Senior Software Engineer
About this role
Join a team of engineers and cryptographers building the infrastructure behind the next generation of financial systems.
We’re hiring a Senior Software Engineer to build and scale the core backend services that power our platform. You’ll design and operate APIs, microservices, and data systems that handle wallet operations, transaction processing, and integrations across multiple blockchains. You’ll work closely with product, security, and infrastructure teams to turn complex requirements into reliable production systems. This role goes beyond implementation. You’ll contribute to architecture decisions, improve development workflows, and help ensure the platform remains fast, secure, and resilient under real-world financial workloads.
Responsibilities
Design, build, and maintain secure, scalable backend services and APIs (REST).
Architect databases and microservices for performance, reliability, and growth.
Own projects end to end: from requests, implementation to production and iteration.
Troubleshoot complex issues, resolve performance bottlenecks, ensure resilience.
Collaborate with product, security, and leadership on roadmap and technical direction.
Document systems, share knowledge, and support client-facing discussions.
Requirements
8+ years of backend software engineering experience in fintech or finance.
Strong in TypeScript, proven track record building scalable APIs and dev tools.
Expertise with databases (PostgreSQL, DynamoDB, NoSQL) and AWS services.
Skilled in microservices, CI/CD pipelines, observability, and SSLDC practices.
Familiar with public key infrastructure and backend security fundamentals.
Strong problem-solving, clear communication, and ability to deliver under pressure.
Recruiting Process
Intro call with Co-CEO (30 min)
Personality and cognitive tests (45 min)
Coding test in the 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 Software 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.
Company at a glance
Dfns is the leading Wallets-as-a-Service (WaaS) platform for simplifying digital asset management and powering onchain services at scale. Our programmable wallet platform brings together transaction management, workflow governance, key orchestration, and third-party integrations into one secure operating system for blockchains, enabling custody, payments, trading, tokenization, and banking. Built on advanced security and cryptography, Dfns is trusted by over 300 financial institutions and applications—including DTCC, ABN AMRO, Broadridge, Fidelity, Zodia Custody, Banca Sella, Stripe, Moonpay, Circle, IBM, Deblock, Republic, Gemini—and secures over $5 billion in monthly transactions.
Founded in 2020, Dfns has raised $30 million from global investors such as Further Ventures, White Star Capital, Motive Ventures, 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.
Top Benefits
- Healthcare
- Travel Expenses
- Stock Options
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