Lead the Nav iOS SDK team at Mapbox, driving roadmap, mentoring engineers, and shaping rendering and SDK architecture. Requires 3+ years of engineering management and a minimum of 5+ years professional mobile software development experience; professional English (C1) is required. Compensation range listed in USD.

Join Kraken's Consumer engineering team to deliver cross-platform web and mobile experiences using React, React Native and TypeScript. Responsibilities include end-to-end ownership from discovery to production monitoring, driving A/B testing and experimentation, making architecture decisions (Next.js, React Server Components), mentoring engineers, and using AI-assisted development tools. Requires 6+ years experience and strong English communication.

Freelance Senior Android Developer role working remotely (Warsaw-based office optional). Responsibilities include designing, building and maintaining Android apps that communicate with hardware over BLE, writing Kotlin, using Jetpack Compose, applying unit testing/TDD, reviewing code, and using AI tools in the workflow. Initial freelance/time & material engagement (paid by hours); potential path to permanent contract and benefits after ~3 months. English (B2+) required.

Freelance Senior Flutter Developer to deliver cross-platform Flutter apps that interact with firmware and physical devices via BLE (experience with flutter_blue_plus preferred). Fully remote (Warsaw office & Gdansk cowork optional), paid on B2B hourly basis (90–180 PLN/h). Path to permanent contract possible after initial 3 months. Role requires commercial Flutter and Dart experience, platform debugging (iOS/Android), and strong problem-solving and collaboration skills.

Freelance Senior iOS Developer role (fully remote, Warsaw office available). Paid hourly B2B (90–180 PLN/h). Responsibilities: build and maintain iOS apps communicating with BLE hardware, write unit tests (XCTest/Quick/Nimble) with a TDD mindset, maintain CI/CD (GitHub Actions/Bitrise/Travis), review PRs, and collaborate with firmware, design, QA, and PMs. Path to permanent contract possible after initial 3 months.

Join as a freelance Mobile Developer owning the mobile side of connected-product projects (wearables, sensors, health-tech). Design and implement robust BLE communication flows, debug device interactions, and work alongside firmware, backend, design, QA and PMs. Role is fully remote (optional Warsaw/Gdansk offices), paid 90–180 PLN/h B2B, with a path to a permanent contract after a successful initial 3-month period. Recruitment and day-to-day work in English (B2+).

Lead and grow a distributed engineering team responsible for Kraken Pro’s mobile experience. Own technical vision and architecture, build and maintain high-performance React Native apps, improve performance/reliability/scalability, mentor engineers, collaborate with Product/Design/Backend, and lead resolution of critical production issues. 8+ years experience and strong React Native and TypeScript knowledge required.

Responsible for the motion and interaction layer of the Kraken mobile app (React Native). Work includes building and evolving animated components and motion tokens, profiling and optimising rendering performance (especially on lower-end Android), bridging to native when needed, and partnering with product designers to ship refined motion and interaction experiences.

Planner 5D seeks an Android Team Lead with 7+ years of Android experience to own Android development, make technical decisions, mentor developers, and implement complex features (graphics, multiplayer, AI, CRDT). Required skills include Kotlin, Java, Jetpack, Dagger, Coroutines/RxJava, Room/SQLite, REST/Protobuf, testing, and in-app payments. Locations listed include several European cities and Poland.

Role focuses on designing and implementing features for Mapbox's Navigation SDK on Android, defining architecture for cross-functional projects, improving code quality and developer experience, debugging and profiling performance issues, and mentoring teammates. Required experience includes shipping Android apps/SDKs and familiarity with Kotlin and Java; C++ and AOSP experience are noted as pluses. Annual salary range provided: USD 75,000–112,000.