Mobile Developer (BLE, Flutter/iOS/Android) – Freelance

About the role

We are looking for a Mobile Developer with strong BLE experience to join our remote team on a freelance, time‑and‑material basis. You will work on connected‑product projects such as wearables and health‑tech devices, collaborating directly with clients and cross‑functional engineers.

Key responsibilities

• Own the mobile side of BLE‑enabled product projects from design to delivery.
• Design, implement and test Bluetooth Low Energy communication flows that work reliably in real‑world conditions.
• Debug device interactions, including edge‑case scenarios that occur on specific phones.
• Collaborate closely with firmware, backend, design, QA and product teams.
• Contribute to architectural decisions and technical direction.
• Communicate directly with clients without layers of management.
• Leverage AI tools as part of daily development workflow.

Required profile

• Proven experience building mobile apps that communicate with BLE devices.
• Self‑motivated, comfortable working fully remote with flexible hours.
• Curious and proactive in solving hard technical problems.
• Willing to engage directly with clients and take ownership of deliverables.

Required skills

• BLE (Bluetooth Low Energy) communication.
• Flutter development.
• iOS development with Swift.
• Android development with Kotlin.

What we offer

• Freelance contract paid for actual hours worked on client projects.
• Potential path to a permanent position with full benefits based on performance and business needs.
• Fully remote work environment with optional coworking spaces in Warsaw and Gdańsk.
• Flexible working hours, typically 10:00‑18:00 CET, with occasional evening calls for US clients.