optimising C# for a serverless environment

Optimising C# for a serverless environment

Carmel Eve

In our recent project with OceanMind we used #AzureFunctions to process marine vessel telemetry from around the world. This involved processing huge quantities of data in close to real time. We optimised our processing for a #serverless environment, the outcome of which being that the compute would cost less than £10 / month!This post summarises some of the techniques we used, including some concrete examples of optimisations we made.#bigdata #dataprocessing #dataanalysis #bigcompute
An experimental approach to software development

An experimental approach to software development

Carmel Eve

The application of scientific experimental process to software development leads to the development of fully-validated solutions. This approach provides you with confidence in designs and means that you can quickly identify ideas which are not worth pursuing. At endjin we use the ideas of hypotheses and experimentation when designing any solution and this gives us full confidence in the designs we produce. In this post we outline the steps and advantages of using this approach.
Learning DAX and Power BI – Row Contexts

Learning DAX and Power BI – Row Contexts

Carmel Eve

Here is the second blog in a series around learning DAX and Power BI. This post focuses on row contexts, which are used when iterating over the rows of a table when, for example, evaluating a calculated column. Row contexts along with filter contexts underpin the basis of the DAX language. Once you understand this underlying theory it is purely a case of learning the syntax for the different operations which are built on top of it.
Learning DAX and Power BI - Filter Contexts

Learning DAX and Power BI - Filter Contexts

Carmel Eve

Here is the first in a series of blog posts around understanding DAX and Power BI. This post focuses on filter contexts. which are a central concept which is vital for being able to write effective and powerful DAX!In this series Carmel walks through the main ideas and syntax surrounding the DAX language, and provides examples of using these over a dataset. DAX is an extremely powerful language. Using these techniques it is possible to build up complex reports which provide the insight you really need!
Five quick tips for public speaking

Five quick tips for public speaking

Carmel Eve

We all get nervous in the run up to a public speaking event. However, there are things we can do which help alleviate some of the pressure. Here are 5 quick tips around preparing for a talk!
Mental health and managing the challenges of remote working

Mental health and managing the challenges of remote working

Carmel Eve

Remote working has many benefits. It allows us a huge amount of freedom, especially around managing our personal and professional lives. But alongside these benefits it also brings challenges. When you combine these challenges with certain aspects of mental health it can sometimes be difficult to manage. However, there are also ways in which remote work can enable us to control our environments in a way that would be extremely difficult if working from a conventional office. We have been a fully remote company now for over two years, and in this post Carmel shares some of her experiences of managing mental health whilst remote working.
NDC London - A dive into responsible and inclusive technology

NDC London - A dive into responsible and inclusive technology

Carmel Eve

NDC London day 1 was mainly focused around the responsibility we all face when developing new technology. As developers we cannot absolve ourselves of the consequences of not considering diversity and inclusivity when designing our solutions.
Careers in software development - different paths into the industry

Careers in software development - different paths into the industry

Carmel Eve

There are many different paths into the tech industry, Carmel has been speaking at some local schools about joining the industry from a scientific background. In this post she discusses the crucial tools which science gives you which can help you succeed in tech!
Building a secure data solution using Azure Data Lake Store (Gen2)

Building a secure data solution using Azure Data Lake Store (Gen2)

Carmel Eve

In this blog from the Azure Advent Calendar 2019 we discuss building a secure data solution using Azure Data Lake. Data Lake has many features which enable fine grained security and data separation. It is also built on Azure Storage which enables us to take advantage of all of those features and means that ADLS is still a cost effective storage option!This post runs through some of the great features of ADLS and runs through an example of how we build our solutions using this technology!

