Lead Mobile 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 a Lead Mobile Engineer to drive the user-facing side of our platform. This role is all about mobile: you’ll design and build iOS and Android apps, refine cross-platform frameworks, and craft interfaces that feel fast, intuitive, and trustworthy. You’ll also shape the SDKs and developer tools that make our mobile app better. We’re looking for deep mobile expertise (React Native), native iOS/Android knowledge, and strong UX instincts. You’ve shipped real products in fintech or blockchain, know how to balance speed with rigor, and care about clean architecture, security, and reliability. In this role, you’ll own projects end to end, turning complex requirements into simple, trustworthy workflows for admins and their end-users.

Preferred Experience

Responsibilities

  • Lead the design and development of our iOS/Android apps.

  • Own features from idea to launch to iteration.

  • Refine SDKs and cross-platform frameworks for smooth integrations.

  • Bring fintech-grade UX and bank-grade security to mobile wallets.

  • Set high standards for performance, security, and architecture.

  • Partner with product and design to ship features fast.

  • Write clear docs, review code, and mentor teammates.

Requirements

  • 8+ years in mobile engineering, with experience leading projects.

  • Expert in React Native or native mobile (Swift, Kotlin, etc.).

  • Skilled in cross-platform development and SDKs.

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

  • Proven record of shipping mobile apps in fintech or onchain.

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

  • Clear communicator who thrives in fast-moving 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: Lead Mobile Engineer.

  • Salary: $140,000-220,000 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 140000$ and 220000$ / year
Apply Now

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