Lead Backend Engineer

ZipRecruiter; Miami (FL); Remote; USD 120,000 - 180,000; Full time

Job summary

A well-funded Web3 fintech startup seeks backend engineers to develop real-time financial infrastructure. The role involves architectural development, maintaining APIs, and working with cutting-edge tools. This is a remote-first position with a top-of-market salary, equity, and the chance to shape the future of finance.

Benefits

Top-of-market salary and possible equity

Flexible hours

Remote-first culture

Influence over architecture and roadmap

Collaborative team culture

Qualifications

• 5+ years in backend engineering, focusing on financial systems.
• Strong proficiency in TypeScript, Node.js, and frameworks like NestJS.
• Solid experience with WebSockets and real-time messaging systems.

Responsibilities

• Architect, develop, and maintain real-time APIs and backend systems.
• Build scalable microservices with NestJS and gRPC.
• Manage streaming pipelines with Kafka for high-throughput event data.

Skills

TypeScript

Node.js

Kafka

gRPC

Microservices

WebSockets

Blockchain fundamentals

Docker

Kubernetes

CI/CD

Job description

Job DescriptionJob 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. Theyre not just building APIs theyre 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, were scaling fast and were looking for core engineers to shape what comes next.

What Youll 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

Youll 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- API Gateway

What Were 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- 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 youre passionate about building real-time, decentralized financial infrastructure with an elite engineering team, wed love to meet you.