Jack Foxcroft
Verified Expert in Engineering
Full-stack Engineer and Developer
Bristol, United Kingdom
Toptal member since July 9, 2026
Jack has spent 10 years delivering and building scalable enterprise software, cloud-native platforms, and real-time 3D applications across engineering, nuclear, and technology industries. He has strong expertise across the stack, with a focus on front-end engineering using modern technologies, including TypeScript, TanStack, Svelte, Next.js, Node.js, Three.js, WebGL, WebGPU, and cloud platforms such as AWS, Azure, and GCP.
Portfolio
Experience
- Python - 11 years
- Next.js - 9 years
- Django - 8 years
- Amazon Web Services (AWS) - 6 years
- Three.js - 3 years
- Supabase - 3 years
- Multi-agent Systems - 2 years
- AI Agent Orchestration - 2 years
Preferred Environment
TanStack Router, Next.js, React Native, Zustand, React Three Fiber (R3F), WebGPU, WebGPU Shading Language (WGSL), TypeScript, Zod, Svelte
The most amazing...
...AI-powered dashboard I've built enabled real-time interaction with autonomous agents and improved user engagement by over 40%.
Work Experience
Full-stack Engineer
Self-employed
- Led end-to-end front-end development using TypeScript across React, React Native, Svelte, and Next.js, delivering type-safe, self-documenting codebases with reduced runtime errors.
- Built and shipped a cross-platform React Native mobile application with strict TypeScript configuration, achieving seamless iOS/Android deployment and compile-time safety across shared codebases.
- Developed advanced 3D visualizations using Three.js with TypeScript type definitions, integrated with real-time back-end data services for live data visualization.
- Built agent-powered dashboards using TypeScript, React, Node.js, and Tailwind CSS, enabling users to interact with AI agents in real time whilst visualizing reasoning processes.
- Implemented advanced state management using Redux Toolkit, Zustand, and Svelte stores with full TypeScript support, eliminating a category of runtime type errors.
- Developed real-time features using WebSockets and Server-Sent Events with type-safe message contracts for live data streaming and collaborative user experiences.
- Designed and deployed LangGraph-based multi-agent systems using TypeScript and Python, orchestrating autonomous AI agents for complex task execution, research, summarisation, and decision-making workflows.
- Designed and deployed retrieval-augmented generation (RAG) systems leveraging vector databases to improve LLM response accuracy and reduce hallucinations.
Project Engineer
Atkins
- Supported the project manager, project director, and chief engineer in delivering engineering software solutions for a major nuclear industry client.
- Developed and optimized GraphQL APIs with end-to-end TypeScript typing across front-end and back-end systems, improving maintainability and type safety.
- Designed and developed full-stack web applications using Django REST Framework and React, delivering end-to-end features from database design to front-end implementation.
- Built secure API-driven architectures supporting authentication, user management, analytics dashboards, and business workflow automation.
- Built interactive data visualization dashboards using React, TypeScript, and Three.js to support engineering project monitoring and decision-making.
Full-stack Engineer
HYDAC
- Architected and delivered full-stack web applications using TypeScript across React and Svelte front ends, and Node.js, Express, and Fastify back ends, ensuring type safety and consistency throughout the technology stack.
- Developed and maintained Python applications supported by React and Svelte frontends and PostgreSQL databases, improving application performance through code splitting, lazy loading, and Redis caching strategies.
- Engineered interactive 3D web experiences using Three.js and TypeScript, delivering smooth cross-platform performance across desktop and mobile devices.
- Developed and maintained scalable back-end services using Django and Django REST Framework, building secure RESTful APIs for web and mobile applications.
Experience
AI Trading App
Education
Bachelor's Degree in Engineering
University of Northampton - Northampton, UK
National Certificate in Mechanical Engineering
Abingdon Witney College - Abingdon Campus, UK
Skills
Libraries/APIs
Node.js, React, Stripe, OpenAI API, Claude API, REST APIs, Three.js, jQuery, Framer Motion, React Testing Library, WebGPU, WebGPU Shading Language (WGSL), Zod
Tools
GitHub, Terraform, Git, Claude, Claude Code, Apache Airflow, BigQuery, Sentry, Codex, GitLab, Bitbucket, Jira, Confluence, Jenkins, Mocha, Pytest, TanStack Router
Languages
TypeScript, Python, JavaScript, CSS, HTML, SQL, GraphQL, C#, Swift, HTML5, CSS3, Sass
Frameworks
React Native, Next.js, Agentic Frameworks, Tailwind CSS, Redux, Svelte, LangGraph, Django REST Framework, Express.js, Fastify, Django, Flask, NestJS, Jest, Cypress
Paradigms
Back-end Architecture, REST, Microservices, Low-code Development, DevOps, Real-time Systems, Role-based Access Control (RBAC), Automation, Microservices Architecture, Test-driven Development (TDD), Model Context Protocol (MCP)
Platforms
Docker, Firebase, Kubernetes, Amazon Web Services (AWS), AWS Lambda, Jupyter Notebook, Apache Arrow, Google Cloud Platform (GCP), iOS, Apache Kafka, Android, WordPress, Azure, AWS IoT, LangSmith
Storage
MySQL, MongoDB, Database Management, JSON, Databases, NoSQL, PostgreSQL, Redis, Google Cloud, Relational Databases, Data Pipelines, Azure Cosmos DB, Elasticsearch
Other
FastAPI, CI/CD Pipelines, Web Development, Supabase, Full-stack, API Integration, Integration, Third-party Integration, Full-stack Development, Authentication, Cloud Storage, APIs, Software Architecture, Architecture, AI-based Content SEO, Answer Engine Optimization (AEO), Back-end, AI-assisted Development, Software Engineering, API Management, AI-generated Code, User Interface (UI), Minimum Viable Product (MVP), Push Notifications, RESTFul APIs, Integrations, RAG Architecture, RAG Systems, Agentic RAG Systems, Scalability, Debugging, Workflow Automation & System Integration, LangChain, Pinecone, Artificial Intelligence (AI), Multi-agent Orchestration, Multi-agent Systems, AI Agents, Large Language Models (LLMs), Workflows, AI Integration, LLM Integration, Agentic AI, Webhooks, Supabase Auth, Lovable, Resend, Data Engineering, Amazon Bedrock AgentCore, Agentic AI Systems, Technical SEO, AI-enabled Search, Terraform Cloud, Internet of Things (IoT), Streaming, GPS, Telematics, Cloud Architecture, Observability, Site Reliability Engineering (SRE), Infrastructure, Fintech, Mobile App Development, User Experience (UX), Chatbots, Fitness, Training, Reviews, Workflow, Workflow Automation, Communication, Security, Bun, Data Processing, Distributed Systems, Vector Databases, Zustand, SvelteKit, WebSockets, Retrieval-augmented Generation (RAG), OpenAI, Prompt Engineering, Embeddings, Semantic Search, AI Agent Orchestration, Function Calling, Vapi, GitHub Actions, JWT Authentication, Weaviate, React Three Fiber (R3F), Engineering
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