Kotlin Jobs in Web3

Moonshot is the “Robinhood for DeFi”—an iOS and Android app that lets anyone trade cryptocurrencies on-chain through a user-friendly interface.

Since our launch in July 2024, we’ve attracted 2M+ users.

Our mission: Make moonshots possible for everyone.

Our vision: Make a world where life-changing financial outcomes are within everyone's reach.

Everyone on our team is both a decision-maker and an implementer—united by a sense of urgency and driven by the conviction that our work can transform global finance. If you thrive on curiosity, welcome tough challenges, and aspire to leave a meaningful mark on the world, Moonshot is the place for you. You’ll run toward the hardest problems alongside high-caliber teammates who consistently push each other to excel and who share your dedication to shaping the future of decentralized finance.

This role is full-time, preferably located in NYC. Open to remote for the right candidate.

The Opportunity

As a Senior Mobile Engineer at Moonshot, you’ll lead the next chapter of our iOS and Android trading experience. You’ll own the architecture, design system, and engineering practices for our Flutter app, similar to senior mobile engineers at high-scale fintech and consumer apps. You’ll ship highly interactive, performant trading experiences while building the foundations (testing, analytics, feature flags) that let the entire team move quickly and safely.

What You’ll Do

• Own the architecture and long-term evolution of Moonshot’s Flutter app across iOS and Android.

• Design, implement, and maintain a company-wide mobile design system and component library, in close collaboration with Design.

• Build highly interactive trading experiences: live prices, charts, order tickets, order history, notifications, and portfolio views.

• Drive mobile performance and reliability: profiling, optimizing frame rendering, managing memory/network usage, and minimizing crashes.

• Implement and maintain automated testing (unit, widget, integration) and help define release and QA processes.

• Collaborate with Product and Growth to integrate analytics, A/B testing, feature flags, and event tracking directly into the app.

• Partner with Backend/Platform engineers on API design, data models, error handling, and resilience (retries, fallbacks, offline behaviour).

• Lead by example through code reviews, design docs, and mentorship, raising the bar for mobile excellence.

• Participate in on-call rotations for mobile-related incidents and drive root-cause fixes.

What We Look For in You

• 6–10+ years of professional mobile development, ideally 3+ years of Flutter in production or otherwise React Native, Kotlin, Swift

• Experience owning large-scale consumer apps end-to-end, ideally in fintech, trading, or similarly demanding domains.

• Strong understanding of mobile architectures (state management, navigation, modularization) and their tradeoffs.

• Demonstrated experience building or leading design systems / UI libraries in Flutter or other frameworks.

• Solid engineering fundamentals: testing, CI/CD for mobile, monitoring, and release management.

• Strong collaboration skills and experience mentoring other engineers.

Nice to Haves

• Experience with real-time data (WebSockets/streams) and highly interactive UIs.

• Exposure to growth-focused mobile work: experiment frameworks, deep links, attribution.

• Crypto/DeFi or trading experience, or other high-frequency transactional apps (sports betting, brokerage, etc.).

Location

• NYC preferred (with periodic in-person sprints).

• Remote-friendly within NAMER; travelling ~1wk/qtr

Compensation & Package

• Competitive salary and meaningful equity.

• 5% 401(k) match.

• Health benefits with employer-covered premiums, plus life insurance coverage.

• One-time office setup stipend.

• Flexible PTO.