Mobile App Developer

ZOLLARO, Inc.; Greater London; Hybrid; GBP 50,000 - 90,000; Full time

Benefits offered by this job

Learning & development budget

Paid annual leave + holidays

Flexible working hours

Fully remote role

Job summary

ZOLLARO, Inc. is seeking a Mobile App Developer to build and maintain high-performance iOS and Android apps used by millions tracking health metrics. You will own feature areas from architecture to production release, collaborating with design, backend, and data science teams to ship intuitive, reliable experiences.

The role emphasizes performance optimization, REST/WebSocket integration, and state management, with fully remote work and a learning budget to support conferences and courses.

Qualifications

• 3–5 years of experience building production mobile applications with React Native or native iOS/Android.
• Solid understanding of mobile performance optimisation — rendering, memory, battery impact.
• Experience integrating with REST APIs and WebSocket streams.
• Familiarity with App Store and Google Play submission, review, and release processes.
• Experience with state management (Redux, Zustand, or equivalent).
• Good instincts for UX and attention to pixel-level design fidelity.
• Bonus: HealthKit, Google Fit, or BLE device integration.

Responsibilities

• Own entire feature areas across the mobile app from architecture decisions to production release.
• Collaborate with product designers, backend engineers, and data scientists to ship performant features.
• Maintain high code quality with automated tests and contribute to internal component library.
• Deliver a consumer product used by millions in health journeys.

Skills

React Native

iOS

Android

REST APIs

WebSocket streams

state management

HealthKit integration

Google Fit integration

BLE device integration

UX fidelity

Education

Bachelor's Degree in Computer Science or related field

Tools

Redux

Zustand

App Store Deployment

Job description

Build and maintain high-performance iOS and Android apps that help millions of people take control of their health.

Job Description

As a Mobile App Developer at ZOLLARO, you will be at the heart of our mission — engineering the iOS and Android experiences used daily by people tracking their nutrition, fitness, sleep, and wellness. You will collaborate closely with product designers, backend engineers, and data scientists to ship features that feel intuitive, performant, and reliable.

You'll take ownership of entire feature areas across the ZOLLARO mobile app, from initial architecture decisions to production release. Our mobile product is our primary user touchpoint — we expect the same quality bar you'd hold for your own personal projects.

You will work in a fast-moving environment with short release cycles, strong automated testing, and direct feedback from users. You'll also contribute to our internal component library and tooling to accelerate development across the team.

What you’ll bring

• 3–5 years of experience building production mobile applications with React Native or native iOS/Android.
• Solid understanding of mobile performance optimisation — rendering, memory, battery impact.
• Experience integrating with REST APIs and WebSocket streams.
• Familiarity with App Store and Google Play submission, review, and release processes.
• Experience with state management (Redux, Zustand, or equivalent).
• Good instincts for UX and attention to pixel-level design fidelity.
• Bonus: experience with HealthKit, Google Fit, or BLE device integration.
• Fully remote role with flexible working hours.
• Work directly on a consumer product used by real people in their daily health journeys.
• Learning and development budget for conferences, courses, and certifications.
• Paid annual leave + government holidays.
• Collaborative, no-ego team culture with regular design and engineering syncs.
• Competitive compensation reviewed annually.

Bachelor's Degree in Computer Science, Software Engineering, or related field

Key Skills

React Native TypeScript iOS Android REST APIs App Store Deployment