Jack Jefferies Email & Phone Number

Bristol, United Kingdom

Personal consultancy firm, and where all the bills go for my software hobby, building, or studying for my own products which I enjoy discussing to ensure they're the best possible version

Remote

At Costain I was brought in to analyse, debug, and rebuild a legacy architecture and application used for managing message signs used in Critical infrastructure for managing motorway variable message board systems. I was involved in upgrading the system from legacy Java 6 to Java 21+ and focused initially on creating a test environment that would allow us to prove our application reliability with the existing legacy software that was exported directly from the client servers and needing to be recreated. Afterwards i moved on to building a base foundation by isolating the webapp and backend API and moving away from a WAR application to a JAR application using a modern version of spring boot and spring data allowing the existing DAO to continue operating under developed integration tests, and expanding on missing test cases for core functionality such. I then helped onboard the new software consultant who continued on my initial development framework. Once all cylinders were firing I began taking on the entire process of creating the Angular application from the ground up to manage all the interactions between the web interface and hardware managing the physical message boards. This was a continuous process in which I was collaborating and extending the existing API whilst also implementing all the flexibility required in the webapp.

Bristol, England, United Kingdom

Assisting with standard day to day operations of managing a production system, helping guide other members of the team and enhance communication throughout the team whilst debugging issues throughout the development process. Contributing to the organisation and management of BAU tasks as well as pushing for a speedy, high quality review process to ensure work continues to be delivered in a timely manner. Working on the development of a multilingual platform that gave seamless translations, as well as personally migrating from using a OLTP relational database to an OLAP system to improve performance for the statistical analysis and dashboard views of the system.- Cloud Architecture design and Implementation; AWS- Fullstack development; Express REST, Angular, MySQL, Clickhouse- I18s debugging and deployment- Mentoring

City Of Bristol, England, United Kingdom

Working as the sole Full stack Software Engineer creating a mobile friendly energy dashboard, I spearheaded its development from concept to launch for my first independent software consulting project. Crafting a seamlessly responsive dashboard that delivers real-time updates and ideal mobile and web platforms UX. My work encapsulated both the creative and technical aspects; including UI/UX design, coding, and system architecture, I also embraced key DevOps principles to ensure the product's scalability and reliability.- TypeScript, React, NextJS, Tailwind CSS, Vercel CI/CD, AWS, v0.dev, Terraform- Devops Development (Vercel)- Continuous Integration and Continuous Delivery (CI/CD)- Product Development in a start-up environment managing key stake holder requirements- Server Side Rendering (NextJS. NodeJS), React Web Development

London, England, United Kingdom

I joined Pynea when there was virtually no code in sight. However, that quickly changed in the short period I was consulting this startup. Personally taking responsibility for containerising the backend GraphQL server, creating a pipeline infrastructure ensuring regression on build, and test, while deploying the containerised application, as well as creating the media management for all customer data which was stored and managed on AWS.- Cloud Architecture design and Implementation; AWS- Full Stack & Devops Development; Graphql, Palumi- Continuous Integration and Continuous Delivery (CI/CD); Gitlab- Product Management, Product Development through engagement with key application stakeholders, OpenAI support- Collaboration and Best Practices; Cloud design and deployment, Application architecture, Framework recommendations, Documentation, Disaster Recovery

Cardiff, Wales, United Kingdom

Working closely with an external consultancy that was beginning to transition a product from MVP to stable, and production ready, no longer requiring assistance from the resource heavy and expensive consultancy. Entrenching myself into a world of graphs I began here by building a federated supergraph API from the ground up. Handling data for anything from housing specifications, to user sessions, as well as informing users of critical updates to the applications they were using. I extended a new component library built with tailwind that I championed bringing forward for flexibility in customising brand identity, which later expanded to being used in multiple differently purposed but clearly branded webapps with shared authentication look, feel, and flow, and assist with data ingestion, evaluating and calculating housing solutions, and customer organisation management and much more. After the departure of the consultancy, and reformation of teams, I found myself stepping up as an interim lead, assisting with gathering the requirements for the next phases to be implemented. I also took lead and implemented almost the entirety of the devops solution leading to fast, reliable and scalable environments with DR built in from the get go. This led to templates that released both new and existing products faster having been battle tested.- Cloud Architecture design and Implementation; GCP- Full Stack & Devops Development; React, Graphql, Terraform- Continuous Integration and Continuous Delivery (CI/CD); Gitlab- Interim Lead to support Lead replacements; Product Management- Collaboration and Best Practices; Cloud design, Frameworks, Documentation, Disaster Recovery, OpenAI support, Real time data analytics

Cheltenham, England, United Kingdom

Recreating the production customer facing monolith into microservices that optimise and reduce operational costs, using lambdas to handle API requests, dynamoDB to store and retrieve customer data, and S3 for loading any configuration or images required by the service. We are also simplifying the operation of the data warehousing by migrating the legacy scripts to a more maintainable execution in AWS with help from serverless- Cloud Architecture design and Implementation; AWS- Full Stack & Devops Development; Typescript, React, Fastify, Serverless- Large scale monolith to microservice migration delivering millions in savings- Product management third party API integration

Bristol, England, United Kingdom

After successfully delivering on the previous project I was immediately re-engaged to deliver on another new public sector project, and delivering the same results while using the latest technologies with the recent introduction of Typescript while here. This was a ground up greenfield project that involved taking a dozen different funding systems used by the councils across the UK and creating a fast, modern, GDS compliant, scalable web platform that could handle varying and complex requirements each council individually needed, requiring large amounts of flexibility in the application processing for funding opportunities.- Full Stack Development; Typescript, React, Fastify, Graphql- Cloud Architecture design and Implementation; GCP- Driving insight into and implementation of Graph based APIs- Delivering GDS compliant government webapps suitable for impaired individual needs- Communication focused multi-functional made up of both client and consultancy experts in Devops, Design, Development, Test, Customer Experience, and Product Management onsite- Complying with strict data management, and security requirements, with public sector involvement

