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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arhandev@studio

Product users

Years experience

Payment gateways

Projects shipped

Trusted by real products and businesses

Moria Fund

BisaTopup

Berbagi.link

Sihris

Amandemy

Kasaba

Teras Labs

Bouma

Maisyah

BTIS Bojana

Numedica

E-SAROPS

Moria Fund

BisaTopup

Berbagi.link

Sihris

Amandemy

Kasaba

Teras Labs

Bouma

Maisyah

BTIS Bojana

Numedica

E-SAROPS

Services

Three ways we can work together

From full systems for your business to mentoring for your engineering team.

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$ build --custom-app

Custom Application & SaaS Development

Systems built specifically for how your business works: ERP, dashboards, e-commerce, payment systems, up to multi-tenant SaaS.

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$ join --your-team

Freelance & Project-Based Development

Need extra hands on an existing project? I join your codebase, follow your team standards, and get productive fast.

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$ mentor --ai-coding

AI Coding Mentor (Part-Time)

I help developers and teams use AI (Claude Code, Copilot, etc.) properly: faster without losing quality or architectural control.

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Selected work

Products real people use

Fintech, multi-tenant SaaS, school systems, HRIS. All running in production.

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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.

NestJSTypeORMMongoDBBullMQNext.js 16

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.

Laravel 12RedisNext.js 15TypeScriptVue 3

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.

LaravelGoReactRedisXendit

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.

Laravel 10React 18face-api.jsGoogle MapsSentry

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.

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Estimate the Cost

[email protected] · +62 812-9133-5215 · Jakarta