Senior Full Stack Mobile Engineer (Web3 & Fintech)
The Mission
Crush Rewards is building the ultimate bridge between traditional consumer behavior and the decentralized future. We're not just another rewards app; we're a contribution network where everyday actions-like scanning a receipt and linking credit card spending-are transformed into on-chain value.
We are looking for a Full Stack Mobile Engineer who thrives at the intersection of high-performance mobile interfaces, robust backend architecture, and the Solana blockchain. You will own features end-to-end: from crafting a "buttery-smooth" UI to architecting the backend pipelines that verify financial data and trigger token emissions.
What You'll Do
- Architect the Frontend: Lead the development of our React Native (Expo) app, ensuring high-performance execution of complex features like real-time token charts and deep-linked wallet interactions.
- Build Robust Backend Pipelines: Own the Node.js/Express API that powers our ecosystem. You'll manage critical backend logic including receipt OCR verification, transactional syncs with credit cards, product rewards calculations, and user progression systems (streaks, levels, milestones).
- Execute Web3 Strategy: Implement and scale our Solana integration. You will manage custodial wallet flows with Crossmint, execute on-chain token swaps via Jupiter, and handle complex staking/unstaking logic.
- Own the Data Lifecycle: Manage a scalable PostgreSQL architecture, ensuring real-time data consistency across user profiles, streaks, and transaction histories.
- Iterate with Quality: Advocate for best practices in TypeScript, automated testing, and CI/CD (EAS/GitHub Actions) to ensure we ship high-quality code to the App Store and Play Store multiple times a week.
- Drive Growth through Data: Use PostHog analytics and OneSignal engagement tools to understand user behavior and build the features that keep our users "Crushing" their goals.
What You'll Need
- The TypeScript Professional: You have 4+ years of experience in professional software engineering, with a mastery of TypeScript across the entire stack.
- Mobile Expertise: Deep experience with React Native (Expo). You understand the mobile lifecycle, performance optimization, and how to build responsive UIs using modern toolkits.
- Backend Proficiency: Strong experience with Node.js and PostgreSQL. You know how to design clean APIs and manage complex relational data at scale.
- Web3 Literacy: You are comfortable with the Solana ecosystem (web3.js, SPL tokens). You understand how to interact with smart contracts and manage the security implications of blockchain transactions.
- Fintech Experience: Practical experience integrating third-party financial APIs and handling sensitive user data with a "security-first" mindset.
- Product Intuition: You care about the "Why" behind a feature. You can translate a Figma design into a functional reality while suggesting improvements to the user flow. Bonus points if you can create clean UI components without Figma.
Our Tech Stack
- Mobile: React Native, Expo, TypeScript.
- Backend: Node.js, Express, PostgreSQL, Edge Functions.
- Blockchain: Solana (Web3.js), SPL Tokens, Crossmint, Jupiter SDK.
Bonus Points
- You've built or contributed to a Solana Anchor program (Rust) and/or typescript SDKs.
- Experience with AI/LLM pipelines for data extraction or personalized user experiences.
- Background in a high-growth startup where you wore multiple hats and "owned" the outcome.
- A passion for the "Rewards" space and an understanding of gamification mechanics (streaks, levels, milestones).
Why Join Us?
At Crush Rewards, we're a small, focused team where every member has significant impact and ownership. You won't just be a "cog in the machine"-you will be the architect of a platform that redefines how millions of people interact with their money and the blockchain. We value clean code, fast iteration, and a relentless focus on the user experience.
When applying, mention the word CANDYSHOP to show you read the job post completely.About Crush
Crush is an innovative company operating within the dynamic blockchain industry, committed to unlocking new possibilities and driving the future of decentralized technology. We are passionate about developing robust, secure, and user-centric solutions that address real-world challenges and empower individuals and businesses in the digital economy. Our mission is to build foundational infrastructure and applications that foster transparency, efficiency, and trust. While our operations are primarily remote, we maintain a strong presence, particularly in the Oregon, USA region, fostering a collaborative and forward-thinking environment. At Crush, our culture is built on a foundation of intellectual curiosity, continuous learning, and mutual respect. We champion an environment where diverse perspectives are valued, and every team member is encouraged to contribute innovative ideas and take ownership of their work. We believe in empowering our people through autonomy, providing the resources and flexibility needed to thrive both personally and professionally. Our remote-first approach attracts talent from across the globe, uniting individuals who are deeply committed to pioneering advancements in blockchain. Joining Crush means becoming part of a pioneering team at the forefront of a transformative industry. We offer exciting opportunities for professional growth, challenging projects, and the chance to make a significant impact. If you are driven by innovation, eager to push boundaries, and ready to shape the next generation of digital solutions, explore our open positions. Come build the future with us.
Ready to Apply?
To submit your application for this position, please visit Crush's official website and follow their application process.