Senior Product Engineer

Oliva is the employee mental wellbeing & coaching platform for companies who want to properly care for their people, and help them grow.

By combining proper therapy courses, coaching, team sessions—all led by a curated team of top professionals—Oliva helps employees respond to whatever hurdles life throws at them: big or small, at work and beyond.

We've raised funding from some of Europe's best venture capital firms and various top-notch angels. And now, we're looking for a top notch Senior Product Engineer to embark on this journey with us.

This isn't just any job. We want to make a meaningful impact on an industry that changes people’s lives. The ideal candidate is not only an experienced Product Engineer, but also someone who’s passionate about joining our mission.

The role:

Help shape the future of mental well-being. Oliva provides a powerful toolkit combining AI and expert human coaching, empowering companies and individuals to achieve peak performance and thrive. Backed by leading European VCs and prominent angel investors, we're seeking an exceptional Senior Product Engineer to join our mission.

This is more than a job. It's a chance to build technology that genuinely transforms lives. We're looking for an experienced engineer passionate about reimagining how people and organizations reach their full potential. If you're driven to make a tangible positive impact, read on.

As a Senior Product Engineer at Oliva, you'll be at the intersection of product innovation and cutting-edge AI. You will take a crucial part in the development of our mental health solutions, translating user needs and the potential of AI into robust, scalable features. You'll have significant ownership across the entire development lifecycle, from ideation and rapid prototyping through to deployment and iteration.

Working closely with product and design counterparts, you'll act as a key technical voice, not only architecting and building systems but also contributing to the strategic direction of our AI-powered capabilities. Your work will span our full technology stack, allowing you to directly influence the user experience and the well-being of those we serve.

Ideally you will be based in Barcelona or London but for the ideal candidate we could consider remote within Spain or the UK if you are willing to travel.

You´ll make an impact in the following areas:

• Architecting & Building Scalable Backends: Design and implement cloud-native backend systems (AWS Lambdas, PostgreSQL Aurora) capable of supporting thousands of concurrent users, primarily using TypeScript and GraphQL (Nexus, Apollo Server, Relay), and FastAPI in Python.
• Developing Performant Frontend Experiences: Utilize modern component-based frameworks (React, React Native, NextJS) and design systems (TailwindCSS) to build highly performant, intuitive user interfaces in TypeScript.
• Integrating Advanced AI Capabilities: Explore, evaluate, and integrate LLM APIs (OpenAI, Claude, open-source models) and leverage agent frameworks (e.g., LangChain) to create sophisticated, multi-step AI interactions with memory, planning, and tool use.
• Designing Intelligent Data Flows: Potentially utilize graph-based data structures (e.g., Neo4j) to structure information for richer AI reasoning and context.
• Building Adaptive AI Systems: Engineer performant systems that combine generative AI with real-world user data, creating adaptive feedback loops and personalized experiences, using Python for AI code and integrations.
• Championing Data Privacy & Security: Uphold the highest standards of security and privacy in system design and implementation to protect sensitive user information.
• Collaborating Cross-Functionally: Partner closely with design and product teams to rapidly prototype, iterate, and ensure technical solutions align directly with user needs and business objectives.
• Ensuring Application Quality: Implement comprehensive testing strategies (unit, integration, e2e using Jest, React Testing Library, Playwright) to guarantee application reliability and performance.
• Fostering Engineering Excellence: Contribute to a strong engineering culture through Agile practices, clear documentation, thorough testing, and continuous integration.

Who You Are

You are an accomplished and versatile Full-Stack Engineer with a strong track record of shipping high-quality software in a production environment. You excel in fast-paced, collaborative settings and are comfortable navigating ambiguity.

You possess a strong engagement with and passion for the potential of AI, particularly LLMs. You have demonstrable experience exploring or experimenting with AI/ML concepts and tools (e.g., utilising APIs, building prototypes, contributing to open-source AI projects) and are eager to apply these technologies to build meaningful, user-centric solutions.

You're not just looking for another SaaS role; you are fundamentally motivated by the opportunity to use your technical skills to create products that have a positive and tangible impact on people's mental well-being.

Requirements:

• Demonstrated understanding of LLM capabilities, applications, and the evolving AI landscape, gained through hands-on experimentation and exploration (e.g., working directly with APIs, building prototypes, testing different models).
• Proven experience working effectively in fast-paced startup or scaleup environments, and shipping production software as part of an agile team.
• Strong proficiency in JavaScript/TypeScript and experience applying it across the full stack.
• Excellent communication skills in English (written and verbal).
• Experience building modern user interfaces with React (React Native proficiency is a significant plus), ideally utilizing design systems.
• Familiarity with cloud platforms (AWS strongly preferred) and building cloud-native applications.
• Solid understanding and practical experience in designing and implementing secure systems or systems handling sensitive data.
• Ability to translate AI concepts and capabilities into practical product features, integrating relevant APIs, models, or frameworks (like LangChain).
• An independent, pragmatic approach to problem-solving, balancing feature delivery with system stability.
• Familiarity with Python, particularly its libraries and common use cases within the AI/ML domain (data processing, model interaction, backend scripting and API integrations), OR a strong aptitude and eagerness to quickly become proficient in Python for these purposes.
• While deep AI specialisation is a valuable asset, a practical foundation built on hands-on exploration and a strong drive to learn and build using AI are essential for this role.
• Are based in the UK or Spain, if you live near London or Barcelona you should be happy to go to our hub offices on average twice a week.
• Are happy to travel to off-sites and team events.

Benefits:

• A healthy salary and early-employee stock options.
• Plenty of paid time off to relax and recharge your batteries, approximately 38 days of leave including your local public holidays.
• Private international medical insurance.
• Therapy and coaching via the Oliva platform — and encouragement to take advantage of it.
• An autonomous, vibrant, and flexible work environment.

Diversity & Inclusion

We know the tech industry has a diversity problem. Without proactively addressing this, we could easily end up hiring a lot of very similar people. So we’re enthusiastically encouraging applications from underrepresented groups in our industry. We hire with fairness and awareness—and we mean it.

Whoever you may be: regardless of age, ethnic origin, sexual orientation, gender, religion, disability, background, or identity, we’d love to hear from you. If you need any adjustments during the interview process, let us know and we’ll accommodate.

Who we are

Oliva is a tight-knit, experienced, and passionate team of engineers, designers, marketers, and psychologists. We’ve all been through our own battles with burnout, anxiety, low self-esteem, and depression. And while we’ve all had both positive and less positive experiences with mental healthcare, we know first-hand that talking through your problems makes a massive difference once you find the right person.

Our co-founders, Javier Suarez, Sançar Sahin and Huw Slater, have all experienced the emotional highs and lows of scaling successful tech startups and lived to tell the tale. Between them they have founded or led teams at TravelPerk, Typeform, Hotjar, and GetApp.

You will need to be based in the UK or Spain for all our positions. Unfortunately at the moment we are unable to sponsor working permits or visas.