Senior Java Developer (Relocation to Madrid)

Location : Madrid, Spain (3 days / week onsite in city center)

Eligibility : EU Citizens or Candidates with a Valid European Work Visa

About the Role :

UST is looking for a Senior Software Engineer with strong expertise in Java and Cloud-native platforms. As 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.

Key Responsibilities :

• Technical Strategy & Architecture : define and evolve the architecture for large-scale, microservices-based systems : Lead cross-team design reviews, ensuring alignment with performance, security, and scalability goals.
• DevOps & Delivery Excellence : Architect and optimize CI / CD pipelines for complex, multi-team workflows. Champion observability, resilience, and “everything as code” across infrastructure and deployments.
• Feature Leadership & Stakeholder Partnership : Own 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 Standards : Establish and enforce coding standards, testing requirements (TDD / BDD), and performance benchmarks. o Introduce and evangelize new tools, frameworks, and processes that elevate team productivity and code quality.
• Mentorship & Organizational Impact : Mentor senior and mid-level engineers—guiding career growth, architectural thinking, and technical decision-making. o Lead brown-bags, hackathons, and guild meetings to foster a culture of continuous learning and innovation.

Mandatory Requirements :

• 9 - 12+ years building and scaling distributed systems in agile / DevOps organizations.
• Expert in Java, Spring Boot , RESTful microservices, and event-driven architectures ( Kafka , Avro).
• Deep familiarity with Kubernetes orchestration , container security, and infrastructure as code.
• English level : C1 (professional fluency).

What We Offer :

• Annual Leave : 23 days + 24th and 31st December as discretionary holidays.
• Flexible Compensation Options : Meals, transport, kindergarten, online English lessons, and more.
• Work-Life Balance : Remote / hybrid model, flexible hours, and compacted summer schedules.
• Relocation Package : will be covered by the company side.
• Employee Benefits : Private health insurance, accident insurance, and connectivity support.
• Training Access : Free access to leading training platforms and continuous learning opportunities.
• Referral Bonuses : Earn rewards when you refer qualified professionals.
• Salary Payment Choice : Opt between 12 or 14 payments annually.
• Wellbeing Extras : Discounts on gyms and UST Club partner deals.

Inclusion & Diversity at UST

We believe in equal opportunities and encourage applications from all backgrounds. We are especially committed to hiring individuals with a disability certificate as part of our inclusion goals.

Senior Java Developer • Madrid, Community of Madrid, Spain