Mobile App Developer

Believ: ABOUT US

At Believ, formerly known as Liberty Charge, we believe sustainable transport should be accessible to everyone. We’re a Charge Point Operator (CPO) on a mission to create the UK’s most reliable electric vehicle charging network that doesn’t cost the earth and leaves no one behind.

We work closely with local authorities and businesses to deliver reliable, high quality charging networks at pace, at scale and at zero cost. We offer all the advantages of being a scale-up business, but with the added security and long-term backing from well‑known parents - Liberty Global (who also own our delivery partner, Virgin Media O2) and Zouk Capital (who manage the Government’s Charging Investment Infrastructure Fund).

You’ll be joining this exciting journey at the start of our scale‑up phase, and work with us to hit the ambitious targets our shareholders have set.

We are seeking an experienced Mobile App Engineer to develop and optimise our customer‑facing mobile application and web portal as part of our in‑house Charge Point Management System (CPMS). Reporting into the Head of Engineering, this role will be responsible for enhancing the app and web portal, which are 70% production‑ready, to achieve feature parity with the incumbent SaaS solution. Following the migration, the focus will shift to building innovative features and capabilities to deliver a market‑leading experience for both Android and iOS users.

• Develop and maintain high‑quality native mobile applications for iOS and Android using Swift and Kotlin.

• Optimize mobile apps for speed, memory usage, and battery efficiency.

• Work with REST/Graph
  
  QL APIs developed in FastAPI for real‑time data synchronization.

• Collaborate with cross‑functional teams to align app features with CPMS functionalities, including the integration of OCPP/OCPI protocols.

• Write and maintain automated tests to ensure application stability and quality.

At Believ, we are building a culture that attracts and retains the best talent. We are a dedicated and high‑performing team, accustomed to working at pace in an ever‑evolving industry, and we are looking for people who are as passionate as us about cutting carbon emissions and providing cleaner air for all. The successful candidate will have the following attributes and skills.

• Proven experience developing and launching mobile applications for iOS and Android.
• Familiarity with mobile performance profiling tools and debugging techniques.
• Experience with backend integration for real‑time data syncing.
• Knowledge of Agile development processes and version control tools like Git.

• Ability to understand and consider the broader business context and long‑term implications of technical decisions.
• Willingness to take ownership, innovate, and proactively seek opportunities to drive impact beyond immediate tasks.
• Strong focus on delivering solutions that align with business goals and address real‑world challenges effectively.
• Commitment to delivering exceptional user experiences by prioritising customer needs and feedback throughout the development process.
• Demonstrate enthusiasm, resilience, and a can‑do approach to tackling challenges and driving success.

• Proficiency in Swift (iOS) and Kotlin (Android).
• Strong experience in API integration and backend technologies such as Python and FastAPI.
• Familiarity with containerised backend environments using Docker.
• Strong problem‑solving and debugging skills.
• Knowledge of cross‑platform optimisation techniques.

• Competitive salary and bonus scheme
• 25 days’ annual leave, plus the usual 8 UK Bank Holidays and the option to purchase up to 5 additional days per year*
• Access to wellbeing and mental health benefits such as the Calm app, personal medical insurance, critical illness cover, dental, optical & travel insurance, income protection and life assurance
• Pension contribution matched up to 10%
• Access to our car benefit scheme and cycle to work scheme
• Access to our online learning platform to…