Paul Koh

I’m a Senior Software Engineer with 10+ years of experience building backend systems, internal platforms, APIs, and data-heavy services with Node.js, TypeScript, and Python. Based in Poland, I’ve delivered software for EU and UK teams across remote and client-facing environments.

I’m known for owning critical services, shaping architecture decisions, and turning complex business processes into tools internal teams use daily. My focus is pragmatic solutions that balance speed, maintainability, and operational stability.

At Citadel (London), I owned the design and delivery of Node.js and TypeScript backend services for real-time data workflows, improving processing latency by 30% and increasing throughput by 25% with stable core data paths under load. I also led API design for internal services used by multiple engineering teams, reducing integration regressions by 35% and strengthening monitoring with logging, tracing, and actionable alerting to cut mean time to detect issues by 40%.

Earlier at Slalom (Remote / Hybrid), I delivered cloud-ready backend services and APIs in containerized AWS environments, reducing failed releases by 25% through stronger CI/CD checks. At Allegro (Poland) and TNO (Netherlands), I built and prototyped distributed services and data pipelines, improving batch handling time by 20% and prototype processing efficiency by 15% while enhancing observability and operational support.