Senior Software Engineer:  Clinical Data Platform Wellsheet at Elsevier

About the team The Platform squad runs the machinery underneath everything clinicians see: real-time EHR sync across Epic, Cerner, and Athena, FHIR ingestion for 100+ hospitals, and vocabulary normalization across 125+ clinical terminologies. The squad is led directly by the technical leader behind Wellsheet's platform. Its next major build, which you'll help kick off, is the platform API that other Elsevier clinical products and internal teams will consume. The squad also owns the internal tooling for managing the platform and the health of the stack itself, from framework upgrades to developer tooling.

Our stack today is Ruby on Rails with Sidekiq on AWS (ECS, Aurora PostgreSQL), with a TypeScript frontend where our tools need one. The work is mostly backend, but internal tools need real interfaces, and this squad builds its own. We don't require prior experience in any of the stack.

About the role You will build the platform API alongside the squad lead: own endpoints, contracts, and the extraction work that turns internal seams into a real interface. You will also be building the internal tooling for managing the platform, frontends included: vocabulary mapping, data quality, hospital onboarding, and the operational views that let a small team run 100+hospitals

Responsibilities

• Owning platform subsystems end to end: ingestion pipelines, sync reliability, normalization.
• Keeping the stack healthy: major framework and dependency upgrades, developer tooling, and the CI that keeps a small team fast.
• Taking of loosely specified problems ("this vendor's FHIR implementation does something strange under load") through diagnosis, design, and durable fixes.
• Keeping correctness and observability strong as the platform takes on new consumers.
• Pair with the engineer who built our sync and normalization systems and take ownership of one production pipeline, including its on-call. Your first shipped work will be a piece of the platform API or the internal tooling around it. By month three you'll own a platform surface that other teams depend on.

Requirements

• Current development skills with Ruby on Rails with Sidekiq on AWS (ECS, Aurora PostgreSQL), with a TypeScript frontend.
• Possess backend fundamentals: queues, retries, transactions, and the failure modes between them.
• Have real depth in SQL and relational data modeling, and the instinct to check the query plan.
• Possess End-to-end ownership of production systems, including the unglamorous parts.
• Have a debugging temperament: patient, methodical, happy in logs.
• AI-assisted development as a default: coding agents and spec-driven development are already part of how you work

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