Mobile Design Engineer

Favia; United Kingdom; Remote; GBP 89,000 - 134,000; Full time

Job summary

Favia is seeking a mobile-focused React Native specialist to own the feel of the Favia app—from instant trade confirmations to smooth charts and responsive sheets. You’ll work across motion, gestures, and transitions, balancing the JS and UI threads to deliver trust through polished UI.

You’ll evolve the mobile design system, collaborate with product designers, and profile rendering on lower-end devices. If you love shaping how a fintech product feels as much as how it works, join us.

Qualifications

• The candidate has a portfolio demonstrating craft in mobile apps.
• Deep React Native fluency with focus on motion and UI responsiveness.
• Experience reading frame timelines and optimizing JS vs UI thread performance.
• Ability to collaborate with designers to elevate motion design.

Responsibilities

• Own the motion and interaction layer of the Favia app, including easing, springs, gestures, transitions, haptics, and sound.
• Evolve the mobile design system and own components used by engineers (gesture handlers, transition primitives, animated containers, motion tokens).
• Partner closely with product designers to elevate motion and interaction design from concept through implementation.
• Profile and optimize rendering performance, especially on lower-end Android devices.
• Contribute to architectural decisions affecting UI responsiveness, state management, render cycles, and data flow into the view layer.
• Raise the bar for what 'great' means by setting patterns and leading by example.

Skills

Portfolio

React Native

Reanimated

Motion design

Performance optimization

English communication

Education

Bachelor's degree in CS

Tools

React Native Skia

Swift/Kotlin bridge

Job description

The Team

The Consumer Mobile team builds the Favia app, the interface millions of people use to interact with their money. We work in React Native and care deeply about how the product feels, not just whether it functions. A trade confirmation should feel instantaneous. A portfolio should feel alive. Navigation should feel effortless. These details directly impact trust, and trust is everything in crypto.

The opportunity

Most companies treat design and engineering as two practices that translate to each other. We're hiring someone who treats them as one craft. The translation step is where most products lose what makes them feel good.

You’ll own the feel of the Favia app: the half-second a trade confirms, the way a chart loads, how a sheet rises from the bottom of the screen and lands where it physically should. On a product where people move their savings, moments like that build trust.

This is a mobile-first role on a React Native codebase. We work in Reanimated and Skia, bridge to native when we need to, and sweat the split between the JS thread and the UI thread.

• Own the motion and interaction layer of the Favia app. Easing, springs, gestures, transitions, haptics, sound. The perceptual surface from cold start to confirmation.

• Evolve the mobile design system. You'll own the components other engineers reach for (gesture handlers, transition primitives, animated containers, motion tokens) and the standards that govern them.

• Partner closely with product designers, challenging and elevating motion and interaction design from concept through implementation

• Profile and optimise rendering performance, especially on lower-end Android devices where frame drops are unforgivable

• Contribute to architectural decisions that affect UI responsiveness: state management, render cycles, and data flow into the view layer

• Raise the bar for what 'great' means across the mobile org by review, by example, and by writing the patterns that make doing the right thing easier than doing the wrong thing.

What you bring

• A portfolio. A demo reel, a personal site, a GitHub of interaction sketches, screen captures of work you've shipped that you're proud of. We don't care which format; we care that we can see your craft.

• Deep React Native fluency. You know Reanimated well enough to argue with people about it. You've fought gesture handlers. You've profiled JS thread vs. UI thread work and won. You can read a frame timeline and tell us where the time went.

• Taste in motion. You have opinions about easing curves. You notice when a spring is over-damped. You can articulate why a transition feels wrong before you know how to fix it.

• Product judgment. You can take a half-formed brief, find the actual problem inside it, and ship something better than what anyone thought to ask for. You shape what the spec should have been rather than wait for it to arrive.

• AI tools as part of how you work. Cursor, Copilot, Claude, whatever your stack is. You use them to move faster on the parts that aren't the craft so you can spend longer on the parts that are.

• Written and verbal English. We're globally distributed and live in docs and async threads.

Nice to have

• React Native Skia, shader work, or custom canvas-based rendering for non-standard UI.

• Real native experience. Enough Swift or Kotlin to write a bridge module, and enough platform knowledge to know when one's the right call.

• A motion library, design-system contribution, or interaction primitive set that other engineers picked up and used.

• A visual or motion design background. You prototype in Figma, After Effects, or on paper before (or instead of) writing code.

• High-stakes product experience in fintech, trading, health, or anywhere UI precision is load-bearing.

Unless a specific application deadline is stated in the job posting, applications are accepted on an ongoing basis.

Please note, applicants are permitted to redact or remove information on their resume that identifies age, date of birth, or dates of attendance at or graduation from an educational institution.

We consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.

Our commitment

We may ask candidates to complete job-related skills or work-style assessments as part of our hiring process. These assessments evaluate competencies relevant to the role and are applied consistently across candidates for similar positions. Results are considered alongside experience and interviews, and are not the sole basis for any employment decision.

As an equal opportunity employer, we don't tolerate discrimination or harassment of any kind, whether based on race, ethnicity, age, gender identity, citizenship, religion, sexual orientation, disability, pregnancy, veteran status, or any other protected characteristic as outlined by federal, state, or local laws.