377 English-speaking jobs in Castile and León

Build and operate production backend services using TypeScript/Node for a multi-tenant API platform. Own features end-to-end, designing scalable API contracts, managing Postgres data, and building integrations.

Ship end-to-end TypeScript features across a multi-tenant platform, designing Hono APIs and building React UIs. Requires 5+ years building production web products with strong product and technical judgment.

Political Consultant needed for high-level political and economic analysis in Spain. Support policy advisory work by producing analysis on governance, regulatory strategy, and geopolitical positioning. Requires expertise in public policy and Spanish institutional dynamics.

Lead QA for a AAA game development team, defining global QA strategy and managing embedded testing teams. Oversee execution across functional, performance, and platform certification areas. Requires 7+ years in software QA with 3+ years managing teams in game development.

Experienced Performance Marketer needed to run and scale international paid campaigns for a global luxury fashion brand. Responsibilities include optimizing Meta, TikTok, Google, and Pinterest campaigns to drive e-commerce revenue.

Senior Software Engineer to shape the core architecture of a Fintech Platform. Build, optimize, and scale backend microservices within Payments, Disbursements, or GRC squads. Requires 5+ years of experience and a strong foundation in algorithms and data structures.

Experienced Full Stack Engineer needed for a 12-month contract supporting telecom BSS applications. Develop and maintain using TypeScript, Node.js, React, and PostgreSQL, managing deployments on Kubernetes via GitHub Actions.

Senior AI Engineer for a fast-growing FinTech. Design and deliver production-grade AI solutions, integrating advanced AI into core products. Requires experience with LLMs, Generative AI, RAG, and MLOps.

Senior Tax Advisor for a Family Office specializing in international tax structuring and UHNW personal taxation across the UK and Spain. Leads end-to-end tax strategy, optimizing cross-border structures and managing regulatory risk.

Map and document business processes for application modernization, analyzing legacy and mainframe systems. This role requires 3+ years in business process mapping, systems engineering background, and experience in client-facing consulting.

Apply BPM discipline to application modernization by mapping legacy and mainframe systems for cloud re-architecture. Requires 5+ years in BPM or business process mapping and systems engineering.

Commercial Leader responsible for developing and growing the Northern sales area. This role involves achieving sales targets, managing customer relationships, and introducing new products in the medical diagnostics industry.

Lead Programmer for Cluepoints as a Centralized Monitoring Analyst. Requires 3+ years in pharma R&D, 2-3 years SAS experience, and knowledge of Cluepoints. Focuses on platform setup, programming, and process execution.

Experienced Team Leader needed to guide software engineers in designing and developing cutting-edge solutions. Responsibilities include technical leadership, mentoring, and ensuring high-quality, scalable code delivery. Requires 7+ years of development experience with 2+ years in a lead role.

Senior Infrastructure Optimization Specialist - AI Trainer role. Review and enhance AI-generated content on infrastructure optimization and systems architecture. Assess technical accuracy and operational viability of AI-driven scenarios. Requires IT infrastructure expertise and availability for 8–20 hours weekly.

Freelance Quantitative Modeler – AI Trainer role for experienced modelers in the EU/UK. Review AI outputs, assess modeling scenarios, and shape AI reasoning for quantitative logic. Requires 8–20 hours weekly.

Freelance System Operations Engineer - AI Trainer role for experienced professionals in the EU/UK. Review, refine, and train AI on system operations, automation, and reliability challenges. Requires expertise in complex IT systems.

Freelance Process Engineering Consultant - AI Trainer role. Enhance AI models using process optimization and engineering expertise. Review AI outputs, evaluate recommendations, and develop real-world scenarios. Requires EU/UK based consultant.

Freelance VP Sales AI Trainer needed to train AI models in real-world sales strategy. Review AI content, assess sales scenarios, and develop training exercises based on B2B/B2C sales expertise. Requires senior sales leadership in the EU or UK.

Experienced M&A consultants are needed to review and refine AI-generated content on deal sourcing, due diligence, and valuation. This freelance role requires 8–20 hours weekly to enhance AI's understanding of real-world M&A practice.