HiringCafe
Posted 2mo ago

Senior Blockchain Engineer

@ Dfns
View All Jobs
Paris or New York
$140k-$240k/yrRemoteFull Time
Responsibilities:designing indexers, developing smart contracts, building APIs
Requirements Summary:8+ years software engineering with 2+ years in blockchain; strong TypeScript; plus Rust or C++; experience with blockchain indexers, smart contracts, and data pipelines; security and observability focus.
Technical Tools Mentioned:TypeScript, Rust, C++, PostgreSQL, DynamoDB, NoSQL
Save
Mark Applied
Hide Job
Report & Hide
Job Description

Join a team of engineers and cryptographers building the infrastructure behind the next generation of financial systems.

We’re hiring a Senior Blockchain Engineer to design and scale the systems that connect our platform to blockchain networks. You’ll build and operate the services that handle chain integrations, indexing, and data pipelines across major protocols. You’ll work on transaction monitoring, smart contracts, and analysis tools that make our wallet platform faster, more reliable, and easier for developers to integrate. This role combines hands-on engineering with platform ownership. You’ll improve our blockchain infrastructure, strengthen indexing and observability, and ensure our integrations remain secure and resilient under real-world financial workloads.

Responsibilities

  • Design and implement blockchain indexers, data pipelines, and integrations.

  • Develop and maintain smart contracts with a focus on security and performance.

  • Build APIs and services that expose onchain data for wallets and financial apps.

  • Troubleshoot indexing issues, resolve performance bottlenecks, and ensure reliability.

  • Collaborate with product and research to prioritize new blockchain integrations.

  • Document systems, share knowledge, and support technical discussions with partners.

Requirements

  • 8+ years of software engineering experience, with 2+ in blockchain development.

  • Strong in TypeScript, plus ideally one systems language (Rust, C++).

  • Proven experience building blockchain indexers, explorers, or related tooling.

  • Skilled in designing and auditing smart contracts (EVM and non-EVM a plus).

  • Familiar with multiple blockchain ecosystems, both public and private networks.

  • Expertise with databases (PostgreSQL, DynamoDB, NoSQL) and data pipelines.

  • Strong understanding of blockchain security, cryptography, and consensus models.

  • Clear communicator with experience collaborating across product and infrastructure.

Recruitment process

  • Intro call with Co-CEO (30 min)

  • Personality and cognitive tests (45 min)

  • Coding test in a language of your choice

  • Focus interviews with the hiring panel (180 min)

    • Code review

    • Architecture review

    • Security fundamentals

    • Culture check fit

  • Final interview with CTO (30 min)

  • Reference calls and background checks

Terms

  • Title: Senior Blockchain Engineer

  • Salary: $140,000–240,000 per year (full-time)

  • Equity: 100–200 stock options vested over 4 years

  • Benefits: Healthcare and travel expenses

  • Location: US or EU (remote-first, office optional)

  • Equipment: MacBook Pro + essentials