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reoxey/README.md

Hemraj Kerkar — Senior Software Engineer. Go, distributed systems, and healthcare interoperability. Almere, Netherlands.

LinkedIn ↗   ·   Email ↗   ·   Explore my repositories ↗

Hey, I'm Hemraj 👋

I'm a senior software engineer based in Almere, Netherlands, with 10+ years of experience, mostly in Go. I build event-driven services and distributed systems, with work spanning healthcare, e-commerce, logistics and ad tech.

At Founda Health, I work on healthcare interoperability. I reworked the architecture of AI Hub, which routes imaging studies to third-party AI vendors, and led its delivery through the final demo. My work connects DICOMweb streaming, Temporal workflows and FHIR R4B notifications, alongside patient data enrichment.

A few results from my work

12k → 20k RPS

Scaled the Go traffic backend at Mobobeat while reducing server costs by about 40%.

50%+ faster

Rebuilt Kramp's Visibility Service from Kotlin to Go, improving performance and lowering latency.

10+ services

Built DDD microservices from scratch at Kramp, using CQRS and Terraform.

What I've been building

Founda Health · Senior Software Engineer
November 2025 – Present · Amsterdam, Netherlands

  • AI Hub: Go services for DICOMweb streaming, Temporal orchestration, FHIR R4B vendor notifications and patient data enrichment.
  • Care discovery: Dutch Generics functions, including mCSD for discovering care services.
  • Observability: OpenTelemetry pipelines into ClickHouse and leadership of the analytics deployment.

Kramp · Software Engineer IV
May 2022 – October 2025 · Utrecht, Netherlands

  • Shipping: Owned the integration that turns carrier messages into delivery statuses, using Go and Terraform.
  • Product lifecycle: Built Go services on GCP that became a dependency for every team that year.
  • Platform workflows: Delivered account migration, Communication Notification V2 and translation services connecting STEP with Wordbee.
Earlier chapters · logistics and ad tech

Agathsya Technologies · Senior Software Engineer

April 2021 – February 2022 · Bengaluru, India

Led the team that shipped a truck aggregation MVP for the Dubai market, using Go and Dgraph. Designed the layered order-management architecture and built domain, gateway and data layers across 20+ Go services.

Mobobeat · Software Engineer

May 2016 – March 2021 · Goa, India

Built an ad-serving traffic backend and APIs in Go and Node.js on GCP, an IAB OpenRTB 2.5 exchange and SSP ad server, and the Android SDK used by publishers. The Go backend increased traffic from 12k to 20k requests/second with about 40% lower server costs.

My toolkit

Area Technologies & practices
Primary language Go
Systems & architecture Event-driven systems · DDD · CQRS · Hexagonal architecture · gRPC · GraphQL · Temporal
Cloud & delivery GCP · Terraform · Kubernetes · Helm · Docker · AWS
Healthcare FHIR R4B · XDS · DICOMweb · mCSD
Data & observability PostgreSQL · Redis · ClickHouse · Cassandra · MongoDB · OpenTelemetry
Engineering practice TDD · SOLID · Code review · Mentoring · Cross-team collaboration
More languages, frameworks and tools from my résumé
  • Languages & runtimes: Java, Python, Node.js, PHP, Elixir, TypeScript and JavaScript.
  • Frameworks: Vue.js, Spring Boot and Phoenix.
  • Data: MySQL, Dgraph, Neo4j and Spark.
  • AI-assisted development: Claude Code, Codex, agentic coding workflows and local LLMs.

Coding & community

Stack Overflow profile and reputation LeetCode rating GitHub followers Profile views

Competitive programming

LeetCode statistics and contest performance for reoxey

Let's connect

Happy to talk about Go, distributed systems, healthcare interoperability, or the work of taking a service from architecture to delivery.

Send me an email · Find me on LinkedIn


From Goa to the Netherlands · B.Sc. Computer Science, St. Xavier's College · Résumé aligned September 2026

Pinned Loading

  1. microservices microservices Public

    E-commerce Demo - Golang Hexagonal Microservices

    Go 6

  2. blockchain blockchain Public

    BlockChain simple implementaion in Go

    Go

  3. adtech adtech Public

    This POC implements how traffic backend works in Adtech solutions in ad performance market.

    Go 2 3

  4. myorm myorm Public

    Simple MySQL ORM which wraps around pubnative mysql driver. This orm support simple CRUD operations.

    Go

  5. benchmark benchmark Public

    speed comparison of MySQL & MongoDB in GOLANG1.6 & PHP5

    Go 14 5

  6. wavenetts wavenetts Public

    Simple Text to Speech module which connects to Google Cloud TTS API and downloads the audio file based on the text provided.

    Go