Data Scientist

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 Data Scientist, you will operate at the intersection of Data Science and Service Delivery. Your mission is to turn complex clinical data into clear, high-value reporting solutions. You won’t just be analyzing data in a notebook; you will be developing clean and maintainable code that allows  us to deploy insights into our cloud environment reliably and repeatedly. You are the bridge between raw clinical data and the evidence researchers need.

Who are you

• You have 3+ years of technical experience with a heavy emphasis on Data Science or Analytics Engineering

• You have a proven track record of moving beyond ‘notebook-based’ analysis to building maintainable data products.

• You are comfortable and proficient with AI code generation tools (e.g., GitHub Copilot) to accelerate your delivery.

• You have  a "Product" Mindset. You don't just write queries; you build solutions. You care about how the end-user consumes the data.

• You are database-agnostic. You understand the architectural differences between a relational SQL warehouse and a modern analytical stream like ClickHouse, and you know how to write high-performance queries for both.

• You are committed to quality. You believe that if it isn't tested, it doesn't exist. You are comfortable using Git in a team environment.

• You should be data-base agnostic, comfortable delivering insights whether the data lives in a relational SQL warehouse or a modern analytical stream like Clickhouse.

What you’ll bring

• Extensive Python & SQL fluency.  

• Expert-level Python (Pandas/NumPy) and SQL. Experience with event-stream databases (e.g., ClickHouse) is a significant plus.

• Some experience with cloud applications (GCP/Azure)

• Communication Skills and the ability to clearly explain a complex data transformation to a non-technical Clinical Project Manager.

• Experience delivering visualized insights to end users with modern frameworks like Streamlit or Plotly.

Nice to have: 

• A background in Stats (Biostats would be even better)

• Experience in the HealthTech or Clinical Trials space (familiarity with CDISC, OMOP, or HL7).

• Knowledge of GxP/FDA regulations—you understand why "audit trails" and "reproducibility" matter here.

For this role, we are accepting applications from individuals in Colombia.

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.).