Founding Flutter Engineer for Scalable iGaming Mobile

GR8 Tech group; Polska; Hybrid; PLN 320,000 - 520,000; Full time

Benefits offered by this job

Remote-first

Tech support

Learning budget

Job summary

GR8_TECH builds B2B iGaming platforms powering millions of active players. The role owns frontend mobile architecture across flagship products, delivering high-throughput Flutter apps with low latency and strong engineering standards.

You will mentor engineers, drive migrations, and align roadmaps with product releases in a remote-first setup that supports global teams.

Qualifications

• 7+ years in commercial software development with mobile/backend experience preferred.
• 3+ years dedicated to Flutter/Dart and hands-on iOS/Android experience.

Responsibilities

• Own high-level mobile system architecture for flagship products.
• Define patterns to keep apps stable, modular, and fast.
• Lead incident response and root-cause analysis for mobile production issues.

Job description

GR8_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).

• Proven track record as a Founding Engineer, with hands-on experience designing and architecting large-scale, high-load Enterprise applications from scratch
  (beyond small-scale or multi-page apps).

• Strong history of technical leadership, successfully driving complex mobile products through the full development lifecycle to production deployment.
  

• 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.

• A verifiable portfolio of complex, production-grade applications, where you served as the Primary Architect or Tech Lead.

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.