UST is looking for the very Top Talent…and we would be delighted if you were to join our familyMore in detail, UST is a multinational company based in North America, certified as a Top Employer and Great Place to Work company with over 35.000 employees all over the world and a presence in more than 35 countries. We are leaders on digital technology services, and we provide large-scale technologic solutions to big companies.What are we looking for?For our specialized team, we are looking for a Senior Software Engineer, with at least 6 years of experience in the position.About the RoleAs a Senior Software Engineer, you'll take technical ownership of critical systems and drive architectural direction across multiple teams. In our agile, DevOps-centric environment, you'll lead the end-to-end lifecycle of high-impact services—shaping design, delivery, and operations—while mentoring engineering leads and influencing best practices at scale.Work location: Madrid (Spain)Work mode: Hybrid (3 days in the office, 2 days remote)Key Responsibilities• Technical Strategy & ArchitectureDefine and evolve the architecture for large-scale, microservices-based systems. o Lead cross-team design reviews, ensuring alignment with performance, security, and scalability goals.• DevOps & Delivery ExcellenceArchitect and optimize CI/CD pipelines for complex, multi-team workflows.Champion observability, resilience, and "everything as code" across infrastructure and deployments.• Feature Leadership & Stakeholder PartnershipOwn the delivery of major features, coordinating with Product, UX, and Operations to meet business objectives.Act as a senior technical liaison for stakeholders—translating strategic goals into actionable roadmaps.• Quality & Engineering StandardsEstablish and enforce coding standards, testing requirements (TDD/BDD), and performance benchmarks.Introduce and evangelize new tools, frameworks, and processes that elevate team productivity and code quality.• Mentorship & Organizational ImpactMentor senior and mid-level engineers—guiding career growth, architectural thinking, and technical decision-making.Lead brown-bags, hackathons, and guild meetings to foster a culture of continuous learning and innovation.Candidate Profile• Experience & Education6-9+ years building and scaling distributed systems in agile/DevOps organizations.o BS/MS in Computer Science (or equivalent industry experience).• Technical MasteryExpert in Java, Spring Boot, RESTful microservices, and event-driven architectures (Kafka, Avro).Strong frontend acumen with React, JavaScript/TypeScript, and API-first integration (OpenAPI).Deep familiarity with Kubernetes orchestration, container security, and infrastructure as code.• Architectural & Analytical SkillsProven track record designing for high availability, performance, and maintainability.Skilled at performance tuning, capacity planning, and defining non-functional requirements.• Leadership & CommunicationExceptional English communication—able to articulate complex technical strategies to executives and engineers alike.Demonstrated ability to influence across organizational boundaries and drive consensus.• Collaboration & VisionEntrepreneurial mindset: you spot opportunities, prototype solutions, and lead adoption of new technologies.Passion for continuous improvement and fostering a world-class engineering culture.Technology StackBackend: Java, Spring Boot, Entity Framework, RESTFrontend: React, Angular, JavaScript/TypeScriptData & Messaging: Oracle, PostgreSQL, Kafka, AvroInfrastructure & DevOps: Kubernetes (PKS), Docker, Helm, TerraformAPIs & Modeling: API-first (OpenAPI), UMLLanguages:English C1Spanish C2 What can we offer? 23 days of Annual Leave plus the 24th and 31st of December as discretionary days Numerous benefits (Health Care Plan, teleworking compensation, Life and Accident Insurances). `Retribución Flexible´ Program: (Meals, Kinder Garden, Transport, online English lessons, Health Care Plan…) Free access to several training platforms Professional stability and career plans UST also, compensates referrals from which you could benefit when you refer professionals. The option to pick between 12 or 14 payments along the year. Real Work Life Balance measures (flexibility, WFH or remote work policy, compacted hours during summertime…) UST Club Platform discounts and gym Access discounts If you would like to know more, do not hesitate to apply and we'll get in touch to fill you in details. We are waiting for youIn UST we are committed to equal opportunities in our selection processes and do not discriminate based on race, gender, disability, age, religion, sexual orientation or nationality. We have a special commitment to Disability & Inclusion, so we are interested in hiring people with disability certificate.