Bristol, Bristol, United Kingdom

I actively contributed and assisted in architecting a large, and complex UK critical software project protecting children and vulnerable adults, migrating an old deprecated system from one organisation and putting it directly into the hands of the public sector client. Working with sensitive data, I managed to deliver to customers ahead of strict deadlines, and above expectation, in a behaviour driven environment with extensive product engagement with customers. Working closely with the team and communicating passionately I have passed on insightful agile experience, while delivering high quality work to the team at BJSS helping to create a cohesive unit able to adapt and overcome any challenges presented.- Full Stack Development; Typescript, React, Java, Spring- Cloud Architecture design and Implementation; AWS- Critical employment safety software- Assisting implementing and discussion of system architecture- Distributed team fostering agile practices and near continuous pairing- Complex custom CMS solution with Agent interaction- Strict data compliance, and security requirements, with public sector involvement

Corsham, Wiltshire, United Kingdom

Starting my consulting career, I played a key role in assisting in the development and deployment of an urgently required interim health insurance webapp, simplifying insurance application interfaces and commercial APIs; Reducing computational resource in calculating insurance premiums, storing and managing quotes with relevant data in a relational database, bringing modern approaches to web design and development table. Which helped reduce incurring large amounts of new technical debt, and lingering debt, and bugs significantly impacting customer experience. Bringing in a reduction in pressure on the team allowing them to deliver other projects and pieces of functionality previously blocked by time lost to firefighting and manual intervention.- Improved finance calculation performance, precision, and reliability;- Full Stack Development; Java, Spring, JSP, MySQL- Modernised the approach to web design with Figma- Re-enabling project progression, and releasing

Bristol, United Kingdom

Joining a fast paced startup environment, I began delivering on multiple large key milestones in a mobile performance analytics platform capturing live data from real world devices. Such projects include migrating the old RDBMS into a new cloud based NoSQL database, and creating multiple micro services which are scalable to any size, one of which is able to parse and store compressed data at a high ingestion rate. I have helped to develop a new modern analytical platform, and managed to get the team into using a more agile approach for development. Due to pushing the team in this way we have seen an increase in delivery and opened the scope of progression to the company.- Custom Database Migration Solution; MySQL to Elasticsearch- Microservices Development; Express, GCP, Kubernetes- Analytical Platform Development; Angular- Agile Product Development and Management- Custom Role-based JWT Authorisation- Full Stack Development; Javascript, Angular, Java, In-memory Queues, Multi-threading, Spring boot/data

United Kingdom

Hungry for knowledge, and driven by my new found software passion. Experimenting with the latest and greatest tools, tech, and libraries, while also taking responsibility for developing new greenfield requirements which were used for a defence research project. I made an immediate impact by setting up CI pipeline for applications, leading to a full CD pipeline deployment with configuration, testing my knowledge by training recent graduate colleagues who were unfamiliar with the environment, leading to documentation reducing developer development setup time. I was also responsible for developing interconnected lightweight micro services, communicating with distributed noSQL clusters, using data enforcement policies on applications, and also configuring each of them through a CLI. Completing my time shortly after and becoming handy with virtualisation.- Vast Technologies Exposure; Graken, Neo4J, Ansible, KaliOS, Docker, Docker Swarm, Kubernetes- Software Development; Java, Spring boot/data/security, Kafka, REST, Microservices- Continuous Deployment System; Git, Jenkins, in-house servers- Training and Documentation - Configuring, Virtualizing, and scaling of large, complex and highly relational graph databases communicating with restful applications

Oxford, United Kingdom

As an assistant developer at Nominet my knowledge had only deepened in the development world. On top of what I was previously doing I was now developing hand-crafted code driven, rapid and accurate reports that communicate with our internal services. I also successfully completed multiple big projects, enabling internal users to analyse calls that are logged on our data warehouse, and developing a new set of customisable dashboards using a graphics library in JavaScript. I also stepped forward to assist the technical director in achieving the ISO27001 accreditation for which I created an automated report showing usage statistics of all of our DNS servers.

Oxford, United Kingdom

Working in both Java, and Business Intelligence teams with domain specific experts.Kickstarting my career by absorbing extensive knowledge, and technical skills in developing useful solutions in the fast paced tech industry, discovering what the best practices are and how they are applied in a medium sized, experienced technology institute. I improved existing reports and developed new rapid and accurate business critical analytical dashboards for internal and external customers meaning data was at hand in real time. I successfully completed multiple big projects, enabling internal users to analyse calls that are logged on our data warehouse, and developed a new set of customisable dashboards. I stepped forward to assist the technical director in achieving the ISO27001 accreditation showing usage statistics of the DNS servers. On demand writing of complex queries on-demand against databases.- Multi-product development across multiple teams; BI, Java, Perl- Analytical Dashboards; Oracle OBIEE- ISO27001 Accreditation Support contribution- Oracle Database Expertise & In-depth data Insights- CAB Responsibilities- Expanding Data Warehouse design; Oracle 11g, 12c

Bachelor Of Technology (Btech), Computer Games And Programming Skills, Mpp

Studied a magnitude of areas within the software and computing industry.

Gcse, Gcse, 2B, 7C

Maths - B Physics - B Chemistry - C Biology - C Business Studies - C English Literature - C English Language - C Art - C