PowerUp is a performance intelligence platform, inspired by elite sports. Just as world-class athletes rely on data and coaching to reach peak performance, we help employees, teams, and organisations do the same. By uncovering and addressing the root causes that hold people back, PowerUp’s software delivers highly personalised, data-driven insights and actionable solutions that drive measurable business impact – boosting outcomes like sales growth, AI adoption, employee retention, burnout reduction, and risk management.
In this role, you’ll work end-to-end across our web and mobile applications, internal telemetry pipelines, and customer-facing intelligence dashboards. You’ll collaborate closely with our CTO to build secure, scalable systems that will support rapid growth - and help set the foundation for an engineering team as we expand.
PowerUp is building toward an agent-first architecture where AI becomes the primary interface for users. You'll help ensure our applications can surface data to AI agents, support conversational interactions, and integrate with AI services.
What you’ll do:
Design, implement, test, and maintain features end-to-end across frontend, backend, services, and supporting data layers
Build and evolve secure, scalable APIs and microservices
Ensure robust data flow and integrations between systems, including ingestion and processing pipelines
Contribute to architectural decisions with a focus on scalability, security, reliability, and customer experience
Implement and improve engineering processes including code reviews, test coverage, documentation, and deployments
Help set engineering standards, especially as the team grows
Improve and extend existing systems as well as building new features – we value developers who read and understand code before rewriting it
Required
Proven experience in full-stack development
Strong expertise with Next.js, React + TypeScript
Familiarity with iOS and Android mobile development (React, Native or similar)
Solid backend experience with Node.js, python and/or Ruby
Experience working with cloud environments (Azure strongly preferred)
Comfortable with fast-paced, ambiguous startup environments where priorities evolve quickly
Experience writing unit and integration tests, working with CI/CD, and automating deployments
Knowledge of secure coding practices and modern API security approaches
Excellent autonomy, ownership, and communication skills in a remote-first team
Professional English proficiency (B2+ level)
Preferred
Experience with Microsoft Data Platform components
Experience with the Microsoft Azure App Service or similar cloud web platform.
Experience integrating applications with LLM APIs (OpenAI, Claude, Gemini), SLMs or building lightweight agentic workflows. Understanding of how applications feed context to AI agents (RAG patterns, MCP servers, function calling).
Understanding of UX principles, ability to work from Figma, and comfort translating user behaviour into intuitive UI
Experience scaling systems to handle growth in users, data, or traffic
Exposure to NoSQL databases (MongoDB) or experience supporting data migrations
Why PowerUp
Remote-first, flexible working environment.
A rare opportunity to join a high-potential start-up and directly influence product, technical direction, and culture.
High ownership: your ideas will meaningfully shape the company’s trajectory.
A team culture that values passion, autonomy, continuous learning, and collaborative problem-solving.
A chance to build cutting-edge AI systems with meaningful real-world impact.
The opportunity to shape your own career path as our team and product scale.
Details:
Start date: ASAP
Contract Duration: 3 months Contractor/FTE probation period before FTE
Location: Valencia, Spain. May be located elsewhere in Spain, under review.
Competitive salary, with bi-annual salary reviews
Annual performance bonus
High growth career trajectory
Job Type: Full-time
Pay: 35,000.00€ - 50,000.00€ per year
Work Location: Remote