Senior Software Engineer

Back to all rolesSenior Software EngineerApplyJob detailsDepartments / EngineeringParisFull-time€80,000 EUR - €140,000 EURJoin 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.ResponsibilitiesDesign, 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.Requirements8+ 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 ProcessIntro call with Co-CEO (30 min)Personality and cognitive tests (45 min)Coding test in the language of your choiceFocus interviews with the hiring panel (180 min)Code reviewArchitecture reviewSecurity fundamentalsCulture check fitFinal interview with CTO (30 min)Reference calls and background checksTermsTitle: Senior Software EngineerSalary: $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.Upload your resume to autofill the applicationUploadFirst name *Last name *Email *Dial codePhone numberLinkedIn profile *Please upload your resume (preferably as a PDF file) *Click or drag file to uploadSupported file format: .PDF; Maximum file size: 10.49 MB; Maximum file: 1;Untitled sectionCover letterYour answer0/10000AI disclaimerThis application process may use AI-enabled systems to support candidate evaluation based on factors such as experience, technical skills, and qualifications. All processing is carried out in accordance with applicable data protection, AI governance, and labour laws. Human oversight is maintained at all stages, and final hiring decisions are made by people. Personal data submitted as part of this application is not used to train AI models.I have read and understood the privacy policy and acknowledge that my personal data will be processed as part of this application.ApplyApplyHire withPrivacy Policy