Lead Backend Engineer

· 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

· 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

· 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.

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.