Lead Elixir Platform Engineer

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

Job summary

A well-funded Web3 fintech startup is seeking a Core Engineer to design and develop real-time APIs and backend systems for crypto trading and DeFi analytics. This role offers an opportunity to work at the forefront of decentralized finance, shaping the architecture and driving innovation in a collaborative team culture. Candidates should have a strong background in TypeScript, Node.js, and experience with high-throughput financial platforms.

Benefits

Top-of-market salary + possible equity + crypto bonuses

Remote-first, async-friendly culture with flexible hours

Technical leadership role with influence over architecture

Collaborative and transparent team culture

Qualifications

• 5+ years in backend engineering, ideally with financial systems focus.
• Strong proficiency in TypeScript and Node.js.
• Experience with event-driven architecture and tools like Kafka.

Responsibilities

• Architect, develop, and maintain real-time APIs.
• Build scalable microservices with NestJS and gRPC.
• Manage streaming pipelines with Kafka.

Skills

TypeScript

Node.js

Microservices

WebSockets

Kafka

Blockchain fundamentals

Tools

NestJS

gRPC

Docker

Kubernetes

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.

To apply, please share your portfolio, GitHub profile, or examples of past work particularly real-time applications, dashboards, or security/finance-related projects.