Flutter Tech Lead

JobCubby; Warszawa; Hybrid; PLN 180,000 - 300,000; Full time

Benefits offered by this job

Remote-first

Sports allowance

Medical insurance

Mental health support

Home office budget

Language learning budget

Paid maternity/paternity leave

Childcare allowance

20+ vacation days

Unlimited sick leave

Emergency time off

Coworking compensation

Team events

Job summary

GR8_TECH builds B2B iGaming platforms for operators who play to lead. You will own and drive the frontend mobile architecture across flagship products, delivering high-throughput Flutter apps while mentoring teams.

The role requires 7+ years in software, 3+ years Flutter/Dart with native iOS/Android, and strong system design to align architectural roadmaps with product goals in a remote-first Warsaw setup.

Qualifications

• 7+ years in commercial software development with 3+ years in Flutter/Dart and native mobile.
• Strong system design thinking and performance optimization for mobile apps.
• Experience leading technical strategy in cross-functional teams.
• Proficient in Dart internals (isolates, async, null safety) and Flutter rendering.
• Hands-on with high-frequency data (WebSockets) and mobile security basics.

Responsibilities

• Own high-level mobile system architecture and define stable, fast patterns.
• Translate business goals into robust blueprints and set engineering benchmarks.
• Contribute code to critical modules and lead incident response for mobile apps.
• Mentor engineers, conduct code reviews, and drive PDPs for mobile staff.
• Standardize CI/CD and align roadmaps across cross-functional streams.

Skills

Flutter/Dart

Native iOS

Android

System design

Mobile performance

Technical strategy

State management

Dart isolates

WebSockets

Protobuf/JSON

Security standards

Code reviews

Mentorship

Tools

Melos

fastlane

Job description

to apply - email only, no card. You can also save this posting or score it againstyour profile with AI.## About the roleYou will own and drive the frontend mobile architecture for flagship products, ensuring high-performance, scalable, and stable Flutter applications. Additionally, you will mentor engineering teams, establish technical benchmarks, and align architectural roadmaps with product delivery goals.## RequirementsThe role requires 7+ years of commercial software development experience, including at least 3 years of dedicated work with Flutter/Dart and native iOS or Android development. Candidates must possess strong system design skills, deep knowledge of mobile performance optimization, and a proven ability to lead technical strategy in cross-functional environments.## BenefitsSports allowanceMedical insuranceMental health supportHome office budgetLanguage learning budgetPaid maternity/paternity leaveChildcare allowance20+ vacation daysUnlimited sick leaveEmergency time offRemote-first workTech supportCoworking compensationTeam events## Full descriptionGR8\\_TECH builds B2B iGaming platforms for operators who play to lead.We deliver full-cycle, high-impact tech designed to scale - from seamless integrations and expert consulting to long-term operational support. Our platform powers millions of active players and drives real business growth. Call it what it is: the iGaming Platform for Champions.With 1000+ GR8 people across locations and time zones, we don't just ship technology - we help operators build success stories across brands, markets, and geos.Our ambition drives us. Our people make it real.If you're a challenger in spirit and a champion in action - join us.Why this role exists:This role exists to own and drive the frontend mobile architecture across our flagship products. You'll help us scale real-time user experiences to millions of active users by delivering high-throughput, low-latency Flutter applications while elevating engineering standards across our development teams.What you'll drive:Strategy & outcomes* Own high-level mobile system architecture, defining patterns that keep our mobile apps stable, modular, and fast.* Translate business goals into robust technical blueprints, making clear decisions on system trade-offs.* Establish engineering benchmarks for app startup times, memory footprint, and frame rates.Discovery & decisions* Evaluate new mobile technologies, frameworks, and tools to solve complex scale problems before they impact production.* Design and execute migration strategies (including native add-to-app integrations) to modernize legacy codebases seamlessly.* Define and enforce security baselines, including certificate pinning, obfuscation, and anti-tampering logic.Delivery & execution* Contribute hands-on code to critical, high-complexity systems and core framework libraries.* Lead incident response and root-cause analysis for high-severity mobile production issues.* Optimize app performance, diagnosing UI/raster jank, memory leaks, and CPU-heavy operations using Dart Isolates.Stakeholder & cross-team alignment* Partner with Product Managers, Heads of Streams, and Team Leads to align technical roadmaps with product release schedules.* Standardize CI/CD pipelines, release automation (fastlane), and store submission processes across all mobile teams.* Align architectural patterns across cross-functional streams to prevent technical fragmentation.People & technical leadership* Mentor senior and mid-level engineers, running code reviews that raise the overall quality bar.* Support Team Leads in crafting technical Personal Development Plans (PDPs) for mobile engineers.* Drive engineering culture through technical write-ups, architecture reviews, and internal knowledge-sharing sessions.What makes you a GR8 fit:Must-have* 7+ years in commercial software development, with 3+ years dedicated to Flutter/Dart and hands-on experience in native iOS (Swift) or Android (Kotlin).* Strong system design and architectural thinking, paired with deep mastery of Dart internals (isolates, async, null safety) and Flutter's rendering pipeline.* Deep understanding of software engineering best practices, including state management (Bloc or Riverpod), testing (unit, widget, integration), and monorepos (Melos).* Proven ability to balance technical quality vs delivery speed, taking full ownership and accountability for technical decisions and outcomes.* Hands-on experience with high-frequency real-time data handling (WebSockets, long-lived connections, protobuf/JSON serialization) and mobile security standards.* Effective technical communication skills across engineering and non-engineering stakeholders, with an ability to work smoothly in cross-functional environments (Product, Delivery, Ops).* Mentorship and people development mindset, with experience guiding engineers through code reviews, technical roadmaps, and personal development planning.Nice-to-have* Hands-on experience with native add-to-app Flutter integration strategies and incremental migrations.* Experience building CMS-driven or Server-Driven UI frameworks.* Familiarity with dynamic localization, per-market feature toggles, deep linking at scale, and multi-jurisdictional app deployment.* Practical experience profiling mobile app performance (DevTools, Impeller engine, jank diagnosis, memory leak isolation).* Familiarity with App Store / Google Play review requirements for gambling and betting applications.Why you'll love working here:Benefits Cafeteria - annual budget you allocate to:Sports - Medical - Mental health - Home office - Languages.Work-life & support* Paid maternity/paternity leave + monthly childcare allowance.* 20+ vacation days, unlimited sick leave, emergency time off.* Remote-first + tech support + coworking compensation.* Team events (online/offline/offsite).* Learning culture with internal courses + growth programs.Our culture & core values:GR8\\_TECH culture is how we win - through trust, ownership, and a growth mindset. We move fast, stay curious, and keep it real, with open feedback, room to experiment, and a team that's got your back.FUELLED BY TRUST: we're open, honest, and have each other's backs.OWN YOUR GAME: we take initiative and own what we do.ACCELER8: we move fast, focus smart, and keep it simple.CHALLENGE ACCEPTED: we grow through challenges and stay curious.BULLETPROOF: we're resilient, ready, and always have a plan.