Top Tech Jobs & Startup Jobs in Madrid

Own a book of 13-25 enterprise accounts across Spain/Portugal, generate ~50% of your pipeline, run full sales cycles (3-9 months) from discovery to close, deliver demos and business cases, prioritize new-logo acquisition, and collaborate with product, marketing, customer success, and engineering to scale Cresta’s Iberia presence.

Leads the technical vision, architecture, development, and migration of Sezzle’s authentication and authorization platform. Designs scalable Golang gateway and identity services on AWS, establishes OAuth2/OIDC, token, service authentication, and authorization standards, and drives secure zero-downtime migrations. Partners with security and engineering teams on compliance, observability, CI/CD, incident response, and reliability while mentoring engineers and influencing technical strategy across the organization.

Review and annotate images by identifying people, actions, and predefined categories. Follow detailed annotation guidelines, maintain accuracy and consistency, review completed work, and help create high-quality datasets for AI models. The role requires strong attention to detail, independent work, reliability, and EU citizenship with residence in the European Union.

Conduct attacker-driven security research on Aave protocol changes, smart contracts, integrations, and critical dependencies. Review architecture and code before audits or deployment, identify exploitable protocol risks, contribute to AI-assisted security tooling, and translate findings into invariants, testing, monitoring, and incident-response improvements. Collaborate with engineers, auditors, and monitoring teams while communicating risk, severity, uncertainty, and trade-offs clearly.

Own and scale paid digital acquisition and account-based marketing programs across global markets. Manage paid media agencies, budgets exceeding $1 million, campaign targeting, performance optimization, and marketing development funds. Track CPL, CAC, ROAS, pipeline efficiency, and lead quality while partnering with sales, product, marketing teams, cloud providers, and external vendors to generate qualified leads, pipeline, and revenue.

Lead the modernization of business-critical legacy PHP systems into scalable Node.js and Next.js architectures. Provide hands-on coding, architectural guidance, API and microservices design, debugging, refactoring, and incremental migration leadership. Translate undocumented business logic into maintainable solutions, leverage AI-assisted development tools, communicate trade-offs to stakeholders, establish engineering standards, and mentor additional engineers.

Provides reception, office administration, mail handling, meeting coordination, supply and vendor management, event organization, travel and expense support, facilities coordination, onboarding assistance, and confidential document handling. The role is fully office-based, Monday through Friday, and requires strong organization, communication, customer service, and Microsoft Office skills, along with English and Polish proficiency at B2 level.

Manage end-to-end data engineering, cloud, and machine learning consulting projects for EMEA customers. Responsibilities include defining scope, objectives, budgets, timelines, and resources; coordinating cross-functional teams and stakeholders; managing risks, escalations, and customer communications; improving delivery processes; and ensuring adherence to project management standards and methodologies.

Write and review Spanish marketing and SEO copy for a mental health platform, including articles, therapy pages, landing pages, ads, lifecycle emails, and localized English content. Maintain consistent brand voice, optimize content for search and conversion, collaborate with the Spain Marketing Manager, meet deadlines, and incorporate editorial feedback. Candidates need native Spanish, mental health writing experience, cross-format marketing expertise, SEO skills, strong conversion judgment, and excellent English comprehension.

Lead and mentor a globally distributed engineering team while contributing to coding, architecture, peer reviews, and technical decisions. Design and deliver scalable user-facing systems, promote CI/CD, testing, code quality, and DevOps practices, and improve engineering workflows. Collaborate with product, design, data, and AI specialists to shape roadmaps and integrate personalized learning capabilities. Manage engineers through regular one-to-ones, feedback, and career support.