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Our client is a well-funded Web3 fintech startup redefining the future of real-time financial infrastructure. Our platform bridges traditional finance and decentralized systems, enabling seamless, secure, and transparent access to blockchain-powered financial services. They're not just building APIs - they're creating the data rails for the decentralized economy, supporting everything from real-time transaction monitoring to decentralized asset management. With deep backing from top VCs and a founding team of fintech and blockchain veterans, we're scaling fast - and we're looking for core engineers to shape what comes next.
What You'll Do
· Architect, develop, and maintain real-time APIs and backend systems powering crypto trading, DeFi analytics, and digital asset tracking.
· Build scalable microservices with NestJS and gRPC, and design APIs used by developers, trading platforms, and financial institutions.
· Manage streaming pipelines with Kafka to process high-throughput event data from blockchains and financial markets.
· Implement WebSocket-based services using Bun to push live updates (price feeds, wallet events, smart contract logs).
· Store and optimize time-series data using QuestDB for hot access and ClickHouse for long-term analytics and compliance reporting.
· Secure and orchestrate APIs through APISIX, with features like rate limiting, authentication, and request transformation.
· Contribute to infrastructure scalability, observability, and resilience in a mission-critical, high-uptime environment.
· Collaborate with smart contract developers, frontend engineers, and data scientists to ship features end-to-end.
The Tech Stack
You'll be working with bleeding-edge tools purpose-built for real-time finance:
· NestJS - Modular TypeScript backend framework
· gRPC + Protobuf - Blazing fast internal service communication
· Kafka - Event streaming for blockchain and financial data ingestion
· Bun - Ultra-fast runtime for high-frequency WebSocket communication
· QuestDB - Low-latency time-series database for recent data
· ClickHouse - Scalable analytics database for long-term storage
· APISIX - Cloud-native API Gateway
What We're Looking For
· 5+ years in backend engineering, ideally with a focus on financial systems or high-throughput platforms
· Strong proficiency in TypeScript, Node.js, and frameworks like NestJS
· Experience with event-driven architecture and tools like Kafka
· Comfort working with gRPC, Protocol Buffers, and microservices
· Knowledge of blockchain fundamentals, smart contracts, or Web3 APIs (e.g., Ethers.js, Web3.js) is a big plus
· Solid experience with WebSockets and real-time messaging systems
· Proven ability to design and optimize time-series data solutions
· Familiarity with cloud-native infrastructure (Docker, Kubernetes, CI/CD pipelines)
· Security-first mindset - especially around financial and cryptographic systems
· Self-starter attitude, with the ability to thrive in a fast-moving startup environment
What They Offer
· Top-of-market salary + possible equity + crypto bonuses
· Remote-first, async-friendly culture with flexible hours
· The chance to work on the cutting edge of finance and Web3
· A technical leadership role with influence over architecture and roadmap
· Collaborative, transparent team culture with real ownership
Join the Future of Finance
If you're passionate about building real-time, decentralized financial infrastructure with an elite engineering team, we'd love to meet you.
Lead Backend Engineer • Miami, FL, USA
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