Flutter Product Engineer (Mobile App Developer)

Job description

• Own products and features from beginning to end - originate ideas, understand the strategy and goals behind them, ship to production with real users, iterate on feedback, and stay responsible for their ongoing success.
• Scope features and projects, including writing handover / technical design documents (as built) - the person who built a feature is the best person to document it.
• Improve application performance - ship technical improvements that make the product faster, more stable, and ready to scale.
• Sweat the UI and interaction details - crafting a clean, pleasant experience is a daily habit, not an afterthought.
• Improve how we work, not just what we build: refine development processes, drive improvements in code quality and engineering best practices - and hold a zero-bug standard: bugs get fixed promptly, not stockpiled in a backlog.
• Work closely with designers to craft thoughtful UX/UI - ship and own the basic experience using the design system, deciding when to bring in design to polish - and collaborate with the Customer Success team to learn how the product is actually being used.
• Bring a tester's mindset - testing is part of building, not someone else's job. You own the quality of what you ship and stand behind it.

Your skills and experience

What we're looking for

• 3-5 years building customer-facing mobile applications end-to-end as a full-time software engineer - ideally at a product or SaaS startup, high-growth environment, or consultancy with a high engineering bar, where you've shipped real software for real customers and stayed long enough to see the impact of your technical decisions.
• Excellent English & communication: professional working proficiency (C1 level, IELTS 6.0, or equivalent). You don't need the certificates, but you should be comfortable communicating at this level - you can articulate and explain your solutions with confidence in English.
• A natural problem solver - you enjoy untangling hard problems and can move confidently from a user's problem to the right solution.
• Strong product sensibility: you care about UX, speed, and polish - a genuine love of beautiful, well-crafted work; you want to understand why, and you push back when something doesn't feel right.
• AI-native - you naturally reach for AI tools in your daily work to move faster, learn quicker, and raise the quality of what you ship.
• High ownership mentality: comfortable working without heavy PM overhead - self-directed, hands-on, takes a feature from idea to shipped, comfortable with ambiguity, knows when to get help, ships something, learns, and iterates.
• You move fast because you're having fun and want to deliver value here and now - not because someone's watching you.
• A grown-up: low-ego, flexible, kind, considerate, and professional - able to put ego aside when making decisions (this is about attitude, not age or experience).

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What we're NOT looking for

• You like management checking in, reviewing, and verifying your work multiple times.
• You're looking for a cushy 9-to-5 job to coast.
• You tend to over-architect solutions when simpler, more pragmatic approaches are more appropriate.

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Technical requirements

• Proficient in Flutter and Dart - you've shipped at least one production app on iOS and/or Android.
• Solid understanding of state management (e.g. Riverpod, Bloc, or equivalent) and when to use what.
• Comfortable with mobile-specific concerns: offline-first architecture, local storage / caching, push notifications, app lifecycle, and real-time updates over WebSockets.
• Experience integrating REST APIs and handling async data flows cleanly - consuming OpenAPI/Swagger-described endpoints, auth tokens (JWT), pagination, retries, and optimistic UI.
• Familiar with app store deployment - TestFlight, Google Play, and release management.
• Comfortable working in TypeScript on a Node.js backend - you can read, extend, and debug a service you didn't write.
• Able to add or modify REST endpoints in a NestJS codebase: DTOs and validation, controllers/services, and keeping the API contract clean for mobile clients.
• Nice to have: platform channels (native iOS/Android bridging), background services, or push delivery via FCM/APNs.

Why you'll love working here

• Growth opportunities: we'll support your learning and development.
• A collaborative, fun team: you'll work with super-talented folks, sharing laughs and good vibes every day.

Perks & benefits we offer

• 13-month salary
• 14 days of annual leave
• 5 days of sick leave
• 1 day of birthday leave
• Company trip
• Frequent team-building budget - our folks often use this for weekly coffee catch-ups or fun weekend activities together.
• Private health insurance for you and one family member
• Birthday and Tet holiday gifts
• Annual salary review