Job Summary: Indra is seeking a Software Engineer specialized in secure development to contribute to strategic R&D projects, applying software engineering and quality principles. Key Highlights: 1. Lead the development of cutting-edge technological solutions in security. 2. Work with state-of-the-art technologies on high-impact projects. 3. A close-knit, transparent environment with flexibility to organize your work. **Location:** Madrid, MD, ES **Professional Profile:** Software Development – Legacy Languages **Required Experience:** More than 2 years of experience **Work Modality:** Hybrid At **Indra Group, we protect what matters most.** We lead the development of cutting-edge technological solutions that strengthen national and international security. Join our team working on European projects! As part of our positioning as a leading company in the defense sector, we aim to strengthen our team with a **Software Engineer specialized in secure development**, contributing to a strategic R&D project by applying best practices in software engineering, security, and quality. **What You’ll Do:** * Design and develop software following layered architecture principles, SOLID principles, and sound testing practices. * Work with at least two technology stacks (Java, Python, Rust, or others), applying robust design patterns. * Design and document REST APIs according to OpenAPI standards, including versioning, idempotency, pagination, and rate-limiting mechanisms. * Model and optimize SQL databases (indexes, transactions) and collaborate on NoSQL models when required; manage migration processes. * Apply security throughout every phase of development: input validation and normalization; protection against XSS, CSRF, SQLi, SSRF, insecure deserialization, path traversal, and other OWASP Top 10 risks. * Integrate secure authentication and authorization mechanisms: OIDC/OAuth2, JWT (aud/iss/exp), session management, refresh tokens, and scope/role/claim definitions. * Apply practical cryptography: TLS, bcrypt/argon2, encryption in transit and at rest, and sound key management practices. * Implement DevSecOps strategies: unit testing, integration testing, contract testing, and security testing. * Enhance software observability through structured logging, correlation IDs, metrics, alerts, and secure error handling. * Design resilient systems using retries/backoff, timeouts, circuit breakers, and controlled degradation strategies. * Apply “secure by design” principles: least privilege, separation of responsibilities, auditing, and traceability. * Participate in code reviews with a security focus and provide improvement recommendations. * Collaborate with security and operations teams, clearly communicating risks, trade-offs, and remediation plans. **What We’re Looking For:** Don’t worry if you don’t meet 100% of the criteria—we encourage you to apply, learn about our offer, and let us discover what you can bring to our team! * At least 4 years of software development experience. * Proficiency in at least two technology stacks (Java, Python, Rust, or equivalent). * Experience with layered architecture, SOLID principles, and robust software design. * Experience designing and implementing REST APIs and documenting them using OpenAPI. * Solid understanding of SQL databases and familiarity with NoSQL concepts. * Strong knowledge of application security, OWASP Top 10, and sound input validation practices. * Experience with modern authentication/authorization mechanisms (OIDC, OAuth2, JWT, etc.). * Knowledge of practical cryptography oriented toward production environments. * Experience with DevSecOps strategies, testing, and observability. * Knowledge of resilient system design. * Experience in code review and communication with multidisciplinary technical teams. * Availability for hybrid work in Madrid. **What We Offer:** * **Stability and Future:** Long-term projects within a leading defense company employing over 50,000 professionals, backed by financial stability. * **Innovative and High-Impact Projects:** Work with state-of-the-art technologies delivering both national and international impact. * **Close-Knit and Transparent Environment:** Direct, fluid communication with managers and colleagues in a collaborative, open setting. * **Autonomy and Flexibility:** Freedom to organize your work, with genuine work-life balance adapted to your pace (hybrid model). * **Personalized Career Plan.** * **Continuous Training:** Open University, Udemy for Business — over 6,000 courses. * **Well-being Discounts:** Gyms, restaurants, shops, leisure activities, etc. * **Competitive Compensation** and flexible remuneration plans. Location: Alcobendas Modality: Hybrid What Does Our Selection Process Look Like? Profile Review – We assess your experience and skills to determine alignment with our requirements. Initial Contact (5–10 min) – If you receive a call from an unknown number, it’s our team! A brief conversation to get to know you and address any questions. Technical Interview – You’ll meet the team, who will explain the project and daily tasks, explore your technical knowledge, and conduct brief psychological and English competency assessments (if required). Offer and Onboarding – If everything goes well, you’ll join our team and begin this new chapter together! Estimated Duration: 1–2 weeks. Our commitment is to foster workplaces where individuals are treated with respect and dignity, supporting professional development for all employees while guaranteeing equal opportunity in selection, training, and promotion—ensuring a workplace free from discrimination based on gender, age, disability, sexual orientation, gender identity or expression, religion, ethnicity, marital status, or any other personal or social circumstance. Indra is a Top Employer 2025! Join a company certified as one of Spain’s best employers, thanks to our comprehensive HR management and the conditions we offer our professionals.