FULL-STACK & FINTECH ENGINEER
Custom systems your business can trust to run on.
I build apps, SaaS, and payment systems used by hundreds of thousands of people. From planning to production, one person fully accountable.
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Product users
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Years experience
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Payment gateways
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Trusted by real products and businesses
Moria Fund
BisaTopup
Berbagi.link
Sihris
Amandemy
Kasaba
Teras Labs
Bouma
Maisyah
BTIS Bojana
Numedica
E-SAROPSMoria FundBisaTopupBerbagi.linkSihrisAmandemyKasabaTeras LabsBoumaMaisyahBTIS BojanaNumedicaE-SAROPSSERVICES
Three ways we can work together
From full systems for your business to mentoring for your engineering team.
SELECTED WORK
Products real people use
Fintech, multi-tenant SaaS, school systems, HRIS. All running in production.
Moria Fund
Full-stack: backend, web, mobile
Shariah fintech · backend, web, mobile
Shariah fintech for savings, saving circles, murabaha financing, investments, zakat, and payments. I built the full trio: NestJS backend, Next.js dashboard, and Flutter app.
BisaTopup
Backend & frontend engineer
200,000+ users · 4 billers
National PPOB platform: airtime, electricity, bills, flights. API architecture refactor + modern landing without breaking existing contracts.
Berbagi.link
Core engineer (2022 to 2026)
±18,000 users · 2022 to 2026
Link-in-bio, ticketing, and online store. My longest-running contribution: the core API, a first-party analytics engine, a Go microservice, and deploys for 8+ real events like Halal Fair and Muslim Life Fair.
Sihris
Full-stack (backend + frontend)
HRIS SaaS · used in production
HRIS SaaS: live attendance with in-browser face recognition, effective-date scheduling, per-level overtime rules, multi-level approvals.
PROCESS
Clear from day one
Discovery
We talk needs, business goals, and scale. Free, no commitment.
Proposal
Scope, cost and time estimates, proposed architecture. In writing.
Build
Iterative development with regular demos. You always know the progress.
Launch
Production deploy, data migration, and thorough testing.
Support
Maintenance, fixes, and further development as needed.
ABOUT
One engineer, full accountability.
I'm Farhan, a full-stack engineer in Jakarta. I work at the intersection of architecture, money, and security: payment gateway integrations, multi-tenant systems with strict data isolation, and structured security reviews on production code.
I use AI, particularly Claude Code, to move faster on development. But design decisions, architecture, and anything touching money or security stay with me.
Payment & Fintech
5+ gateways integrated: Xendit, Bisabiller, Singapay, PPOB billers
Security-Minded
Severity-labeled security reviews in production: IDOR, enumeration, CORS
Genuine Full-Stack
Backend, web, and Flutter mobile shipped in parallel on the same products
Values-Aligned
Islamic ethics in technology: products that are useful, honest, and halal
Have a system you want built?
Tell me what you need. Fast replies, free initial discussion.
[email protected] · +62 812-9133-5215 · Jakarta