Senior Software Engineer I - Ruby on Rails with Sidekiq

Elsevier; City Of London; On-site; GBP 89,000 - 111,000; Full time

Benefits offered by this job

Annual incentive bonus

Job summary

Elsevier Wellsheet is hiring a Senior Software Engineer to join a flagship clinical data platform. You will own platform APIs and internal tooling, focusing on real-time EHR integration and robust data normalization for 100+ hospitals.

You will work primarily on Ruby on Rails back-end services, with TypeScript frontend work as needed, in a small senior team that ships to hospital clients starting in 2027. Prior healthcare background is not required.

Qualifications

• Strong Ruby on Rails experience with Sidekiq on AWS.
• Solid SQL and relational data modeling.
• End-to-end ownership of production systems.
• Debugging temperament and logs-focused troubleshooting.
• Experience with AI-assisted development is a plus.

Responsibilities

• Own platform subsystems end to end: ingestion pipelines, sync reliability, normalization.
• Keep the stack healthy: framework and dependency upgrades, developer tooling, CI.
• Tackle loosely specified problems through diagnosis, design and durable fixes.
• Maintain correctness and observability as the platform grows to new consumers.
• Pair with the engineer who built the sync/normalization systems and own a production pipeline.

Skills

Ruby on Rails

Sidekiq

AWS

TypeScript

SQL

End-to-end ownership

AI-assisted development

Tools

ECS

Aurora PostgreSQL

Job description

Senior Software Engineer: Clinical Data Platform · Wellsheet at Elsevier

About Wellsheet at Elsevier: Wellsheet is a clinical decision support platform used by more than 20,000 providers across 100+ hospitals. We embed directly in the EHR (Epic, Cerner, Athena) and put AI-generated clinical context in front of clinicians at the bedside. In 2026 Wellsheet became part of Elsevier's Clinical Solutions group, and we're now building the next generation of our product: a new clinical AI experience shipping to our first hospital clients in early 2027, backed by an integration platform we've run in production for years. We're a small, all-senior engineering team. You'll own real surface area from your first weeks, work directly with the people who built the system, and ship software that clinicians use during patient care. No healthcare background is required. We train the clinical and interoperability domain; we hire for engineering judgment.

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

Elsevier is a renowned global information analytics company that primarily focuses on providing scientific, technical, and medical (STM) research content, tools, and services. It is one of the largest publishers of academic journals and scholarly literature in the world. Elsevier operates in various domains, including science, technology, medicine, social sciences, and more. They publish a vast number of peer-reviewed journals covering a wide range of disciplines. These journals act as platforms for researchers and academics to share their findings and contribute to the advancement of knowledge in their respective fields.

U.S. National Base Pay Range: $86,600 - $144,400. Geographic differentials may apply in some locations to better reflect local market rates.

If performed in New York, the base pay range is $95,300 - $158,900.

If performed in New York City, the base pay range is $103,900 - $173,300.

If performed in Rochester, NY, the base pay range is $86,600 - $144,400.

This job is eligible for an annual incentive bonus.

We are an equal opportunity employer: qualified applicants are considered for and treated during employment without regard to race, color, creed, religion, sex, national origin, citizenship status, disability status, protected veteran status, age, marital status, sexual orientation, gender identity, genetic information, or any other characteristic protected by law.

USA Job Seekers: EEO Know Your Rights.