Contract Role: Senior Ember.js Engineer Outside IR35 fully Remote

Location: Remote (UK) Duration: 2-3 months Start: 21 st July 2025 Engagement: Outside IR35 5 years plus Ember experience. The Opportunity A well-established financial services product business is looking for a Senior Ember.js Engineer to lead a critical upgrade project across its legacy Ember applications. These applications are part of a wider FX payments back-office platform, with components that have not been updated in several versions and are now reliant on unsupported versions of Ember.js and Node.js. This is a focused engineering engagement. Youll work within a mono-repo ecosystem, modernising the codebase, resolving dependencies, and ensuring successful delivery of a clean, stable, and production-ready upgrade. What is Required. Working closely with internal engineering leadership and DevOps support, you will: Upgrade Ember.js from ~v3.20.5 to Ember 6.x (Octane) . Upgrade Node.js to v20 across all associated packages. Migrate and validate shared packages within a monorepo (Lerna/Yarn Workspaces). Run and maintain comprehensive test coverage (unit, integration, and UAT). Identify and deprecate outdated libraries and plugins. Optionally consolidate common and domain-common packages into a single repo (without impacting delivery timelines) Tech Stack: Frontend : Ember.js (Octane), Glimmer, Handlebars Tooling : Lerna, Yarn Workspaces, ESLint, Prettier Testing : QUnit, qunit-dom, ember-qunit CI/CD : AWS Amplify Auth : Keycloak (OAuth2 integration) Languages : TypeScript, JavaScript Misc : Ember Engines, Babel, Sass, ember-auto-import, ember-fetc Skill-Set Deep experience upgrading and maintaining Ember.js applications (ideally 3.x ? 5.x/6.x). Solid grasp of Node.js environments and version migrations (especially v20). Familiarity with monorepo structures , including Lerna and Yarn Workspaces. Experience working with Ember Engines and component libraries. Strong testing mindset youve worked with QUnit or equivalent test runners in Ember. Good communicator able to work autonomously and update stakeholders clearly. Deliverables Technical Upgrade Plan Comprehensive Test Plan and Cases Clean builds and validated UAT release Post-upgrade performance and stability report

Location: Reading, South East, GB

Posted Date: 7/14/2025