Senior Software Engineer, Backend (Money Movement)

Phantom is on a mission to connect the world to the freedom of open markets. Tens of millions of people all over the world use Phantom to access global markets that never close, including perpetuals, prediction markets, tokenized assets, stablecoins and memes. Phantom users are able to discover the markets that matter and the cultural moments that shape them, building conviction through real-time data and the verified performance of top traders. With self-custody and access to open networks at its core, Phantom lets them control their financial moves in the same app they use to safely store or spend money worldwide. Phantom has reached #1 in Google Play's finance category and consistently ranks in the top 50 apps across all categories. Phantom partners with many of the most trusted and influential names in finance like Hyperliquid, Stripe, Kalshi and Visa, to make the most popular and innovative financial products accessible to everyone. We are around 180 people, fully remote, backed by a $150M Series C investment from a16z, Sequoia Capital and Paradigm. Responsibilities Staff Backend Engineer who blends systems thinking with product pragmatism and a real passion for crypto. You’ll design, maintain, and evolve the backend services and APIs that connect Phantom Cash to blockchains. You understand both client-server architecture and blockchain protocols, and you know how to balance reliability, quality, and speed. You communicate clearly across pods, document rigorously, and elevate the engineering bar through execution and mentorship. Your work will make Phantom Cash feel dependable, seamless, and ready to scale. Qualifications • Bachelors degree in Computer Science or related technical field or equivalent practical experience • Pragmatic engineering mindset, focuses on results and user impact, not abstract purity. • Proactive and outcome-oriented: anticipates problems, pushes features to completion without waiting for perfect specs. • Strong communicator and pragmatic problem solver - explains complexity simply, favors progress over perfection. • Node.js / NestJS at scale; event-driven design (queues, retries, idempotency). • REST API architecture: versioning, pagination, error models, authentication, rate-limiting. • Full-stack awareness: understands trade-offs of state management (client vs server) and latency budgets. • Distributed-systems fundamentals: concurrency, ordering, retries, data consistency. Nice to Have • Kubernetes + AWS ops; CI/CD; observability; on-call ownership. • Deep interest in crypto - keeps up with ecosystem changes, wallets, protocols, and security norms. • Previous hands-on experience in crypto or fintech (exchanges, wallets, payment rails, ledgers). • Smart-contract and protocol understanding: knows how on-chain programs interact with off-chain services. • Blockchain integration experience — Solana preferred, EVM acceptable. • Has shipped high-quality products in mature, high-bar engineering organizations. Why Work with Us We are a team of experienced builders in the blockchain and crypto industry. Our journey began from users seeking an easy, seamless path to accessing the crypto ecosystem. This passion fueled our exponential growth, allowing us to onboard over 7M+ active users in just over three years; with our user base growing weekly. Our dedication to a secure and seamless user experience has made us the leading wallet on Solana as well as our multi-chain approach enhances our platform's versatility, meeting the needs of a diverse and growing user base. By staying at the forefront of technology and user expectations, we continue to innovate and set industry standards on self-custodial crypto wallets. There has never been a better time to work in crypto to help shape the futur