Top Tech Jobs & Startup Jobs in Madrid

Build cloud security training labs and technical content using YAML, Markdown, Bash, and Python. Support training-platform troubleshooting, deliver technical demos and workshops, write courseware, and apply instructional design principles. Use AI coding agents to accelerate lab and script development while validating outputs. Collaborate with senior instructors and cross-functional teams while developing technical depth, teaching ability, and presentation confidence.

Designs, operates, and improves highly available cloud infrastructure for blockchain services across AWS, GCP, and Azure. Responsibilities include managing Kubernetes clusters and autoscaling with Karpenter, building Terraform infrastructure, developing CI/CD pipelines, operating Kafka, Redis, and NGINX, automating with Golang and Python, and improving observability, reliability, security, and disaster recovery. The role also involves production troubleshooting, incident response, on-call participation, and collaboration with software engineering teams.

Lead end-to-end annotation projects: define workflows, coordinate teams (annotators, reviewers, experts), track progress and quality via dashboards, manage launches and phase transitions, pilot tooling and methodology improvements, and build scalable operational systems and documentation to support annotator community and cross-functional alignment.

Manage a four-month maternity-cover marketing contract for DTC e-commerce brands. Responsibilities include developing growth strategies, researching customers and markets, writing persuasive copy, optimizing landing pages and funnels, running A/B tests, reviewing ad creatives, analyzing performance data, coordinating designers and developers, and managing projects through launch and iteration. The role also emphasizes AI tools, workflow automation, CRO, customer insights, and remote cross-functional collaboration.

Build and evolve Rerun’s open-source viewer, cross-language SDKs, and integrations with Rerun Hub. Develop high-performance interfaces for large-scale multimodal data, optimize workflows across desktop and web, make full-stack architecture decisions, and collaborate with backend, Hub, design, customers, and the open-source community. The role involves UI development, rendering, data handling, infrastructure, real-time applications, visualization, and performance optimization.

Develop and maintain sophisticated automated tests across integration, component, UI, load, and distributed systems. Build test harnesses and infrastructure, analyze and triage results, debug production and development issues, and establish quality metrics. Collaborate with engineers, product owners, and analytics teams on testability and requirements. Mentor junior staff, guide automation strategy, reduce technical debt, and influence technical decisions across projects and teams.

Freelance Senior Data Solution Engineer responsible for delivering approximately two custom client data projects monthly. Duties include qualifying requirements, analyzing large datasets with Python and SQL, building dashboards and predictive models, developing business recommendations, presenting findings to clients, documenting projects, and sharing insights with Product. The role requires fluent Spanish and English, freelance status, and availability for a full-time four-to-five-month mission based in Barcelona or Madrid.

Lead the technical vision, architecture, and delivery of high-performance frontend applications, including real-time 2D/3D geospatial visualizations. Build and optimize WebGL rendering pipelines, integrate REST APIs and complex spatial datasets, establish coding and testing standards, troubleshoot performance issues, and mentor frontend engineers. Collaborate with product and executive stakeholders, guide multi-team initiatives, document technical solutions, and oversee software rollouts and improvements.

Lead a product area end-to-end: define roadmap, run discovery, set OKRs, prioritise from customer insights, manage dependencies, partner with engineering and design, and build a 12–18 month AI-first product vision to deliver measurable outcomes.

Leads Masabi’s international bids function, managing tenders from qualification through submission, clarifications, and award. Owns pricing and commercial strategy, bid governance, risk recommendations, resourcing, and cross-functional coordination across business development, product, engineering, services, legal, and finance. Builds the bids function’s people, processes, content, tooling, and AI capabilities while coaching the team and improving win rates.