Lead Backend Engineer

Job Description Job Description Octagon Talent Solutions is a full-service technology recruitment and staffing company based in South Florida. We humanize technical recruitment by identifying candidates' long-term career goals and assessing cultural fit when presenting opportunities. Our focus on long-term relationships helps ensure placements that last.

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.