Looking for a job

Mark Harnyk

@markharnyk

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Senior backend engineer specializing in Go, Node.js, cloud infrastructure and applied AI.

Poland

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What I'm looking for

I’m looking for a backend engineering role focused on building reliable, efficient, long-lived systems.

I value simple architectures, clear ownership, and pragmatic decisions, and I enjoy working on performance, correctness, and maintainability over time.

I am a Senior Backend Engineer with over 10 years of experience building and operating scalable server-side systems, specializing in Go and Node.js (TypeScript). I design and maintain backend services and platform components, with a focus on correctness, performance, and long-term maintainability.

I have worked in product companies and startups on systems that require clear ownership, predictable behavior, and pragmatic architectural decisions.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Namecheap

Jan 2023 - Jan 2025 (2 years)

Developed platform solutions and AI integrations, building an internal SDK (5–10 services) with SLA management, automatic PagerDuty routing, structured logging, and OpenAI-based product features; created AI evaluation and integration testing frameworks.

OpenAI API AWS Kubernetes Docker CI CD Node OpenAI Agentic AI Jenkins

Senior Software Engineer

SweepBright

Jan 2020 - Jan 2023 (3 years)

Implemented scalable backend systems in Go and cloud infrastructure, building an asynchronous AWS Step Functions export processing up to 10,000 listings/day and an event-driven MongoDB Atlas Search sync handling ~100,000 updates/day; mentored engineers and conducted code reviews.

Go AWS Step Functions MongoDB Atlas Docker CI CD Backend Infrastructure GraphQL

Senior Software Developer

Bizzabo

Jan 2016 - Jan 2020 (4 years)

Built platform and frontend features including white-label multi-domain support and React UI components, and authored Kubernetes deployment configurations to support global event organizer websites.