Job VC

We are looking for a Senior Flutter Engineer with strong Bluetooth Low Energy (BLE) experience to join our client's team in a long-term contract engagement. This is a fully remote opportunity to build the core software layer powering a smart locker platform used by enterprise and public sector organisations.

You will take ownership of a Flutter/Dart SDK that acts as the bridge between mobile applications, cloud services, and physical smart locks. The SDK abstracts complex BLE communication, authentication flows, token management, and server interactions behind a clean, high-level API used by partner applications.

This role is ideal for an engineer who enjoys solving real-world connectivity challenges, working close to hardware and firmware systems, and building robust SDKs that operate reliably across diverse mobile environments.

Key Responsibilities:

Design, develop, and maintain a Flutter/Dart SDK used by partner applications to interact with smart locker infrastructure
Implement BLE scanning, lock discovery, and device identification across iOS and Android platforms
Manage BLE connection lifecycles, including reconnection strategies, timeout handling, and device-level edge cases
Build and maintain secure authentication and encrypted token exchange workflows between mobile applications and physical locks
Implement token sequencing, refresh mechanisms, and rolling token buffer management for allocated lockers
Integrate with backend services through REST APIs to support locker allocation, availability checks, token issuance, and session validation
Handle race conditions and real-world concurrency scenarios between multiple apps, users, and physical access methods
Collaborate closely with firmware engineers to implement and validate communication protocols and authentication sequences
Ensure SDK reliability, maintainability, performance, and developer-friendly API design

Requirements:

5+ years of commercial Flutter/Dart development experience
Strong experience building and shipping production mobile applications
Proven hands-on experience working with Bluetooth Low Energy (BLE) in real-world environments
Deep understanding of BLE concepts including GATT services, characteristics, device discovery, connection management, and platform-specific behaviours
Experience supporting BLE functionality across both iOS and Android
Solid understanding of REST API integration and asynchronous application architecture
Experience working with secure storage, authentication flows, and token-based systems
Strong debugging and problem-solving skills, particularly around connectivity issues and device-level edge cases

Nice to Have:

Experience building and maintaining Flutter packages or SDKs
Background in IoT, smart devices, access control, or hardware-integrated applications
Familiarity with cryptography, encryption protocols, and secure communication patterns
Experience collaborating with embedded or firmware engineering teams
Knowledge of mobile platform internals related to Bluetooth and background processing
Experience designing public-facing APIs for external developers

What We Offer:

Fully remote engagement with flexible working arrangements
Opportunity to build a core product used by enterprise and public sector customers
Challenging technical work involving mobile, cloud, BLE, security, and hardware integration
High level of ownership and autonomy with direct impact on product architecture
Collaborative engineering environment with close interaction between mobile, backend, and firmware teams
Competitive compensation based on experience and expertise

How to Apply:

Send us a short intro about yourself and your relevant experience - and tell us your favourite ice cream flavour (ours is cherry🍒)