Speaking at NDC London: Combatting illegal fishing with Machine Learning and Azure

Carmel Eve

In January 2020, Carmel is speaking about creating high performance geospatial algorithms in C# which can detect suspicious vessel activity, which is used to help alert law enforcement to illegal fishing. The input data is fed from Azure Data Lake Storage Gen 2, and converted into data projections optimised for high-performance computation. This code is then hosted in Azure Functions for cheap, consumption based processing.
How Azure DevTestLabs is helping me climb Everest

How Azure DevTestLabs is helping me climb Everest

Carmel Eve

Remote working allows us to work from anywhere we want. This brings a huge amount of flexibility in freedom, however we do need the help of a working laptop! When Carmel's laptop gave in just before a trip, she used Azure DevTestLabs to allow her to continue to work using a 10 year old Mac that probably couldn't wouldn't have been up to the task alone...
Increasing performance via low memory allocation in C#

Increasing performance via low memory allocation in C#

Carmel Eve

We worked on a project recently which required us to build a highly performant system for processing vast quantities of messages in real time. We had made the decision to run this processing using Azure Functions with C#. This post runs through some of the techniques we used for writing highly performant, low allocation code, including data streaming, list preallocation and the relatively new C# feature: Span<T>.
Demystifying machine learning using neural networks

Demystifying machine learning using neural networks

Carmel Eve

Machine learning often seems like a black box. This post walks through what's actually happening under the covers, in an attempt to de-mystify the process!Neural networks are built up of neurons. In a shallow neural network we have an input layer, a "hidden" layer of neurons, and an output layer. For deep learning, there is simply more hidden layers which allows for combining neuron's inputs and outputs to build up a more detailed picture.If you have an interest in Machine Learning and what is really happening, definitely give this a read (WARNING: Some algebra ahead...)!
Design patterns in C# - The Composite Pattern

Design patterns in C# - The Composite Pattern

Carmel Eve

This blog is part of a series around design patterns. This post focuses on the composite pattern. The composite pattern is often used in situations where you want to me able to treat groups and individuals in the same way during processing.
Secure function-to-function authentication in Azure without the need for credentials

Secure function-to-function authentication in Azure without the need for credentials

Carmel Eve

Building a secure solution on Azure can be a daunting task. Using Azure Functions and Managed Identities, we have built up a pattern for giving services access to one another, woithout the need to store credentials. These managed identities can be given access to necessary resources. For example, they can be granted roles and added to access control lists in ADLS Gen2 accounts, or the ability to access keys in key vault. This means that data can be securely accessed without needing to store connection strings or app passwords.
Design patterns in C# - The Builder Pattern

Design patterns in C# - The Builder Pattern

Carmel Eve

This is the second blog in a series around design patterns. This post focuses on the builder pattern. The builder pattern is used when there is complex set up involved in creating an object. Like the other creational patterns, it also separates out the construction of an object from the object's use.
Reactive data processing and a huge wealth of learning - A year as an Apprentice II at endjin

Reactive data processing and a huge wealth of learning - A year as an Apprentice II at endjin

Carmel Eve

Here is a blog written by our apprentice Carmel after her second year of the apprenticeship. We think it demonstrates the huge variety of things we get to work on here at endjin, and highlights the best of the blogs that Carmel produced through during the year - of which there were a lot!If you think an apprenticeship with us is something which might interest you - send a CV through to hello@endjin.com!
Design Patterns in C# - Factory Method and Abstract Factory

Design Patterns in C# - Factory Method and Abstract Factory

Carmel Eve

This is the first blog in a series about design patterns. This blog focuses on the differences between the factory method and abstract factory patterns. The factory method is a method which takes the creation of objects and moves it out of the main body of the code. An abstract factory is similar to the factory method, but instead of a method it is an object in its own right.
Using Databricks Notebooks to run an ETL process

Using Databricks Notebooks to run an ETL process

Carmel Eve

Here at endjin we've done a lot of work around data analysis and ETL. As part of this we have done some work with Databricks Notebooks on Microsoft Azure. Notebooks can be used for complex and powerful data analysis using Spark. Spark is a "unified analytics engine for big data and machine learning". It allows you to run data analysis workloads, and can be accessed via many APIs. This means that you can build up data processes and models using a language you feel comfortable with. They can also be run as an activity in a ADF pipeline, and combined with Mapping Data Flows to build up a complex ETL process which can be run via ADF.
Incorporating software architecture into agile projects

