Full Stack Engineer (FinTech)

SEALTH LLC
United States
about 1 month ago
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Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Experience level
Experienced
Experience required
4 years minimum
Compensation
$140,000.0 - $200,000.0
Working hours
Regular working hours
Job source

Tech stack

Application Programming Interfaces (APIs) Code Review Relational Databases Payment Systems PostgreSQL Node.Js Blockchain Next.js TypeScript Web 2.0 Web Applications ReactJS
+7 more
Backend Event Driven Architecture Solidity Apache Kafka Graphql Web3.js Api Design

Job description

  • Build and maintain full-stack features across our web app and API layer
  • Design and implement backend services in TypeScript/Node.js with PostgreSQL
  • Develop React/Next.js frontends that are fast, accessible, and production-grade
  • Integrate with blockchain data sources, smart contracts, and wallet infrastructure
  • Work closely with the PM and design on implementation feasibility and tradeoff decisions
  • Write tests, participate in code reviews, and own your features end-to-end

Requirements

  • Advanced smart contract experience in the DeFi space. *

  • Hands-on with leading protocols and infrastructure: ideally Centrifuge, Fireblocks, oracles, and a range of DeFi protocols. *

  • Able to design, integrate, and optimize protocol interactions
  • that meet the standards of both institutional and retail users.
  • Web2 / infrastructure breadth (essential):
  • Comfortable deploying and operating infrastructure on AWS.
  • A strong senior-level backend software engineer.
  • Fluent working across the Web2 financial technology ecosystem.
  • Operates autonomously with very little oversight.
  • Takes ownership end to end and moves quickly with minimal direction.
  • Operates with sense of urgency 4+ years of full-stack engineering experience
  • Strong in TypeScript, Node.js (NextJS or Express), and React/Next.js
  • Solid understanding of relational databases (PostgreSQL) and REST/GraphQL API design
  • Familiarity with Web3 tooling: ethers.js or viem, wallet connections, on-chain reads
  • Experience with event-driven architecture (Kafka, Pub/Sub, or similar)
  • Bonus: prior fintech experience (payment rails, ledger systems, compliance infrastructure)
  • Bonus: Solidity or Rust (even hobby-level) is a real differentiator

About the company

Venture-backed startup, focused on building foundational infrastructure at the intersection of fintech and Web3. We are currently in stealth mode, developing USHP- a next-generation product designed to address critical gaps in financial systems.

We are a small, deliberate team at an early stage. The people joining now will shape not just what we build, but how we build it, our culture, our standards, and our long-term trajectory. We are not looking for passengers; we are looking for builders who take ownership and thrive in environments where the path is still being defined.

Due to the nature of our work, specific product details are shared during the interview process under NDA.

USHP is building two related products: a proprietary daily predictive index of U.S. home prices, and an on-chain token whose value tracks that index. The token is collateralized by real U.S. residential properties and pays staking yield from the net income generated by the underlying portfolio. The protocol includes a full DeFi integration suite: Pendle yield tokenization, Aave/Morpho collateral, and Uniswap/Curve liquidity.

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Good distractions

Talks and stories from around this role — technically off-topic, practically not.

1:52 min

Structuring and scaling the backend engineering team

Stefan Lingler Stefan Lingler +1 · Coffee With Developers

2:52 min

Generating APIs with the Neo4j GraphQL library

William Lyon · LIVE

3:26 min

Automating programmable logic using smart contracts and JavaScript tools

Ryan Arndt · World Congress 2023

1:44 min

Background and career journey in regulated software systems

Martin Hynie · Coffee With Developers

1:38 min

Transitioning into backend engineering from web development

Stefan Lingler Stefan Lingler +1 · Coffee With Developers

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Choosing TypeScript for complex backend applications

Maximilian Otto Maximilian Otto · World Congress 2024

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