~/nadeesha

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About

I'm a Senior Software Engineer based in Amsterdam with 10+ years building high-performance, scalable systems in fintech and e-commerce. My expertise spans infrastructure (AWS CDK, Terraform, serverless), backend systems (TypeScript, Node.js, Nest.js, event-driven architectures), and full-stack ownership (React, GraphQL, system design).

At Otrium, I architect systems handling 10+ million monthly transactions and led the integration of Claude AI to solve multi-brand sizing challenges — reducing customer returns by 23%. Earlier, as Technical Lead at Gapstars, I guided a team through a complex 200k LOC monolith-to-microservices migration, establishing TDD practices and raising test coverage from 20% to 78%.

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Experience

  1. Senior Software Engineer — Otrium B.V.

    July 2023 – Present

    Amsterdam, Netherlands

    Full-stack platform architect building real-time systems (10M+ txns/month), integrating Claude AI for product intelligence, and mentoring engineering teams across infrastructure, backend, and frontend domains.

  2. Technical Lead — Gapstars

    February 2022 – June 2023

    Colombo, Sri Lanka

    Led architectural transformation from monolithic PHP to 8 independent Node.js/TypeScript microservices. Mentored 5 engineers, established TDD/DDD practices, and achieved zero-downtime migration of 200k+ LOC.

  3. Associate Technical Lead — Swivel Tech

    March 2020 – February 2022

    Colombo, Sri Lanka

    Built full-stack features across React frontends and serverless Node.js backends. Managed production deployments, incident response, and legacy PHP modernization.

Education

BEng (Hons) Software Engineering
University of Westminster, London — 2018

Languages

  • English — Fluent
  • Sinhala — Native

Interests & Hobbies

VR/game development (Meta Quest 3 + Unity) · Family travel · Open-source contributions · System design & mentoring

What I'm known for

  • ▸ Building production-grade AI/ML pipelines with LLMs (Claude, GPT)
  • ▸ Event-driven architectures + serverless infrastructure at scale
  • ▸ Mentoring engineers through complex technical migrations
  • ▸ Full-stack ownership (infrastructure → frontend UI)
  • ▸ Writing clear, testable, maintainable code

Currently learning

  • · Advanced LLM/RAG architectures
  • · Cost optimization for serverless workloads at scale
  • · Distributed systems & consensus algorithms
  • · VR/game development for Meta Quest

Open to collaborating on

  • · AI/ML pipelines and LLM integration patterns
  • · Open-source serverless frameworks
  • · Systems design mentorship