AI-Native Adaptive Full-Stack Software Engineer
I build production-ready web, mobile, and backend systems across different stacks, languages, and codebases using Claude Code, OpenAI Codex, and structured AI-assisted workflows for planning, implementation, review, testing, and release.
For founders and teams who need production software built right — web, mobile, and the backend behind it.
AI accelerates the workflow. Engineering judgment keeps the product reliable.
Replies within 1–2 business days · No obligation
Core stack
TypeScript · NestJS · .NET Core · Next.js · React · React Native · PostgreSQL · Python
AI-native, adaptive full-stack engineering across web, mobile, and backend
Selected Work
Products I've shipped and production platforms I've built on — across different stacks, domains, and product types.
Services
Full web and mobile products and the backend behind them — plus the integration and automation work around them. Built across whatever stack fits, with AI-assisted engineering and production discipline.
Featured product
A publicly released personal finance app that helps people plan money before payday — tracking bills, loans, debts, installments, income, and expenses, then forecasting what's safe to spend. Built privacy-first, with financial data stored locally on device.
A solo product I designed, built, and shipped end to end — from the first wireframe to the published Google Play release.
Capabilities
The tools and stacks I build, ship, and adapt to across web, mobile, and backend — accelerated by AI-assisted engineering, kept reliable by discipline.
Process
Clarify the product goal, users, and constraints, then write a clear spec and plan — the groundwork that makes AI-assisted implementation accurate instead of aimless.
Implement across web, mobile, and backend using Claude Code and OpenAI Codex to move fast — while the architecture and the decisions stay mine.
Review every change for correctness, security, and maintainability. AI accelerates the work; engineering judgment keeps it reliable.
Verify behavior against real cases before shipping, so speed never comes at the cost of reliability.
Deploy with secure configuration and monitoring, then improve based on real usage and feedback.
About
I'm Arvin Kent Lazaga — an adaptive full-stack software engineer. I build production web apps, mobile apps, and the backend systems behind them, and I move quickly across different stacks, languages, and codebases (TypeScript, NestJS, .NET Core, React Native, Python, and more). I've contributed to live platforms in corporate gifting and real estate, and I designed, built, and shipped my own personal-finance app, Balyria, on Google Play. I work AI-natively — using Claude Code and OpenAI Codex with rigorous planning, review, and testing — because AI accelerates the workflow, but engineering judgment keeps the product reliable.
Adaptability is the foundation. AI-assisted development is the multiplier. Production discipline is the difference.
Shipped: 3 production platforms · 1 live app on Google Play
From the blog
FAQ
Send a short project brief — the Start a Project tool walks you through it in a few minutes. I'll reply within 1–2 business days with a few clarifying questions and a suggested next step. There's no obligation; it's a conversation starter.
I scope each project with you after understanding the goal — fixed-scope or hourly depending on the work. No fixed packages and no surprise costs: you'll know what you're getting and what it costs before we start.
Yes — most of my work is joining established systems and shipping inside them, following the patterns already there and keeping production stable. I move across TypeScript, Next.js, React Native, NestJS, .NET Core, Python, and PostgreSQL rather than forcing one stack.
AI (Claude Code and OpenAI Codex) accelerates the implementation; every change still goes through planning, review, and testing with real engineering judgment. You get the speed without the unreliability people associate with AI-generated code.
Production web apps, mobile apps, backends and APIs, payment and commerce integrations, and automation — software real users depend on, not throwaway prototypes.
I'm available for new projects, working remotely from the Philippines across time zones. Replies within 1–2 business days.
Let's build
Whether it's a product to build, a backend to untangle, or a focused engineering engagement — I'd love to hear about it.
Prefer email? Write me at arvinkentslazaga@gmail.com
Replies within 1–2 business days · No obligation