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I'm a full-stack web developer with six years' experience delivering scalable, production-grade web applications for enterprise clients in finance, media, and consultancy. I'm skilled across the .NET, JavaScript/TypeScript and AWS ecosystems, and I specialise in building robust, testable systems and integrating smoothly into agile teams. I recently completed an MSc in Software Engineering at the Polytechnic University of Valencia, with my thesis researching the impacts of generative AI tools on enterprise development workflows. UK citizen currently based in Spain, available for remote contract work, open to occasional travel.…I'm a full-stack web developer with six years' experience delivering scalable, production-grade web applications for enterprise clients in finance, media, and consultancy. I'm skilled across the .NET, JavaScript/TypeScript and AWS ecosystems, and I specialise in building robust, testable systems and integrating smoothly into agile teams. I recently completed an MSc in Software Engineering at the Polytechnic University of Valencia, with my thesis researching the impacts of generative AI tools on enterprise development workflows. UK citizen currently based in Spain, available for remote contract work, open to occasional travel.

Zack Marsden

Full Stack Developer, Web Developer, Front-End Developer, +2

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I'm a full-stack web developer with six years' experience delivering scalable, production-grade web applications for enterprise clients in finance, media, and consultancy. I'm skilled across the .NET, JavaScript/TypeScript and AWS ecosystems, and I specialise in building robust, testable systems and integrating smoothly into agile teams. I recently completed an MSc in Software Engineering at the Polytechnic University of Valencia, with my thesis researching the impacts of generative AI tools on enterprise development workflows. UK citizen currently based in Spain, available for remote contract work, open to occasional travel.…I'm a full-stack web developer with six years' experience delivering scalable, production-grade web applications for enterprise clients in finance, media, and consultancy. I'm skilled across the .NET, JavaScript/TypeScript and AWS ecosystems, and I specialise in building robust, testable systems and integrating smoothly into agile teams. I recently completed an MSc in Software Engineering at the Polytechnic University of Valencia, with my thesis researching the impacts of generative AI tools on enterprise development workflows. UK citizen currently based in Spain, available for remote contract work, open to occasional travel.

Available to hire

I’m a full-stack web developer with six years’ experience delivering scalable, production-grade web applications for enterprise clients in finance, media, and consultancy. I’m skilled across the .NET, JavaScript/TypeScript and AWS ecosystems, and I specialise in building robust, testable systems and integrating smoothly into agile teams.

I recently completed an MSc in Software Engineering at the Polytechnic University of Valencia, with my thesis researching the impacts of generative AI tools on enterprise development workflows.

UK citizen currently based in Spain, available for remote contract work, open to occasional travel.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Spanish; Castilian

Advanced

Work Experience

Software Developer at Citywire

March 1, 2024 - October 20, 2025

London-based financial news publisher and events organiser. Developed features and optimisations for an in-house event management system; multiple Angular front-end apps; .NET 7 microservices with event-sourced data using EventStoreDB and AWS infrastructure via Terraform; built a centralised Kinesis stream for other teams to write their own consumers; created a library of custom Angular Material components, including a rich text editor and Google Maps input; built APIs to serve iOS/Android apps developed by an external team; participated in SCRUM with per-sprint demos; manual testing at events to gather attendee feedback.

Software Consultant at Infinity Works (part of Accenture)

July 1, 2022 - October 20, 2025

Remote consultancy for public and private sector clients. Implemented features and fixes across tooling projects for an insurer; front-end React/Next.js; NestJS API; PostgreSQL; AWS infrastructure via Terraform; developed AWS Lambda functions in TypeScript and a new NestJS API to manage data workflows; acted as client liaison and led requirements gathering and design.

Software Developer at AJ Bell

October 1, 2021 - October 20, 2025

Developed new features for a major online investment platform with 50,000+ unique monthly users. Created and updated Angular components, supported unit tests with Jasmine, and end-to-end tests with BrowserStack/Cypress; integrated new functionality into a central back-end API and connected microservices (ASP.NET Core), handling data operations across web apps, databases, message queues and third-party services; collaborated with DevOps to create multi-stage Jenkins pipelines for deployment across environments on AWS; contributed to modernising development processes and dashboards using Grafana.

Junior Software Developer at Zenzero Solutions Ltd

November 1, 2019 - October 20, 2025

IT support and software solutions provider. Managed and maintained an ASP.NET MVC/AngularJS enterprise data management app with configurable front-end; daily client communications and on-site configuration; collaborated with clients from recruitment, risk management, communications, logistics, counselling and manufacturing to gather requirements; built IT solutions using ASP.NET Core and Angular.