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I'm paying close attention to LLM-assisted development: code review, integration scaffolding, and documentation workflows. The tools are changing quickly, so I'm focused on what improves production work without weakening quality.
Senior Backend Engineer
Frenky Harry.
Backend systems for payments, commerce, and crypto.
Senior backend engineer with 10+ years building ecommerce, fintech, crypto exchange, and B2B payment systems. I design reliable services, lead bank and payment-gateway integrations, and turn complex product requirements into production-ready backend platforms.
Chapter 01
About
Illustration — Niko Wiratma
I've loved computers since middle school. They weren't widely available where I grew up, so I'd go to computer rental shops just to experiment with MS Word — printing WordArt was the highlight. In high school, my school finally built its first computer lab, and I spent more nights there than I probably should have. That's where I first discovered the web and decided I wanted to build websites.
I studied Information Technology at Maranatha Christian University in Bandung. Job hunting as a fresh graduate was anything but easy, and I eventually decided Bandung wasn't where I'd grow fastest. I took a Web Developer offer at Tokopedia, moved to Jakarta, and started building software professionally.
Chapter 02
Work Experience
Selected Role
Senior Backend Engineer @ XenithPay
July 2024 → Present
XenithPay helps merchants accept and move payments across gateways and banking partners. I lead system design and own integrations that keep merchant payments reliable across small-business and enterprise use cases.
- Architect core platform capabilities end to end, balancing reliability, throughput, and operational simplicity for payments-grade workloads.
- Lead gateway and banking integrations across API contracts, reconciliation, settlement, incident response, and partner-specific compliance.
- Design pluggable backend modules so new partners and payment methods come online without re-architecting the core, keeping the long tail of merchant integrations manageable.
- Drive the team's adoption of LLM-assisted development across code review, documentation, and integration scaffolding to ship faster without trading off quality.
- Partner with product, ops, and merchant-success teams to keep onboarding, settlement, and dispute flows running smoothly across small-business and enterprise tiers.
Languages
- Go
Technologies
- PostgreSQL
- Redis
- ClickHouse
- Typesense
- OpenFGA
- OpenTelemetry
Tools
- AWS
- ClickStack
- Claude.ai
- Codex
- Open-weight LLMs
Chapter 03
Current Focus
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I'm also going deeper into systems fundamentals: the layers underneath the languages and frameworks I use every day. After a decade of shipping production systems, I'm more interested in why software behaves the way it does under load.
- Available for work
- ✦
- Software engineer
- ✦
- Based in Jakarta
- ✦
- Remote welcome
- ✦
- Let's build
- ✦
Chapter 04
Contact
If you're hiring for backend work, planning a payments integration, or want to compare notes, email me. I'll reply as soon as I can.
Email Me. hello@frenky.id ↗Available for backend roles, payments integrations, and technical collaboration