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Full-stack engineer with 11+ years delivering production React and Next.js applications, TypeScript services, and API-backed product features across FinTech, crypto, SaaS, and enterprise environments. Ex-Tech Lead at Bitvavo (Deloitte Fast 50) with deep experience in exchange infrastructure, Kafka streaming, and Kubernetes platform delivery, combined with hands-on SSR, API routes, and Node.js backends. Recent work includes building LLM-integrated and agentic systems (LangChain/LangGraph, OpenAI, RAG) for FinTech and DeFi clients, leading small teams, shipping containerised production services with strong observability and CI/CD practices, and collaborating in Agile delivery across remote European teams.…Full-stack engineer with 11+ years delivering production React and Next.js applications, TypeScript services, and API-backed product features across FinTech, crypto, SaaS, and enterprise environments. Ex-Tech Lead at Bitvavo (Deloitte Fast 50) with deep experience in exchange infrastructure, Kafka streaming, and Kubernetes platform delivery, combined with hands-on SSR, API routes, and Node.js backends. Recent work includes building LLM-integrated and agentic systems (LangChain/LangGraph, OpenAI, RAG) for FinTech and DeFi clients, leading small teams, shipping containerised production services with strong observability and CI/CD practices, and collaborating in Agile delivery across remote European teams.

Luke Taaffe

Full Stack Developer, Back-End Developer, Web Developer, +5

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Full-stack engineer with 11+ years delivering production React and Next.js applications, TypeScript services, and API-backed product features across FinTech, crypto, SaaS, and enterprise environments. Ex-Tech Lead at Bitvavo (Deloitte Fast 50) with deep experience in exchange infrastructure, Kafka streaming, and Kubernetes platform delivery, combined with hands-on SSR, API routes, and Node.js backends. Recent work includes building LLM-integrated and agentic systems (LangChain/LangGraph, OpenAI, RAG) for FinTech and DeFi clients, leading small teams, shipping containerised production services with strong observability and CI/CD practices, and collaborating in Agile delivery across remote European teams.…Full-stack engineer with 11+ years delivering production React and Next.js applications, TypeScript services, and API-backed product features across FinTech, crypto, SaaS, and enterprise environments. Ex-Tech Lead at Bitvavo (Deloitte Fast 50) with deep experience in exchange infrastructure, Kafka streaming, and Kubernetes platform delivery, combined with hands-on SSR, API routes, and Node.js backends. Recent work includes building LLM-integrated and agentic systems (LangChain/LangGraph, OpenAI, RAG) for FinTech and DeFi clients, leading small teams, shipping containerised production services with strong observability and CI/CD practices, and collaborating in Agile delivery across remote European teams.

Available to hire

Full-stack engineer with 11+ years delivering production React and Next.js applications, TypeScript services, and API-backed product features across FinTech, crypto, SaaS, and enterprise environments. Ex-Tech Lead at Bitvavo (Deloitte Fast 50) with deep experience in exchange infrastructure, Kafka streaming, and Kubernetes platform delivery, combined with hands-on SSR, API routes, and Node.js backends.

Recent work includes building LLM-integrated and agentic systems (LangChain/LangGraph, OpenAI, RAG) for FinTech and DeFi clients, leading small teams, shipping containerised production services with strong observability and CI/CD practices, and collaborating in Agile delivery across remote European teams.

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Intermediate

Language

English

Fluent

Work Experience

Founder & Principal AI/Full-Stack Contractor at Karmic

March 1, 2024 - Present

Delivers Next.js and React full-stack applications for FinTech and enterprise clients via remote contracting. Built Next.js apps with API routes integrated to TypeScript backends, GraphQL, and real-time WebSocket updates. Contracted for ZiffDavis (NYSE, London) shipping production React/Next.js features under Agile timelines. Engineered LLM-integrated full-stack workflows for Reya DEX with validation and dependable API consumption. Applied reusable components, state management, and cross-browser delivery across user-facing products. Deployed full-stack releases through CI/CD with Kubernetes-hosted backend services. Collaborated with backend teams on OpenAPI contracts, authentication, and platform improvements. Partnered with product stakeholders to translate requirements into scalable Next.js/React solutions.