Incorporating software architecture into agile projects

Carmel Eve

Software architecture and Agile project planning are often seen to be at odds. However, here at endjin we think that the way in which they intersect solves a lot of the common issues surrounding architecture. The key to successful architecture is constantly keeping the drivers in mind and having a tight communication loop as the architecture is implemented. These concepts are ones which are key to agile project management, and the combination of these two disciplines can be extremely powerful and successful when applied correctly.
Exploring Azure Data Factory - Mapping Data Flows

Exploring Azure Data Factory - Mapping Data Flows

Carmel Eve

Mapping Data Flows are a relatively new feature of ADF. They allow you to visually build up complex data transformation sequences. This can aid in the streamlining of data manipulation and ETL processes, without the need to write any code! This post gives a brief introduction to the technology, and what this could enable!
A code review with NDepend Part 2: The initial review

A code review with NDepend Part 2: The initial review

Carmel Eve

At endjin we have a high quality bar when it comes to our code. As part of this we carry out regular code reviews. One of the tools we have used for these code reviews is NDepend. This is the second in a blog series written as we carried out that process. This post focuses on the insight you can quickly gain just by glancing at the NDepend UI.
A code review with NDepend Part 1: Quality metrics

A code review with NDepend Part 1: Quality metrics

Carmel Eve

At endjin we have a high quality bar when it comes to our code. As part of this we carry out regular code reviews. One of the tools we have used for these code reviews is NDepend. This is the first in a blog series written as we carried out that process. This post runs through the different metrics used by NDepend, and the reasons that each of these can be an indication of code quality.
A beginner's guide to agile estimation and planning

A beginner's guide to agile estimation and planning

Carmel Eve

In this post Carmel runs through some of the main principles behind agile estimation and planning. At endjin we use a lot of these techniques in our projects and this is a great post which highlights the reasons behind some of what we do. The key motivation behind good estimation is to be useful for project planning. There is a huge amount of inherent uncertainty surrounding estimates, especially early in the project. So, we shift our aim from 100% precise, or "true", estimates, and towards providing estimates which are useful and accurate. Carmel also runs through the steps in an agile delivery and release process. Definitely worth the read if you have an interest in agile and/or project management!

11 cheers for binary (And 3 for hexadecimal)!

Carmel Eve

Sometimes it's good to go back to the basics... This is a quick post that runs through binary and hexadecimal numbers, and how those relate to our every day computing!
Rx operators deep dive Part 5 – Thank you for joining me on this journey

Rx operators deep dive Part 5 – Thank you for joining me on this journey

Carmel Eve

This is the final blog in a series which delves into how the Rx operators work under the covers. This series aims to provide a greater understanding of Rx and its operators. This post focuses on the JOIN operator.
Avoiding deployment locking errors by running Web and Functions Apps from packages

Avoiding deployment locking errors by running Web and Functions Apps from packages

Carmel Eve

This post walks through the fix for DLL locking errors when trying to deploy an Azure Function. The solution was to switch over to the new "deploy from package" option when deploying the functions. This fixes the file locking problem because instead of deploying the DLLs, the function will run from a package file added to its directory.
Rx operators deep dive Part 4: A window into scheduling in Rx

Rx operators deep dive Part 4: A window into scheduling in Rx

Carmel Eve

This is the fourth blog in a series which delves into how the Rx operators work under the covers. This series aims to provide a greater understanding of Rx and its operators. This post focuses on the WINDOW operator.
Rx operators deep dive Part 3: Re-grouping our thoughts

Rx operators deep dive Part 3: Re-grouping our thoughts

Carmel Eve

This is the third blog in a series which delves into how the Rx operators work under the covers. This series aims to provide a greater understanding of Rx and its operators. This post focuses on the GROUP operator.
Managing applications using Azure AD, service principals and managed identities: A permissions story

Managing applications using Azure AD, service principals and managed identities: A permissions story

Carmel Eve

The complexities around Azure Active Directory can be difficult to understand. This post runs through some of the key concepts - AAD apps, service principles, managed identities, and walks through an example of how to set some of this up!
Rx operators deep dive part 2: Slowly aggregating knowledge

