Senior Fullstack Engineer

Senior Fullstack Engineer

Job Summary

We are looking for senior fullstack engineers who own systems, not just features, and who set the technical bar for a team – across web frontend, backend/API, and mobile – in an agentic engineering environment where AI coding agents do much of the typing and senior engineers direct, review, and verify. At The company, a senior fullstack engineer is expected to move confidently across the entire stack:

• React/TypeScript on the web, Node or .NET on the API, React Native on mobile, and the observability, data, and CI/CD around it all.
• Over this band you grow from consistent multi-team-quality delivery (L7) to being someone the team relies on for architecture and mentoring (L9).
• We're not looking for a specialist who happens to know a bit of everything else.
• We're looking for engineers who genuinely enjoy the whole stack and can be the person the team leans on regardless of which layer the hard problem lives in this week.

Key Responsibilities

1. Systems Ownership

• Own significant systems across web, API, and mobile end-to-end – including their architecture,quality bar, and evolution
• Break down loosely-scoped problems into clear, buildable work for the team; make the call on what to build first and why
• Shepherd features through to store release, not just to the merge, when mobile is in play
• Take on the hardest / riskiest work in the team when it matters, and finish it

2. Agentic Engineering Leadership

• Set the pattern for how the team uses AI agents effectively: specifications, prompts, review discipline, evals, guardrails
• Improve the team's agent workflow measurably – throughput, defect rate, review cost – and share the wins
• Own the parts of the agent workflow that are load-bearing for quality: verification harnesses, test coverage strategy, and the humans-in-the-loop where they matter

3. Architecture & Cross-Team Design

• Shape API contracts, data models, and shared platform concerns so that web, mobile, and other product teams can build without stepping on each other
• Represent the team in architecture discussions; write and review ADRs; challenge decisions with evidence
• Keep an eye on the seams: auth, sync, observability, feature flags, release orchestration across web + mobile
• Care about performance and cost at runtime and at scale, in browser, server, and device

4. Quality, Security, & Reliability

• Own the team's quality bar: what ""done"" means, what CI must catch, what makes a release safe
• Champion secure-by-default patterns across the stack – OWASP for web/API, platform-appropriate practices for mobile
• Be part of the on-call rotation for the systems you own; treat incidents as first-class learning material, not blame

5. Coaching & Talent Growth

• Deliberately coach mid and junior engineers, code review is a teaching moment first, a gate second
• Grow the fullstack range of engineers around you; a senior fullstack engineer who leaves the team broader than they found it is doing the job
• Contribute to hiring: technical interviews, take-home reviews, calibration

6. Product & UX Partnership

• Partner with Product and Design early – shape requirements, push back on ambiguous scope, offer credible alternatives
• Bring genuine user perspective to your work; senior engineers here don't hide behind the ticket

• Applicants must be a PERMANENT RESIDENT in the Philippines
• 6+ years of professional software development, including shipped and maintained production systems across multiple stacks
• Real fullstack depth: strong in web (React/TypeScript), strong in a backend (Node or .NET), and hands-on shipped experience with React Native or equivalent mobile – or a track record of picking up whichever of these you're weakest in fast
• You've led at least one significant piece of work from problem to production, coordinating others' contributions
• Serious agentic engineering practice: not just ""I use Copilot,"" but a considered opinion on how to make a team of engineers + agents deliver reliably
• Fluent with testing strategy, CI/CD, observability, and secure coding across the stack
• Clear written and spoken communication; you can carry a technical proposal to non-engineers and to a room of engineers who disagree
• Highly regarded: mobile release engineering experience (App Store / Google Play), or UX depth strong enough to co-design product surfaces
• A plus: experience with connected devices, BLE, or IoT
  Based near Clark, Pampanga, or willing to relocate (this is an on-site role)