Top Tech Jobs & Startup Jobs in Barcelona

Own paid acquisition growth across EU, LATAM, and APAC markets. Prioritize and launch channel tests, manage budgets and partners, evaluate CAC, ROAS, incrementality, cohort quality, LTV, and payback, then scale successful campaigns. Collaborate with creative, product, data, and MarTech teams on messaging, landing pages, tracking, signup, funding, and customer activation. Localize strategies by market and share learnings across the performance marketing team.

Own the strategy, design, prototyping, launch, and optimization of social investing and trading experiences. Define user journeys, interaction details, experiments, and success metrics; conduct usability research; analyze funnel and retention data; collaborate with design, engineering, and data science; and prioritize improvements across feeds, profiles, sharing, discovery, and community features.

Build front-end experiences and backend services for integrating prediction markets into MetaMask. Develop scalable APIs, real-time data feeds, transaction signing, and secure on-chain protocol integrations. Optimize performance, security, and high-volume transaction throughput across mobile, web, and browser clients while collaborating within an agile, distributed engineering team.

Build the companys first data stack and data products (internal analytics and customer-facing). Work across data engineering, devops, and software tasks; ship early features, improve developer experience, document proposals, and iterate based on feedback.

Generalist full‑stack engineer who ships product features, collaborates remotely, improves developer experience, writes proposals and documentation, and iterates quickly in an early‑stage environment using TypeScript/Next.js and Golang.

Lead product compliance reviews for new products, features, market expansions, and material changes across OKX’s global crypto business. Assess regulatory, AML/CFT, sanctions, KYC, consumer protection, financial promotion, market conduct, safeguarding, privacy, and third-party risks. Partner with Product, Engineering, Legal, Risk, and Compliance teams to define controls, document decisions, support launches, monitor post-launch risks, and promote compliance-by-design.

Owns full-cycle recruiting across engineering and non-technical teams, including intake, sourcing, interviewing, offers, and candidate experience. The role also builds talent communities, supports employer marketing, advises hiring managers, tracks hiring metrics, improves interview processes, and maintains compliant hiring workflows across countries. This is a fully remote role for someone based in Europe or the UK who can regularly overlap with US hours.

Leads technical discovery, solution design, and complex SaaS implementations for enterprise clients. Owns API, data feed, and FTP integration troubleshooting; provides platform training and technical consultation; coordinates with Sales, Product, Engineering, and Client Success; mentors junior team members; develops enablement materials; improves processes; advocates for clients; and uses AI to improve documentation, research, automation, and delivery outcomes.

Build reusable AI developer tools, RAG knowledge systems, and AI-assisted SDLC workflows. Integrate coding assistants and design-to-code tooling, define secure observable patterns, and own reliability, usage, and cost for internal AI platforms.

Lead analytics for subscription products and web funnels, partnering with Product, Marketing, and Data teams to improve conversion, retention, and LTV. Build trusted dashboards, SQL data models, event tracking structures, funnel and cohort analyses, and A/B testing insights. Monitor metrics, identify anomalies, communicate recommendations, and mentor junior and mid-level analysts while maintaining reliable reporting and data foundations.

Own end-to-end product and marketing analytics for subscription products and web funnels. Define KPIs, build trusted dashboards and reusable SQL data models, analyze funnels, cohorts, retention, LTV, churn, and user behavior, and identify optimization opportunities. Maintain event tracking and taxonomy, monitor anomalies, communicate insights to stakeholders, and mentor junior and mid-level analysts. Collaborate cross-functionally with Product, Marketing, Data Engineering, and BI teams to support experimentation and data-driven decisions.

Own end-to-end conversion rate optimization, including funnel analysis, hypothesis generation, UI/UX mockups, experiment testing, developer collaboration, statistical analysis, and rollout decisions. Build testing roadmaps, document learnings, benchmark competitors, and present results to stakeholders. The role targets 15% quarterly conversion growth and requires accountability for measurable performance outcomes, particularly across subscription or SaaS funnels.

Support Upway’s launch and growth in Denmark by driving website traffic, building brand awareness in Danish e-bike culture, developing local partnerships, and sharing customer insights with the broader marketing team. The role offers significant ownership in a new market and requires creativity, independence, Danish and English fluency, and interest in marketing, sustainability, or urban mobility.

Build and maintain scalable full-stack cloud applications using Effect-TS and Node.js. Participate in product ideation, design, development, release, and maintenance while collaborating with cross-functional teams. Establish engineering practices including testing, code review, and pair programming; automate cloud services and configuration management; improve performance, quality, security, and operational efficiency; and mentor teammates while influencing product decisions.