Senior Full-Stack Engineer

We're looking for a Senior Full-Stack Engineer who is strong in .NET and Angular, but equally comfortable adapting across technologies and stacks when the project calls for it. You'll join our engineering team on a large-scale modernization project for a leading US healthcare platform, helping transform complex legacy systems using modern .NET, Angular, and AI-assisted development workflows. Strong engineering fundamentals are the key. We're looking for someone who cares deeply about code quality and can contribute to architecture, infrastructure, backend services, and overall system design. AI experience is an important part of the role, but we're not simply looking for someone who "uses AI." We want an engineer who knows how to make AI genuinely useful in their workflow from providing the right context and prompting effectively to validating AI-generated output, identifying gaps, and using AI to navigate and improve complex codebases. This is a highly autonomous role where you'll collaborate with an international team, solve complex engineering challenges, and contribute architectural ideas that shape the modernization effort. Our Mission, Vision, and Values At Space Inch, we prioritize alignment with our clients and team, ensuring a deep understanding of their needs. We are committed to delivering exceptional work while supporting the personal and professional growth of our team members. Our Stance on AI and Technology Transitions We don't just "accept" AI; we encourage its usage to enhance productivity and code quality. If you're a Senior Engineer, AI-proficient, with a proven track record of picking up new languages quickly, you might be a great fit to our team. We value senior-level architectural thinking and problem-solving over rigid adherence to a specific syntax. About Working At Space Inch Global Footprint: Our team is around 80 people, primarily based in Croatia, but also with members in South America, the EU, and the US; the product team mostly being in the US, and engineering in Croatia and BrazilRemote-First: We are remote-first, but occasional travel may be required, e.g. for our annual company retreat, or meeting the clientLong-Term Vision: We work on end-to-end projects with a long-term visionTrue Work-Life Balance: We strongly support work-life balance for our team members, even though we work in different time zones Requirements Experience: 7+ years in professional software development, with 5+ years specifically focused on .NET and AngularBackend & Data: Strong general backend fundamentals and deep hands-on expertise with MS SQL ServerCloud & Containers: Experience with Docker and AWS environments (ECS, S3)AI Tooling Fluency: Advanced daily use of AI tools - prompting, validating AI-generated output, and managing AI coding agents (working experience with Claude AI is a plus)Architecture: Solid understanding of software architecture, database management, and backend microservice interactionsDevOps & CI/CD: Familiarity with CI/CD pipelines, security best practices (web tokens, OAuth), Kubernetes, and cloud infrastructure Bonus points for: Experience modernizing legacy codebases (.NET Framework, Visual Basic)Exposure to React Key Responsibilities Architect and Build: Design, develop, and deploy high-quality applications and microservices, owning the backend architecture and coding standardsCollaborate: Work closely with other developers, product managers and cross-functional teams (including client teams) to translate requirements into elegant technical solutionsSystem Modernization: Leverage modern .NET stacks and AI tools to refactor and modernize legacy componentsInfrastructure & Ops: Oversee database management and backend service interactions within cloud environmentsQuality First: Write clean, maintainable code, conduct thorough code reviews, mentor other developers and share your knowledgeOptimize: Debug and fine-tune existing systems to ensure maximum performance, responsiveness, and reliability Typical Challenges You'll be Solving Modernizing legacy modules into a modern, microservice-based .NET ecosystem using AI accelerationArchitecting resilient backend systems for high-concurrency healthcare workflowsBalancing rapid feature delivery with architectural quality and system performanceEnsuring security compliance, data accessibility, and high system availability Qualities for Success Proactive, solutions-driven mindsetStrong attention to detail and code qualityComfortable making technical decisions independentlyPassion for learning and improvingOwnership mentality, i. e. you care about the end product This Job is Right for You If You thrive in collaborative yet autonomous environmentsYou enjoy shaping backend architecture and best practicesYou view AI as an essential force multiplier in your daily coding workflowYou value quality and thoughtful delivery over rushing This Job is not Right for You If You expect constant supervision or micromanagementYou only want to build brand-new features from scratch and dislike improving, refactoring, or scaling existing systemsYou view your role strictly as "writing code to spec" without engaging in product discussions or caring about the end-user impactYou do not actively use AI tools in your day-to-day software development workflow Benefits What's In It for You Real influence on technical decisions and project directionProfessional development supportWork-life balance, transparency, and long-term relationships that aren't just for show Compensation And Benefits Monthly salary: 4000-5200 EUR gross 1, based on experience and skills Remote-first setup with optional use of our Zagreb office Stay active: Multisport card or wellness subsidy Health & Wellbeing: 100% paid sick leave + annual health checkups Extra perks: Christmas bonus and referral bonus Grow with us: Education budget to fuel learning and professional development Space Inch is not responsible for any job boards scraping this ad without showing the position as remote, but Croatia exclusive. Applicants from other countries will not be considered. Space Inch is committed to providing an environment of equal employment opportunity. We do not discriminate on the basis of race, color, religion, sex (including pregnancy, sexual orientation, or gender identity), national origin, age, disability, genetic information, or any other characteristic protected by applicable law. This commitment extends to all aspects of employment, including recruitment, hiring, training, promotion, compensation, benefits, and termination. Space Inch believes in treating all employees and applicants with respect and dignity, fostering a workplace where everyone has the opportunity to succeed.