Senior Fullstack Developer, Data Foundations
Fullscript
Software Engineering
Toronto, ON, Canada
Posted on Dec 7, 2025
About Fullscript
We’re an industry-leading health technology company on a mission to help people get better. We started in 2011 with one simple idea. Make it easier for practitioners to access the products they trust so they can deliver better care.
That simple idea grew into a platform that powers every part of care. Today, more than 125,000 practitioners use Fullscript for clinical insights, lab interpretations, patient analytics, education, and access to high-quality supplements. Over 10 million patients rely on Fullscript to stay connected to their care plans and follow through on treatment.
We build tools that make care smarter and more human. Tools that save time, simplify decisions, and help practitioners stay closely connected to the people they care for. When everything they need is in one place, they can focus on what matters most: helping people get better.
This is your invitation.
Bring your ideas, your grit, and your care for people.
Join us and shape the future of care.
The Hercules team builds the backbone of Fullscript’s data ecosystem; everything from the services, models, and tooling that make sure the right data reaches the right systems in the right shape. We’re the group that keeps the platform upright: reliable, efficient, and able to scale as the business grows.
We’re hiring a Senior Fullstack Developer to join this team. You’ll work in our profile and audience lane, where customer, product, and marketing data come together to power personalization and insight across the platform. This role is a fit for someone who loves creating well-designed systems, building reusable tooling, and partnering closely with technical and non-technical teams to ship solutions that last.
You’ll write production-grade backend and fullstack code, shape foundational architecture, and build the packages and SDKs other engineers rely on. You’ll operate with autonomy, collaborate across domains, and bring clarity, curiosity, and good judgment to a space that grows more important every quarter.
This is a hands-on engineering role, not a pure data role. You’ll work deeply across backend services, developer tooling, event-driven systems, and the infrastructure that moves and shapes data at scale.
What you’ll do
- Design and build backend services that support event ingestion, identity stitching, profile creation, and downstream activation.
- Develop SDKs, packages, and reusable components. As well as publish them internally or externally to support instrumentation, governance, and developer experience.
- Build internal tools and fullstack workflow surfaces that help teams understand, use, and trust the data flowing through their systems.
- Improve data flows end-to-end for correctness, performance, and scalability.
- Collaborate with PMs, analysts, marketers, and engineers across multiple teams to define requirements and shape solutions.
- Validate pipelines and event streams, identify issues, and drive resolution.
- Work with senior engineers on architectural initiatives around storage, lineage, schema design, and event modeling.
- Write clear, maintainable, well-tested code (and contribute to the patterns and standards that keep our systems healthy).
What you bring
- 5+ years of software development experience with a strong focus on backend and fullstack systems.
- Proficiency in Ruby or another modern backend language (Go, Python, TypeScript, etc.).
- Experience building APIs, services, or ingestion systems that handle data at scale.
- Strong SQL skills and comfort with data modeling, query optimization, and schema design.
- Familiarity with event-driven architectures and tools such as Snowflake, Kafka, Rudderstack, Segment, or similar technologies.
- Experience building reusable libraries, packages, or SDKs intended for other developers.
- Comfort collaborating across disciplines (engineering, analytics, product, marketing, etc) and bringing clarity to complex problems.
- Ability to work independently in an async-friendly environment with clear direction but minimal supervision.
- A low-ego, team-first mindset. You communicate well, listen well, and don’t create friction.
Bonus if you have
- Experience contributing to open-source projects or publishing packages to public registries (npm, RubyGems, PyPI, etc.).
- Experience with Snowflake or other large-scale cloud data warehouses.
- Familiarity with GraphQL APIs or schema design.
- Background in instrumentation, observability, or developer experience tooling.
- Experience in SaaS, eCommerce, or health tech environments.
What we can offer you
- Ability to work Wherever You Work Well*
- Flexible Paid Time Off program
- Fullscript’s RRSP match program
- Stock Options
- Custom benefits package (medical, dental, vision) with HSA
- Discount on Fullscript catalog of products for family & friends
- Training budget and company-wide learning initiatives
- Employee Wellness Programs
Why Fullscript
Great work happens when people feel supported, trusted, and inspired. At Fullscript, we stay curious and keep finding smarter ways to make care better. We grow together, take on new challenges, and focus on impact. We put people first, work as a team, and leave egos at the door.
What to Know Before You Apply
We’re grateful for the interest in joining Fullscript. To make sure your application reaches our hiring team, please apply directly through our careers page. We’re not able to respond to individual messages about open roles on email or social channels.
Fullscript is an equal opportunity employer committed to creating an inclusive workplace. Accommodations are available upon request at accommodations@fullscript.com.
All offers are contingent on successful background checks conducted in compliance with federal, state, and provincial laws.
We use AI tools to support parts of the hiring process, including screening and reviewing responses. Final hiring decisions are always made by people and follow all applicable privacy and employment laws in Canada and the U.S.
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