At Castor, we’re modernizing the backbone of clinical research

Clinical trials are the gatekeepers of human health, yet the industry is still bogged down by fragmented, manual processes that can waste time and exclude patient populations. At Castor, we are building the operating system for the next era of clinical research.

We provide a modular cloud platform designed to run trials end-to-end. Our foundation is a robust Electronic Data Capture (EDC) system, supported by eConsent for recruitment and screening and eCOA to accurately capture patient reported outcomes. We don’t just stop at data collection; we use Castor Catalyst (our high-precision AI automation) to strip away the manual effort that historically makes research slow and expensive.

How we work: Trust over tracking

We are a remote-first company built on the belief that talented people do their best work when they have the agency to manage their own lives. We believe that high performance requires a foundation of trust, health, and cutting-edge support.

• Work-life integration: We don't believe in performative presence. We trust you to own your schedule and show up for your team, while also making space for your life outside of work.
• Deep work & async: We protect your time. We prioritize thoughtful, asynchronous communication so you can focus on solving hard problems without a calendar full of status update meetings.
• Radical candor: We value the truth over hierarchy. We give and receive direct feedback because that’s how we grow—as individuals and as a company.
  

Your mission and impact

As a QA Automation Engineer, you own the integrity of our deployment pipeline. You are responsible for developing and maintaining a scalable automation framework. You will architect autonomous testing agents using Model Context Protocol (MCP) and CLI tooling to automate the generation and execution of test scripts. Your impact is measured by the reduction of manual intervention and the speed at which high-quality code reaches production.

Who are you

• You believe that quality is a shared responsibility and thrive on embedding high standards throughout the entire software development lifecycle.
• You enjoy the challenge of building scalable automation frameworks from scratch, moving away from repetitive manual tasks to focus on high-impact technical solutions.
• You value working in cross-functional agile teams, communicating effectively with developers and product owners to resolve complex issues before they reach production.
• You stay ahead of the curve by exploring new tools and methodologies, especially within AI.
  

What you'll be doing

• Architect and maintain a scalable automation framework that supports continuous integration.
• Leverage AI and agentic workflows to effectively reduce manual workload by automating the generation of complex test scripts.
• Implement CI/CD tooling and AI-based agents to perform autonomous browser automation and exploratory testing.
• Actively identify new opportunities to utilize AI for predictive defect analysis and test suite optimization.
• Participate in a centralized Automation Engineering Jira board to pick up and prioritize repetitive tasks identified by the wider QA team.
  

What you'll bring

• Professional experience in software quality assurance, with a heavy focus on automation using tools like Playwright.
• Technical proficiency in TypeScript/JavaScript and building custom CLI tools for automation.
• Hands-on experience with Model Context Protocol (MCP) or similar frameworks for building AI-driven agents.
• Expertise in CI/CD integration (GitHub Actions).
• Experience in claude code (primary tool for maintenance and development).
• Proven manual QA experience and a 'QA mindset' to ensure automation is applied with deep product understanding.
• Strong communication skills to mentor and enable other QA engineers in using AI-driven automation.
  

Our preference is for this role to be based in CET +/-2

How we invest in you

High performance isn't sustainable without real support. We provide the infrastructure you need to stay healthy, focused, and rewarded.

• Rest is non-negotiable: Unlimited annual leave with 25-day minimum. We don’t just allow time off; we expect you to take it.
• Downtime weeks: Once a quarter, the whole company shifts gears. No new shipping—just a week for deep focus, learning, or catching up so we can start the next quarter fresh.
• AI-first culture: We provide the tools and training to ensure you’re spending your energy on high-value work, not manual repetition.
• Real ownership: All Castor team members are offered options through our Employee Stock Option Plan (ESOP).
• Comprehensive wellbeing: Free access to Open Up for mental health, specialized sleep courses (for you and your family), and a budget to make your home office a place you actually want to be.
• Annual bonus: A guaranteed "Happy Holidays" bonus every December.

Belonging at Castor

We build products to make research accessible to everyone, and we believe our team should reflect that same diversity.

Our remote setup is designed to support you as a whole person—your family, your mental health, and your authentic self. We don't care about your background as much as we care about your perspective and your expertise. We strongly encourage applications from women, people of color, and the LGBTQ+ community. Please feel free to share the pronouns you use (for example she/her/hers, he/her/his, they/them/theirs, etc.).