Senior Software Engineer at Dfns | Paris, FRA | Rezi

Senior Software Engineer at Dfns

Senior Software Engineer

Dfns · Paris, FRA

3 weeks ago

Senior Software Engineer

Dfns · Paris, FRA

23 days ago
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About the Role

Join a team of engineers and cryptographers building the infrastructure behind the next generation of financial systems. You’ll design and operate APIs, microservices, and data systems that handle wallet operations, transaction processing, and integrations across multiple blockchains. You’ll contribute to architecture decisions, improve development workflows, and help ensure the platform remains fast, secure, and resilient.

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.

Skills

  • TypeScript
  • REST APIs
  • Databases (PostgreSQL, DynamoDB, NoSQL)
  • AWS services
  • Microservices
  • CI/CD pipelines
  • Observability
  • SSLDC practices
  • Public key infrastructure
  • Backend security fundamentals

Location

  • US (remote-first)
  • EU (remote-first)

Work Type

  • Full-time
  • Remote-first
  • Office optional

Experience Level

  • Senior

Salary/Compensations

  • $140,000-240,000 per year

Benefits

  • Healthcare
  • Travel expenses
  • 100-200 stock options vested over 4 years
  • MacBook Pro + essentials

About the Company

  • Building the infrastructure behind the next generation of financial systems.