Top Tech Jobs & Startup Jobs in Barcelona

Design, build, and refine hotel optimization models and A/B testing frameworks. Identify revenue and automation opportunities, implement solutions using SQL and Python/R, build API connectivity and dashboards (Power BI/Tableau), and grow a new hotel optimization team.

The Backend QA Engineer will design tests for APIs and databases, validate performance, and maintain quality through collaboration with engineering teams.

Lead the Content-as-a-Service product area by owning the roadmap, prioritizing complex requirements, guiding a cross-functional team in a Scrum environment, aligning stakeholders, ensuring scalable integrations and analytics tracking, and driving continuous improvement across markets.

The Clinical Research Associate II will conduct site visits, ensure compliance and data integrity, collaborate with sites, and prepare study documents.

Design and architect scalable, secure enterprise back-end systems using Java/Spring Boot, CQRS, messaging and RESTful APIs; collaborate in Agile teams, mentor developers, refactor for performance and cost, integrate cloud deployments and security, and lead data transformation initiatives.

Work directly with the founder to coordinate projects, manage the CRM and business development pipeline, prepare materials, handle scheduling and logistics, organise internal processes, and build AI agents and automated workflows to streamline repetitive work.

Be the hands-on technical owner of the LiteAPI product: design, implement, and operate backend/API infrastructure, lead technical decisions, work closely with product, stakeholders, and customers, and mentor engineers while shipping high-impact features in a fast-moving startup.

Own end-to-end product design for a mobile-first AI companion app: design relationship systems, character profiles, gamification, retention and monetization flows. Prototype and iterate from research and analytics into interactive prototypes and high-quality mobile-first interfaces. Build and maintain a cross-platform design system, collaborate closely with engineers, and contribute to brand and marketing as needed.

Lead and deliver EHS due diligence, compliance assessments and audits for M&A, private equity and operational clients. Review management systems, permits and regulatory obligations, develop corrective action plans, prepare technical reports, support business development, mentor junior staff, and monitor emerging EHS regulations across Iberia and Europe.

Lead product positioning and messaging for an AI-native transcription and conversation-intelligence product. Talk to customers, run agentic growth experiments across channels, validate and scale high-intent niche segments, and own website and campaign copy.