(Remote) Senior Unity Developer (Mobile & UI Systems)

Immerse•Costa Mesa, CA

82d•Remote

About The Position

About Immerse Immerse is building the enterprise platform for Fluency Performance, helping language learners around the world communicate with confidence when it matters most. Our interdisciplinary team of designers, developers, and language experts builds immersive experiences that connect language learning to measurable business outcomes. Why this role exists Our product spans multiple surfaces (desktop, VR, and mobile), and UI is a core part of how learners succeed. We’re hiring a senior UI engineer who will contribute broadly across UI implementations while bringing a strong mobile-first skillset to the team: responsive layout discipline, real-device performance instincts, and production-grade API-driven UI patterns. You’ll be expected to own outcomes, make sound tradeoffs, and collaborate tightly with Design, Product, and Education teams to ship polished, resilient UI that holds up in production. What you will ship in your first 90 days You will own and ship multiple production Unity UI screens and flows end-to-end, including: Implementing designs from Figma in Unity uGUI with extendable architecture Integrating with backend REST APIs, including async loading, empty, error states, retries, and cancellation Profiling and fixing UI performance issues on real desktop, VR, and mobile devices Shipping, measuring impact, and iterating post-launch based on analytics + customer/internal feedback You’ll also contribute to shared UI patterns that benefit our broader surfaces (desktop/VR), using mobile discipline to raise the bar for performance and reliability everywhere. What this role is focused on We are looking for someone who consistently demonstrates: End-to-end ownership of complex, API-driven UI flows in production Strong judgment under constraints (prioritization, tradeoffs, risk management) Clear communication with designers and product partners, including crisp handoffs and async walkthroughs Production-minded engineering habits (maintainability, debuggability, reviewability) A performance-first mindset on real devices (not just in-editor) Primary emphasis: Unity UI (uGUI): Canvas, RectTransform, Layout Groups, TextMeshPro Mobile-first responsive layout: portrait constraints, safe areas, varying aspect ratios and resolutions REST-driven UI: auth-aware flows, async state management, backend failure modes Lifecycle-safe async: stale-response protection, request cancellation on navigation, deterministic state transitions Large data UI patterns: pooling/virtualization, incremental rendering, placeholder/skeleton states Performance ownership: layout rebuilds, overdraw, draw calls, allocations/GC, memory UI architecture that scales: navigation, composition, reusable components, clean boundaries between UI and data Practical testing fundamentals: Unity Test Framework basics for UI logic/state handling Cross-functional iteration loops: partner with Product + Design to improve shipped experiences

Requirements

Highly organized and capable of organizing others
8+ senior-level experience shipping production software, including 3+ years owning Unity UI systems/front-end engineering (or equivalent experience)
Shipped and maintained at least one production Unity application with real users
Strong mobile Unity context (iOS/Android) and evidence of mobile-first UI discipline
Clear evidence of end-to-end ownership of Unity UI screens/flows (not only small pieces of features)
Deep uGUI expertise and the ability to debug layout behavior confidently
Strong C# fundamentals with production-minded habits: maintainability, null-safety, error handling, reviewability
Experience with async API-driven UI: loading/error/empty states, retries, cancellation, and backend failure modes
Hands-on performance profiling and optimization experience for UI on real devices
Strong cross-functional collaboration skills with designers and product partners
Clear, proactive communication across disciplines and levels; highly organized and able to help organize others

Nice To Haves

Design-system-driven component libraries (theming, typography, spacing, token-driven approaches — i.e., a shared source of truth for design values)
Deeper localization or accessibility expertise
Analytics instrumentation experience (funnels, drop-off, task success)
Cross-platform experience (desktop or VR)
Comfort with modern developer tooling, including AI-assisted workflows, used responsibly
Appreciation of puns (or at least the ability to groan at them)

Responsibilities

Own delivery of key UI screens and flows end-to-end: discovery, implementation, integration, edge cases, release readiness, and iteration
Translate Figma designs into production-ready uGUI with stable layout behavior across devices/resolutions
Build API-driven flows with robust UI states: loading, error, empty, partial data, retries, cancellation, and resilient error handling
Profile and improve UI performance on lowest supported devices (layout rebuilds, overdraw, draw calls, allocations/GC, memory)
Establish maintainable UI patterns that support rapid iteration (state management, navigation, composition, reuse)
Partner closely with Designers and Product Managers to clarify intent, surface edge cases, propose tradeoffs, and align scope early
Contribute to and maintain UI development documentation (patterns, tokens, performance guidelines, review practices)
Mentor other Unity engineers through reviews/pairing, raising quality and consistency across UI work
Keep informed on the market landscape and stay ahead of industry trends to ensure development workflows and design implementations remain competitive and innovative in the application space