Kotlin Jobs in Web3

About the Company

Rain makes the next generation of payments possible across the globe. We’re a lean and mighty team of passionate builders and veteran founders. Our infrastructure makes stablecoins usable in the real-world by powering card transactions, cross-border payments, B2B purchases, remittances, and more. We partner with fintechs, neobanks, and institutions to help them launch solutions that are global, inclusive, and efficient. You will have the opportunity to deliver massive impact at a hypergrowth company that is funded by some of the top investors in fintech, crypto, and SaaS, including Sapphire Ventures, Norwest, Galaxy Ventures, Lightspeed, Khosla, and several more. If you’re curious, bold, and excited to help shape a borderless financial future, we’d love to talk.

Our Ethos

We believe in an open and flat structure. You will be able to grow into the role that most aligns with your goals. Our team members at all levels have the freedom to explore ideas and impact the roadmap and vision of our company.

About the Team

You'll be the lead Adnroid engineer at Rain, owning mobile alongside the lead iOS developer from the ground up. Our partners use Rain's issuance platform and APIs to power card programs, wallets, and payment experiences for their end users, and you'll be the person who brings those experiences to life on iOS. You'll work directly with product, design, and our platform engineering team to define what great mobile looks like for Rain's clients and their customers.

What you’ll do

• Own the entire Android development lifecycle, from architecture and implementation to Play Store delivery

• Build polished, production-grade mobile apps that leverage Rain's issuance platform and APIs for clients and their end users

• Collaborate closely with product, design, and backend engineers to define the mobile roadmap and translate platform capabilities into intuitive native experiences

• Architect a clean, scalable codebase that can serve as the foundation as the mobile team grows

• Integrate with Rain's APIs for card issuance, transaction management, balance queries, and other payment flows

• Implement secure authentication, tokenization, and data handling appropriate for a financial services context

• Drive decisions on tooling, frameworks, CI/CD, and testing strategy for mobile

• Contribute to the broader engineering culture as an early team member with outsized influence on how we build

You are likely to succeed if you have:

• 4–10 years of professional mobile development experience, with multiple apps shipped to the App/Play Store

• Proficiency in Kotlin and deep familiarity with modern Android frameworks (Jetpack Compose, Coroutines, Hilt/Dagger, Room, Navigation, etc.)

• Experience architecting Android apps from scratch. You've made foundational decisions on project structure, navigation patterns, state management, and dependency injection

• Solid understanding of networking layers, RESTful API integration, and secure data handling

• A disciplined approach to code quality: you write testable code, value code review, and care about maintainability

• Comfort working autonomously with minimal direction — you'll be the mobile expert in the room

• Strong product sensibility: you think beyond tickets and advocate for great user experiences

• Excellent communication skills; you can translate technical tradeoffs for non-technical stakeholders

Bonus attributes:

• Experience in fintech, payments, or crypto/web3

• Familiarity with card issuance, wallet UX, or financial transaction flows

• Experience with WebView-based hybrid architectures or embedded SDK patterns

• Exposure to CI/CD tooling for Android (Gradle, GitHub Actions, Bitrise, Firebase App Distribution, etc.)

• Experience with Kotlin Multiplatform (KMP) for shared business logic

• Experience being the first or early mobile hire at a startup
  

Things that enable a fulfilling, healthy and happy experience at Rain:

Unlimited time off 🌴Unlimited vacation can be daunting, so we require Rainmakers to take 10 days minimum for themselves.

Flexible working ☕ We support a flexible workplace, if you feel comfortable at home please work from home. If you’d like to work with others in an office feel free to come in. We want everyone to be able to work in the environment in which they are their most confident and productive selves. New Rainmakers will have a stipend to create a comfortable atmosphere at home.

Easy to access benefits 🧠For US Rainmakers, we offer comprehensive health, dental and vision plans for you and your dependents, as well as a 100% company subsidized life insurance plan.

Retirement goals💡Plan for the future with confidence. We offer a 401(k) with a 4% company match.

Equity plan 📦 We offer every Rainmakers an equity option plan so we can all can benefit from our success.

Rain Cards 🌧️ We want Rainmakers to be knowledgeable about our core products and services. To support this mission, we issue a card for our team to utilize the card for testing.

Health and Wellness 📚 High performance begins from within. Rainmakers are welcome to use their card for eligible health and wellness spending like gym memberships/fitness classes, massages, acupuncture - whatever recharges you!

Team summits ✨ Summits play an important role at Rain! Time spent together helps us get to know each other, strengthen our relationships, and build a common destiny. Expect team and company offsites both domestically and internationally.

Compensation Range: $201,377 - $252,789