Java jobs in Spain

Madrid, Spain; Paris, France

At Datadog, fullstack engineers build the end-to-end product experiences that power our observability platform. As a Senior Fullstack Engineer with a frontend focus, you’ll drive complex, user-facing features while contributing to the backend systems that support them. You’ll architect performant interfaces at scale, collaborating across disciplines to create seamless product experiences. This role is ideal for engineers who excel in frontend‑led fullstack development and want to have deep ownership over product surfaces that impact customers directly.

At Datadog, we place value in our office culture - the relationships and collaboration it builds and the creativity it brings to the table. We operate as a hybrid workplace to ensure our Datadogs can create a work‑life harmony that best fits them.

Disclaimer: This is not a strict 50/50 frontend–backend split. The exact balance varies by team, project, and product area, and may shift over time. You’ll regularly contribute across the stack, but the role is designed for engineers who prefer and excel at frontend‑led fullstack work.

What You’ll Do:

• Architect, build, and ship end‑to‑end product features—owning everything from frontend UI to backend logic, data modeling, and API design
• Drive technical excellence for the frontend experience, including performance, accessibility, responsiveness, and overall quality
• Collaborate with product managers, designers, and backend engineers to define user experiences, data flows, and APIs
• Improve the reliability and scalability of services that support your features, contributing backend code where needed
• Lead technical discussions, influence architecture decisions, and mentor other engineers on fullstack patterns and best practices
• Ensure strong testing coverage, clear documentation, and long‑term maintainability across the stack

Who You Are:

• You have 6+ years of experience building and shipping production‑grade fullstack features at scale
• Solid backend engineering skills with proficiency in at least one server‑side language (e.g., Python, Go, Java) and familiarity with APIs, databases, and distributed systems
• Ability to interpret broad product requirements and translate them into polished, user‑facing applications
• Strong understanding of frontend architecture, state management, performance tuning, and client‑server interaction patterns
• Excellent communicator with the ability to lead design and architecture discussions in a collaborative, cross‑functional environment

Datadog values people from all walks of life. We understand not everyone will meet all the above qualifications on day one. That's okay. If you’re passionate about technology and want to grow your skills, we encourage you to apply.

Benefits and Growth:

• Generous and competitive benefits package
• New hire stock equity (RSUs) and employee stock purchase plan
• Continuous career development and pathing opportunities
• Employee‑focused best in class onboarding
• Internal mentor and cross‑departmental buddy program
• Friendly and inclusive workplace culture

Benefits and Growth listed above may vary based on the country of your employment and the nature of your employment with Datadog.

Datadog (NASDAQ: DDOG) is a global SaaS business, delivering a rare combination of growth and profitability. We are on a mission to break down silos and solve complexity in the cloud age by enabling digital transformation, cloud migration, and infrastructure monitoring of our customers’ entire technology stacks. Built by engineers, for engineers, Datadog is used by organizations of all sizes across a wide range of industries. Together, we champion professional development, diversity of thought, innovation, and work excellence to empower continuous growth. Join the pack and become part of a collaborative, pragmatic, and thoughtful people‑first community where we solve tough problems, take smart risks, and celebrate one another. Learn more about #DatadogLife on Instagram , LinkedIn, and Datadog Learning Center.

Equal Opportunity at Datadog:

Datadog is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and other characteristics protected by law. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements. Here are our Candidate Legal Notices for your reference.