Senior Full-Stack Developer (NodeJS/Typescript)

Senior Full-Stack Developer (NodeJS/Typescript)

osapiens

Madrid, Spain

Your Responsibilities

• Design, build, and optimize full-stack features using modern back-end technologies, ensuring scalability and maintainability. Front End experience is good to have;
• Develop and enhance innovative software solutions that automate complex compliance workflows for businesses of all sizes;
• Collaborate closely with product managers, designers, and engineers in small, agile squads (5-7 people) to define, refine, and implement features;
• Ensure high-quality, secure, and efficient code through rigorous reviews, automated testing, and continuous integration/deployment (CI/CD) practices;
• Own the architecture and design of JavaScript-based solutions, optimizing for performance, reliability, and user experience;
• Contribute to technical strategy and decision-making, identifying opportunities for innovation and process improvements;
• Mentor and support junior developers, fostering a culture of learning and technical excellence within the team.

Your Experience

• Strong experience (6+ yrs) in full-stack development with a focus on Backend (Node.JS and TypeScript) React.JS is desirable;
• Expertise in web services development and integration (REST, GraphQL, etc.);
• Familiarity with Git for version control and collaboration;
• Strong product mindset – you think beyond code, considering user experience, business impact, and scalability;
• Agile experience – comfortable working in sprints, participating in stand-ups, and iterating quickly;
• Excellent communication skills in English (C1). Spanish is a bonus but not necessary.