Senior Frontend Engineer

About

Dfns is the leading Wallets-as-a-Service (WaaS) platform, helping fintechs, institutions, and enterprises simplify digital asset management and securely onboard users onchain.

Its API-first wallet platform unifies transaction management, workflow governance, key deployment, and third-party integrations into one secure operating system for blockchains. Built on advanced security and cryptography, Dfns is trusted by over 200 financial institutions and applications—including ABN AMRO, Broadridge, Fidelity, Zodia Custody, Banca Sella, Stripe, Moonpay, Circle, IBM, Deblock, and Gemini—and secures over $3 billion in monthly transactions.

Founded in 2020, Dfns has raised $30 million from global investors such as White Star Capital, Motive Partners, Bpifrance, Coinbase, Wintermute, and Susquehanna. Originally incubated by Techstars and Station F in Paris, Dfns now operates globally with teams across the US, Europe, the Middle East, and Asia.

Job Description

We’re hiring an engineer to help us drive the user-facing side of our platform. This isn’t a narrow frontend role: you’ll be building web and mobile apps, refining SDKs, and designing interfaces that feel fast, intuitive, and trustworthy. You’ll move fluidly between polished user experiences and the developer tools that make them possible. We’re looking for someone with deep expertise in modern frameworks and cross-platform development, paired with strong UX instincts and a track record in fintech. You understand the craft of building business-grade software: noticing the details, moving quickly, and delivering with rigor. In this role, you’ll own features end to end, turning complex requirements into tools that make financial workflows effortless for developers, admins, and end users. Speed matters, but never at the expense of security, clean architecture, reliable performance, and clear docs.

Preferred Experience

Responsibilities

  • Take full ownership of features, from idea to launch to iteration.

  • Build web and mobile apps for our Wallets-as-a-Service platform.

  • Develop SDKs and tools that make integrations simple.

  • Bring fintech-grade UX to blockchain wallets.

  • Design for clean architecture, speed, and security.

  • Work with product and design to shape and ship features fast.

  • Write clear docs, review code, and uphold high standards.

Requirements

  • 8+ years of frontend engineering, with fullstack experience.

  • Strong in TypeScript and modern frameworks (React Native, etc.).

  • Skilled in mobile and cross-platform development.

  • Hands-on with WebAuthn, passkeys, and secure authentication flows.

  • Proven record of shipping user-facing products in fintech or onchain.

  • Strong sense of UX, detail-oriented, and committed to reliable code.

  • Clear communicator who works well in fast-moving, collaborative teams.

Recruitment Process

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 Frontend Engineer.

  • Salary: $160,000-220,000 per year (full-time).

  • Equity: 100-200 stock options vested over 4 years.

  • Benefits: Healthcare, 401K, and travel expenses.

  • Location: United States (remote-first, office optional).

  • Equipment: MacBook Pro + essentials.

Additional Information

  • Contract Type: Full-Time
  • Location: Paris, New York
  • Experience: > 7 years
  • Possible full remote
  • Salary: between 160000$ and 220000$ / year
Apply Now

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