Rx operators deep dive part 2: Slowly aggregating knowledge

Carmel Eve

This is the second blog in a series which delves into how the Rx operators work under the covers. This series aims to provide a greater understanding of Rx and its operators. This post focuses on the AGGREGATE operator.
Rx operators deep dive part 1: Where observables meet LINQ

Rx operators deep dive part 1: Where observables meet LINQ

Carmel Eve

This is the first blog in a series which delves into how the Rx operators work under the covers. This series aims to provide a greater understanding of Rx and its operators. This post focuses on the WHERE operator.
Understanding Rx: Making the interfaces, subscribing and other Subject<T>s finally click

Understanding Rx: Making the interfaces, subscribing and other Subject<T>s finally click

Carmel Eve

At endjin we've done quite a lot of work around reactive data processing. This post is a great introduction to the main concepts in reactive programming. It runs through the main classes in Rx.NET and provides an easy-to-follow explanation of this powerful (and somewhat complex) area of .NET.
Overflowing with dataflow part 2: TPL Dataflow

Overflowing with dataflow part 2: TPL Dataflow

Carmel Eve

This is the second blog in a series about data flow. This post delves into TPL dataflow.The task parallel library is a .NET library which aims to make parallel processing and concurrency simpler to work with. The TPL dataflow library is specifically aimed at making parallel data processing more understandable via a pipeline-based model.
Overflowing with dataflow part 1: An overview

Overflowing with dataflow part 1: An overview

Carmel Eve

This is the first blog in a series about dataflow. The series focuses on TPL dataflow, but this post gives an overview of dataflow as a whole.The crucial thing to understand when using dataflow is that the data is in control. In most conventional programming languages, the programmer determines how and when the code will run. In dataflow, it is the data that drives how the program executes. The movement of data controls the flow of the program.
Women in technology: Driving positive change in the industry

Women in technology: Driving positive change in the industry

Carmel Eve

Anyone can be a role model. You don't have to be a veteran in the industry to inspire someone. There are constantly people coming through the pipeline behind you, and in that there is an opportunity to make a real difference.What can you do to drive positive change and help combat the gender imbalance in the tech industry?
Whose package is it anyway? Why it's important to minimise dependencies in your solutions...

Whose package is it anyway? Why it's important to minimise dependencies in your solutions...

Carmel Eve

This is a post about the importance of reducing your dependencies as much as possible when designing solutions.If as much as possible is under your own control, there is far less room for synchronization errors and update conflicts.
A tentative step into the worlds of asymmetric encryption and Blockchain

A tentative step into the worlds of asymmetric encryption and Blockchain

Carmel Eve

Here is a quick dive into encryption and blockchain. This post goes into the ideas behind hashing, and how these translate into encrypted messaging techniques. It also delves blockchain and how signing and versioning allow for consistent and immutable transactions. Definitely worth a read if you're interested in these concepts!
OneNote - helping me to find my feet in research

OneNote - helping me to find my feet in research

Carmel Eve

Everyone learns differently. In this post Carmel describes how OneNote can be used to aid and enhance research. As an avid note taker and blogger, she highlights how the ability to Ctrl-F into written text in OneNote has greatly improved her productivity!
Garbage collection, a memorandum on memory in C#

Garbage collection, a memorandum on memory in C#

Carmel Eve

Garbage collection is the process in .NET of cleaning up unused memory. Here is a great post which explains how it works under the covers. If you have ever wanted to get an understanding of exactly what is going on behind the scenes when you write C# code, then this is the post for you!
From collection vans to collection interfaces - my first week back at endjin

From collection vans to collection interfaces - my first week back at endjin

Carmel Eve

Here is a post that Carmel wrote not long after she started back at endjin. Time has really flown since then, but it provides some great insight into how our apprenticeships work!If an apprenticeship and endjin sounds like something that might be of interest to you, send your CV over to hello@endjin.com!
My internship at endjin – New Proposition Development, Programming, and a very long list of acronyms

My internship at endjin – New Proposition Development, Programming, and a very long list of acronyms

Carmel Eve