Application Engineer

James Adams; Greater London; Hybrid; GBP 36,000 - 44,000; Full time

Job summary

James Adams in Central London seeks an Applications Engineer to own and evolve three core internal web applications, ensuring performance, reliability and usability. You will work alongside the Head of Digital Transformation and a Senior Developer, implement new features, optimise state management, authentication and localisation for future international expansion, while embracing AI‑assisted tooling.

The role emphasizes collaboration with non-technical stakeholders and a focus on scalable,

Qualifications

• Experience owning and maintaining complex web applications.
• Strong understanding of application architecture and performance optimisation.
• Experience with authentication and multi-user systems.

Responsibilities

• Take ownership of three business-critical internal web applications.
• Maintain, enhance and support existing functionality, resolving bugs, performance issues and technical debt.
• Design and implement new features based on business requirements and user feedback.
• Work on authenticated, multi-user business applications, ensuring reliability, performance and scalability.
• Continuously improve usability and accessibility.

Skills

AI-assisted tools

Own and maintain complex web apps

Application architecture & performance

RBAC / authentication systems

Caching & automated testing

Localization / internationalization

Debugging & problem-solving

Stakeholder communication

Job description

Location: Central London (Hybrid, 3 days onsite)

Salary: Up to £40,000

Our client is looking for an Application Engineer to take ownership of a suite of business-critical internal web applications.

Working alongside the Head of Digital Transformation & Change and a Senior Developer, you'll become the technical owner of three core internal applications, maintaining, enhancing and evolving the platforms while ensuring they remain performant, reliable and easy to use.

Responsibilities

• Take ownership of three business-critical internal web applications.
• Maintain, enhance and support existing functionality, resolving bugs, performance issues and technical debt.
• Design and implement new features based on business requirements and user feedback.
• Work on authenticated, multi-user business applications, ensuring reliability, performance and scalability.
• Continuously improve usability, accessibility and overall user experience.
• Prepare the applications for international expansion, including localisation, translations and jurisdiction-specific workflows.
• Collaborate closely with business stakeholders to deliver practical, user-focused solutions.
• Leverage AI-assisted development tools as part of your day-to-day engineering workflow.

Technical Skills

• Experience using AI-assisted development tools to improve engineering productivity is essential.
• Experience owning and maintaining complex web applications.
• Strong understanding of application architecture, state management and performance optimisation.
• Experience working with authenticated, multi-user business applications.
• Excellent debugging and problem-solving skills.
• Comfortable working closely with non-technical stakeholders.
• Experience with authentication, RBAC or permission-based systems.
• Experience with caching, automated testing and performance optimisation.
• Exposure to localisation or internationalisation.

What We're Looking For

Candidates with experience building and owning complex, authenticated applications, coupled with a passion for AI-assisted development, will be particularly well suited to this opportunity.