Software Engineer

We're building the world's first invisible biometric authentication system at TWOSENSE.AI . Our technology recognizes users by their unique behaviors—how they type, swipe, and move—eliminating passwords and security friction. No more authentication headaches, just seamless security that works in the background. We're an engineer-founded team of PhDs and exceptional developers who value autonomy, transparency, and technical excellence. This is a fully remote position where you'll directly shape our product and your career trajectory. What You'll Do You'll be working on the core product alongside the team and directly with our CTO John . Your day-to-day will be a mix of developing new features, reviewing code, and supporting existing codebases. You will be directly responsible for advancing our products across multiple platforms, in addition to developing backend API’s and partner integrations. You will be involved in the full development lifecycle including: design, development, testing, deployment, and maintenance. You'll Love This If You’re comfortable in the chaos of a startup, but also like working on a team that’s dedicated to finding the right way to build things, and building them right the first time. You also: Obsess over writing clear and “clean code.” Believe in strong peer review and value feedback as an opportunity for reflection and improvement. Practice test-driven/test-first development. Take pride in your craftsmanship to develop maintainable software products. Have a “team-first” mentality and love collaborating with other team members. Take initiative to detect problems before they arise, and identify potential solutions. Have the ability to communicate clearly with team members and the rest of the business. Most of all, you are looking to learn new things every day, and how much you’re learning is one of the key things you care about. Must-haves: Located in Argentina Strong experience with C#, .NET Core, and EF Core Strong understanding of SOLID principles, especially SRP and DIP Proficiency in automated unit and integration testing strategies Familiarity with SQL and relational databases Demonstrated ability to ship production code with AI-assisted workflows Great communication skills Experience designing and consuming REST APIs Strong grasp of common design patterns and best practices Nice-to-haves: Hexagonal/Clean/Onion architecture Domain-Driven Design Win32 API / C++ TypeScript or JavaScript SAML / OIDC Machine Learning Python macOS development Why Join Us: Fully remote - Work from anywhere Meaningful equity - Own a piece of what you build Flexible PTO - Take time when you need it Monthly project days - Dedicate one day a month to something you’re passionate about Online learning resources - O'Reilly, Pluralsight, technical books, etc… Team gatherings - Travel covered for company meet-ups and team events Full tech setup - High-end equipment, VPN, and resources provided We're growing fast, and you'll have plenty of opportunities to shape the company, influence our direction, and rapidly grow your career.