About the Role Our client is seeking a Senior Node.js Developer to join their Accessibility Audit Engine teams.To be considered for an interview, please make sure your application is full in line with the job specs as found below.This is a foundational engineering role at the heart of the platform, responsible for designing and building the systems that power large-scale accessibility audits, rule evaluation, evidence generation, and compliance reporting.This is not a maintenance role.Our client is looking for a senior engineer who sets a high technical bar, challenges assumptions, and helps drive best-in-class outcomes through strong engineering discipline, architectural clarity, and a focus on long-term quality.You will play a key role in shaping core platform capabilities that operate at scale across complex digital estates.Key Responsibilities Core Engineering Design, implement, and maintain high-performance Node.js services supporting accessibility audit engines, rule execution, and reporting pipelines.Build scalable, testable, and observable back-end systems capable of running complex audits across large digital properties.Own core audit logic, including rule orchestration, result normalization, evidence capture, and traceability.Write production-grade code with a strong emphasis on correctness, performance, and maintainability.Architecture & Quality Contribute to system architecture decisions, focusing on modularity, extensibility, and long-term sustainability.Establish and uphold best practices around code structure, error handling, logging, and automated testing.Proactively identify technical debt and lead efforts to reduce it in a structured, sustainable way.Ensure defects are detected early through strong test coverage and disciplined engineering practices.Team & Delivery Act as a senior contributor within Agile / Scrum teams, working in two-week sprint cycles.Collaborate closely with front-end engineers, accessibility specialists, and product leadership to translate requirements into robust technical solutions.Contribute to the continuous improvement of development processes, tooling, and infrastructure.Serve as a technical leader within the audit engine domain, raising standards through example, mentoring, and peer review.Required Experience 5+ years of professional software engineering experience with a strong focus on Node.js.Advanced Java Script expertise and deep understanding of asynchronous programming.Proven experience building and operating production-grade APIs and services.Strong test-driven development (TDD) discipline.Experience working with Jira (or similar) and Git-based workflows.Hands-on experience with AWS, including designing or operating cloud-native services.Experience with LLM prompt engineering.Preferred / Nice-to-Have Experience Knowledge of accessibility standards such as WCAG and ARIA, or experience with rules-based evaluation engines.Experience with distributed systems, background processing, or job orchestration.Familiarity with observability tooling, including logging, metrics, and tracing.Previous work on platform-level or engine-level systems, rather than only application-layer development.
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