Open to opportunities

Frank Harpster

@frankharpster

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Senior Full-Stack Developer specializing in scalable web and cloud systems.

Netherlands

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What I'm looking for

I’m seeking senior engineering roles where I can build scalable, test-driven cloud-native applications, improve performance and reliability, and mentor teams in agile environments.

I am a Senior Full-Stack Developer with 12 years' experience building scalable, high-performance applications across fintech, e-commerce, and healthtech. I specialize in React, Next.js, Node.js, TypeScript, and cloud-native architectures on AWS and GCP, and I focus on delivering reliable, production-grade systems.

At PayXpert I engineered a global financial dashboard platform and implemented GraphQL APIs reducing query latency by 30%, while at Wehkamp I created micro-frontends and refactored monoliths to modular APIs, cutting deployment time by 50%. I achieve high automated test coverage using Playwright, Jest, Cypress, and React Testing Library, and I automate CI/CD pipelines with GitHub Actions and CircleCI.

I value performance, scalability, and developer productivity, and I bring hands-on experience with micro-frontends, real-time dashboards, API design, and cloud deployments. I deliver consistent UI libraries, strong accessibility practices, and secure authentication patterns to produce maintainable, user-focused products.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Developer

PayXpert

Sep 2021 - Jul 2025 (3 years 10 months)

Engineered a high-performance financial dashboard platform adopted by global enterprises, reducing query latency by 30% and improving load times by 25% via Next.js optimizations and GraphQL caching.

React Next.js Express TypeScript GraphQL PostgreSQL Redis GitHub Actions

Senior Full-Stack Developer

Wehkamp

Mar 2018 - Sep 2021 (3 years 6 months)

Built scalable e-commerce micro-frontends and modular Node.js APIs, reducing deployment time by 50% and decreasing page load times by 35% through Next.js SSR and caching strategies.

React Node Express MongoDB Next.js Docker AWS S3 Cloudfront Cypress Jest

Senior Front-End Developer

Philips Healthcare

Jan 2013 - Mar 2018 (5 years 2 months)

Developed real-time healthcare analytics dashboards and backend services, improving clinical responsiveness with WebSockets and Redis pub/sub while ensuring accessibility and HIPAA-aligned security.

React D3.Js WebSockets MongoDB Redis Docker Kubernetes Jest