{"id":468934,"url":"https://alion.io/job/dfns-senior-software-engineer","title":"Senior Software Engineer","company":{"id":175593,"name":"Dfns","domain":"dfns.co","url":"https://alion.io/company/dfns","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Deel","truth_index":{"grade":"B","score":81,"open_postings":9,"ghost_share":0,"stale_share":0.778,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-23T05:54:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Paris, France"],"countries":["FR"],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":80000,"max":140000,"currency":"EUR","period":"year","gross":null,"usd_annual":157034},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"DynamoDB","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Rest API","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-03-11T17:30:49Z","employer_posted_date":"2026-03-11","last_verified_at":"2026-10-24T02:55:24Z","board_verified":true,"closed_at":null,"days_open":226,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":225},"description":"Join a team of engineers and cryptographers building the infrastructure behind the next generation of financial systems.\nWe’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.\nResponsibilities\nDesign, build, and maintain secure, scalable backend services and APIs (REST).\n\nArchitect databases and microservices for performance, reliability, and growth.\n\nOwn projects end to end: from requests, implementation to production and iteration.\n\nTroubleshoot complex issues, resolve performance bottlenecks, ensure resilience.\n\nCollaborate with product, security, and leadership on roadmap and technical direction.\n\nDocument systems, share knowledge, and support client-facing discussions.\n\nRequirements\n8+ years of backend software engineering experience in fintech or finance.\n\nStrong in TypeScript, proven track record building scalable APIs and dev tools.\n\nExpertise with databases (PostgreSQL, DynamoDB, NoSQL) and AWS services.\n\nSkilled in microservices, CI/CD pipelines, observability, and SSLDC practices.\n\nFamiliar with public key infrastructure and backend security fundamentals.\n\nStrong problem-solving, clear communication, and ability to deliver under pressure.\n\nRecruiting Process\nIntro call with Co-CEO (30 min)\n\nPersonality and cognitive tests (45 min)\n\nCoding test in the language of your choice\n\nFocus interviews with the hiring panel (180 min)\nCode review\n\nArchitecture review\n\nSecurity fundamentals\n\nCulture check fit\n\nFinal interview with CTO (30 min)\n\nReference calls and background checks\n\nTerms\nTitle: Senior Software Engineer\n\nSalary: $140,000-240,000 per year (full-time).\n\nEquity: 100-200 stock options vested over 4 years.\n\nBenefits: Healthcare and travel expenses.\n\nLocation: US or EU (remote-first, office optional).\n\nEquipment: MacBook Pro + 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