Mobile App Developer 3

myenergi; Grimsby; On-site; GBP 50,000 - 70,000; Full time

Job summary

A progressive renewable energy company in Grimsby seeks a Senior React Native Software Engineer to join its mobile team. The role involves developing customer-facing and installer-focused apps, integrating with Bluetooth APIs, and collaborating with product owners and engineers. The ideal candidate has over 5 years of React Native experience and strong skills in JavaScript and TypeScript. This position offers a positive work environment and comprehensive benefits.

Benefits

Free charging of electric vehicles on site

Private Medical Insurance

Cycle to Work Scheme

25 days holiday increases with service + Bank Holidays

Mental Health First Aiders

Career Development & Encouragement

Employee Empowerment

Free onsite parking

Positive working environment

EV salary sacrifice scheme

Birthday Leave

Long service awards

Enhanced maternity & paternity pay

Employee Assistance Programme

Qualifications

• 5+ years using React Native in production apps.
• Strong skills in JavaScript and TypeScript.
• Experience building and maintaining cross-platform mobile apps (iOS and Android).
• Familiarity with BLE integrations in React Native or willingness to learn.
• Experience integrating RESTful APIs and handling asynchronous data flows.
• Version control with Git and familiarity with standard CI/CD processes.
• Experience delivering clean UIs and user experience best practices.
• Good communication skills and a collaborative mindset.

Responsibilities

• Build, maintain, and iterate on our two React Native mobile apps for iOS and Android.
• Help review, design, and implement the architecture of our mobile apps.
• Work closely with product owners, designers, firmware engineers, and QA to deliver features from concept to release.
• Integrate with Bluetooth APIs to support device configuration via the installer app.
• Collaborate on API integration for real-time energy data, settings management, and device control.
• Write robust, maintainable, and well-tested code.
• Identify and resolve performance bottlenecks, bugs, and UI/UX inconsistencies.
• Participate in regular code reviews and help shape best practices.

Skills

React Native

JavaScript

TypeScript

Bluetooth Low Energy (BLE)

RESTful APIs

Git

UI/UX best practices

Communication

Tools

Jest

CircleCI

Job description

Putting the ‘i’ back into British Innovation

Putting the ‘i’ into Inventing the Future

Putting the ‘i’ into Inspiring the Nation

myenergi Ltd is a progressive and innovative company with its HQ born and based right here in Stallingborough, subsidiaries based in Germany, Benelux, Northern Ireland, Australia and ambitions to open facilities right across the world. We specialise in the design and manufacture of ground-breaking renewable‑energy technology products.

We’re looking for a Senior React Native Software Engineer to join our growing mobile team. You’ll help develop and maintain two key mobile apps:

• A customer-facing app that gives users real-time visibility and control over their myenergi devices (zappi, eddi, libbi, harvi, etc.).
• An installer-focused app used by professional installers to connect to our devices via Bluetooth for setup, configuration, and diagnostics.

You’ll work as part of a small, agile team with real ownership over product features and UX improvements. This is an opportunity to work on meaningful software that integrates closely with custom hardware and contributes to a more sustainable future.

Responsibilities:

• Build, maintain, and iterate on our two React Native mobile apps for iOS and Android.
• Help review, design and implement the architecture of our mobile apps.
• Work closely with product owners, designers, firmware engineers, and QA to deliver features from concept to release.
• Integrate with Bluetooth (BLE) APIs to support device configuration via the installer app.
• Collaborate on API integration for real‑time energy data, settings management, and device control.
• Write robust, maintainable, and well‑tested code.
• Identify and resolve performance bottlenecks, bugs, and UI/UX inconsistencies.
• Participate in regular code reviews and help shape best practices across the mobile team.

Qualifications & Experience:

• 5+ years using React Native in production apps.
• Strong skills in JavaScript and TypeScript.
• Experience building and maintaining cross‑platform mobile apps (iOS and Android).
• Familiarity with Bluetooth Low Energy (BLE) integrations in React Native (or willingness to learn).
• Experience integrating RESTful APIs and handling asynchronous data flows.
• Version control with Git and familiarity with standard CI/CD processes (e.g. CircleCI).
• Experience delivering clean UI’s and user experience best practices.
• Good communication skills and a collaborative mindset.

Nice to Have:

• Experience working with native modules (Swift, Kotlin).
• Familiarity with BLE libraries.
• Testing tools like Jest.
• Previous experience in IoT, smart home, or hardware‑connected apps.
• Understanding of energy systems or EV charging tech.

What myenergi offer you:

• Free charging of electric vehicles on site.
• Private Medical Insurance
• Cycle to Work Scheme
• 25 days holiday increases with service + Bank Holidays
• Mental Health First Aiders across the business, let's be there for each other
• Career Development & Encouragement
• Employee Empowerment
• Free onsite parking
• Positive working environment
• EV salary sacrifice scheme
• Birthday Leave – because everyone deserves a day off for their birthday, right?
• Long service awards
• Enhanced maternity & paternity pay
• Employee Assistance Programme - a free 24/7 UK‑based counselling helpline.

myenergi is committed to being an equal opportunity, diverse and inclusive employer. We want a supportive and inclusive environment where our colleagues can reach their full potential without prejudice and discrimination. We are committed to a culture where respect and understanding is fostered, and the diversity of people’s backgrounds and circumstances will be positively valued.