About AtmenAtmen is a RegTech startup revolutionising green certification. Our SaaS platform helps energy‑intensive industries (fuels, chemicals, materials) automate compliance and certification — cutting down time by up to 90%. We replace today's manual, costly, and unpredictable certification processes with continuous, technology‑driven verification. Our mission? Making sustainable production simple, scalable, and cost‑effective. TasksAs a Senior Software Engineer, you will play a key role in shaping our product, working closely with our engineering and product teams to build robust, scalable, and maintainable software solutions. You will: Develop, test, and deploy full-stack software solutions, ensuring high-quality, maintainable code. Drive development from ideation to production, working closely with designers, engineers, and product managers. Lead by example by writing clean, testable code and supporting engineering best practices. Own features end‑to‑end —from architecture to implementation, deployment, and monitoring. Improve performance, reliability, and scalability to ensure our platform meets enterprise‑grade standards. Mentor and collaborate with team members, fostering a culture of continuous learning and growth. RequirementsMust‑haves 5+ years of professional experience in software development, preferably in full‑stack roles. Proficiency in TypeScript, React, Node.Js, PostgreSQL, and AWS. Strong software engineering principles: clean code, modularity, testing, and maintainability. Experience designing and maintaining scalable, distributed systems. Self‑motivated and able to navigate a fast‑changing startup environment. Excellent communication skills in English (both written and spoken). Master’s degree or equivalent experience in Computer Science, Engineering, or a related field. Nice‑to‑haves Experience with Test‑Driven Development (TDD) and end‑to‑end testing. Exposure to AI / ML or GenAI integrations. Related domain expertise: energy, certification, sustainability, or regulated industries. Experience working in a fast‑paced startup environment. Our core technologiesFrontend: React, TypeScript Backend: Nest.Js (Node.Js, TypeScript) Testing: Cypress, Jest Infrastructure: AWS (AWS CDK) Nx, GitLab CI Job requirementsAvailability: Full‑Time / Part‑Time Valid working permit in Spain Fluency in English Willingness to regularly work in our office in Madrid, Spain. BenefitsAsynchronous first: We minimise unnecessary meetings and document everything in Notion. Focus time & deep work: Meetings‑free mornings + 1 in‑office Team Day per week. Fast‑paced, iterative development: We push to main frequently and release several times per week. Strong testing culture: Pragmatic TDD, heavy use of E2E tests. How we workAsynchronous first: We minimise unnecessary meetings and document everything in Notion. Focus time & deep work: Meetings‑free mornings + 1 in‑office Team Day per week. Fast‑paced, iterative development: We push to main frequently and release several times per week. Strong testing culture: Pragmatic TDD, heavy use of E2E tests. Why Join Us?Impact: Be part of a small, high‑performing team driving real‑world sustainability impact. Hybrid work and Madrid office: work from the office and from home. Growth: Join an early‑stage startup with significant ownership and career growth potential. Cutting‑edge tech: Work on exciting challenges in automation, AI, and compliance tech. Unlimited access to most fitness centres as an employee benefit. Apply for this positionSend your CV + cover letter (optionally) + answer our screening questions. Equality and DiversityAtmen is an equal opportunity employer. We embrace diversity and are committed to creating an inclusive environment for all employees and stakeholders. We are open to all candidates without regard to age, color, national origin, religion, gender or any other characteristics.#J-18808-Ljbffr