Founder at Karmic

March 1, 2024 - Present

Founded Karmic to build modern web applications from requirements through deployment, combining React frontend work with maintainable backend services and pragmatic architecture to support fast iteration and long-term platform growth. Designed and delivered REST API integrations that connect multiple systems, turning business requirements into usable functionality across internal tools and customer-facing workflows. Worked independently in live production environments to land focused changes, extend platform capability, resolve issues, and improve stability without adding unnecessary complexity. Contributed to architecture and technical planning, defining clean service boundaries and scalable patterns. Optimized runtime behavior by tracing bottlenecks across queries, backend logic, and integration paths, then implementing targeted fixes to improve reliability. Leveraged AI-assisted engineering workflows to accelerate implementation, debugging, and analysis while maintaining code qualit

Technical Lead, Growth Engineering at Bitvavo

December 1, 2021 - July 1, 2023

Led Growth engineering at the Netherlands' largest crypto exchange with customer-facing platform delivery. Shipped TypeScript, React, and Next.js product features supporting high-volume exchange workflows. Architected a real-time notification system delivering 5 million messages at 100% delivery rate. Led release of 7+ microservices and Kubernetes migration improving platform reliability. Built event-driven UI/backend integrations with Kafka and PostgreSQL. Scaled Growth engineering from zero to 13 engineers. Improved release practices and production troubleshooting. Mentored engineers on full-stack architecture and observability.

Technical Lead, Growth at Bitvavo

December 1, 2021 - July 1, 2023

Led delivery across high-traffic exchange systems where production stability, scalable architecture, and reliable service integration were essential. Built and operated TypeScript and NestJS services with PostgreSQL, Kafka, Docker, and Kubernetes, reinforcing expertise in scalable full stack and backend platform delivery. Worked on customer-facing functionality connected to complex backend services, ensuring changes remained maintainable, responsive, and aligned with operational constraints. Improved production behavior by tracing bottlenecks through queries, messaging patterns, and service interactions, delivering focused fixes that held up under sustained load. Collaborated with engineers and stakeholders to ship functionality iteratively while maintaining code quality and reliability. Supported CI/CD and infrastructure workflows via Terraform, Helm, and Kubernetes-managed services, strengthening end-to-end ownership from implementation through release. Reviewed code and mentored eng

Senior Software Engineer at Jumbo

March 1, 2021 - December 1, 2021

Built GraphQL API microservices with Next.js/React and TypeScript services on Kubernetes with Grafana and ELK on AWS. Designed and delivered a back-office automation application eliminating five customer service roles and significant annual operational cost. Developed an in-house Kafka microservice introducing event-driven architecture and containerised deployment practices to the department.

Senior Software Engineer at Urban Sports Club

April 1, 2019 - March 1, 2021

Built scalable platform services using REST and GraphQL APIs with Next.js/React, Node.js, and PostgreSQL backed by Grafana and Sentry. Delivered data-intensive product features supporting subscription workflows in a scaling European SaaS environment. Collaborated with cross-functional Agile teams on backend integration, testing discipline, and incremental performance improvements.

Software Engineer at Urban Sports Club

April 1, 2019 - March 1, 2021

Built user-facing product experiences and supporting APIs for membership and booking workflows, strengthening hands-on full stack delivery in active production environments. Translated evolving product requirements into maintainable implementation plans, balancing speed, code clarity, and stability across shared systems. Debugged issues across client logic, data access, and service interactions to reduce user and developer friction. Contributed to clean code, refactoring, and review practices to keep shared systems extensible as product needs evolved. Collaborated closely with product and engineering stakeholders in agile cycles to shape practical technical decisions and feature trade-offs. Cultivated ownership, cross-functional communication, and reliability of live applications amid changing business requirements.

Full-Stack Engineer at McCann

March 1, 2018 - March 1, 2019

Delivered high-profile digital projects for Bentley, Vauxhall, Opel, and Sunseeker Yachts at a global creative agency. Built backend integrations and client-facing applications with Next.js/React, Node.js, TypeScript, React.js, and Laravel.

Full-Stack Engineer at DRPG

December 1, 2016 - March 1, 2018

Delivered production web applications for 8+ EU and global clients using Next.js/React, Node.js, React.js, and PHP. Supported full backend delivery from requirements through deployment with Git workflows and iterative quality improvements.

Co-Founder at Greenbet

June 1, 2015 - December 1, 2016

Co-founded and built a data-driven web platform with Next.js/React, PHP, and React.js from concept through launch. Owned end-to-end backend delivery covering data processing, service integration, and early platform architecture.