Mobile UI​/Design Engineer

Location

United Kingdom;
Brazil;
Canada;
Cyprus;
Czech Republic;
Germany;
Ireland;
Lithuania;
Mexico;
Poland;
Portugal;
Romania;
Spain;
Switzerland;
United Arab Emirates

Full time

Remote

Engineering, Frontend, Mobile

• Most mobile engineers can build screens. This role is for someone who makes interfaces feel right — the weight of a gesture, the timing of a transition, the moment a loading state becomes invisible. You obsess over these details not because a designer asked for them, but because you can't ship something that feels wrong.

  • Own the craft layer of our React Native mobile experience — fluid, gesture-driven interactions and transitions that feel native, not web‑in‑a‑wrapper

  • Push React Native beyond its defaults — Reanimated, Skia, native module bridges when the abstraction isn't enough

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

  • Establish animation primitives and interaction patterns within our design system that other engineers build on — your work becomes the quality floor for the team

  • 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

  • Mentor engineers on interaction quality and raise the standard for what “done” looks like across the mobile org

• Deep, demonstrable experience building polished mobile interfaces in React Native — you know Reanimated well, you've fought with gesture handlers, and you've profiled JS thread vs UI thread performance and won

• A trained eye for interaction design — you notice when an easing curve is wrong, you have opinions about spring physics, and you understand that 60fps isn't a target, it's a constraint

• A portfolio or demo reel of shipped work is a hard requirement — a personal site, video walkthrough, Git Hub interaction demos, or screen captures of work you're proud of. If we can't see your craft, we can't evaluate it

• Experience with modern AI development tooling (Cursor, Copilot, or similar) as a natural part of how you build — not as a novelty, but as a multiplier

• Strong written and verbal communication skills in English

• Experience with React Native Skia, custom shader work, or canvas‑based rendering for non‑standard UI

• Some native platform knowledge (Swift/Kotlin) for when you need to drop below the RN abstraction — bridging, native modules, platform‑specific behaviour

• You've built interaction patterns that other engineers adopted — shared animation libraries, gesture primitives, motion design systems

• Background in or affinity for visual/motion design — maybe you prototype in Figma or After Effects before you write code, maybe you sketch interaction flows on paper. Either way, you think visually

• Experience in high‑stakes product domains (fintech, health, trading) where UI precision affects user trust

• Strong opinions, loosely held — you push back on designs that won't translate well to mobile and advocate for the user's experience, but you also know when to ship and iterate

Unless a specific Final date to receive applications 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.

Kraken is powered by people from around the world and we celebrate all Krakenites for their diverse talents, backgrounds, contributions and unique perspectives. We hire strictly based on merit, meaning we seek out the candidates with the right abilities, knowledge, and skills considered the most suitable for the job. We encourage you to apply for roles where you don't fully meet the listed requirements, especially if you're…