Portfolio Software Full Stack Engineer; Contractor

The Opportunity

This is an exciting opportunity for a skilled Full Stack Software Engineer to join our Portfolio Team, providing the critical engineering expertise needed to develop and evolve our internal tools and services.

You’ll play a pivotal role in designing, implementing and maintaining scalable backend systems and supporting the applications that enable decision-making across the organisation.

The Portfolio Team drives and influences how Arm’s product strategies come to life.

We are seeking a skilled Full Stack Software Engineer with a strong backend and platform focus to join our team on a contract basis.

The ideal candidate will have extensive experience building backend services using Node.js and Type Script , with a strong understanding of modern software engineering practices, distributed systems and API design.

While this is a full stack role, the primary emphasis is on backend development, system architecture and code quality
. Experience with frontend technologies is beneficial but not essential.

The successful candidate should also be comfortable working with AI-assisted development tools
, reviewing both human-written and AI-generated code, and contributing to technical discussions around architecture and system design.

• Design, develop and maintain scalable backend services using Node.js, Type Script and modern backend frameworks such as Express.js or similar.
• Design and implement RESTful APIs and service integrations.
• Develop maintainable, well-tested and performant code following engineering best practices.
• Design data models and work with relational and No
  
  SQL databases where appropriate.
• Improve application reliability, observability and performance through monitoring, logging and optimisation.

• Write clean, maintainable and well-documented code following established coding standards.
• Perform thorough code reviews and provide constructive technical feedback.
• Review and validate AI-generated code
  , ensuring correctness, maintainability, security and adherence to engineering standards.
• Contribute to improving development workflows, automation and engineering best practices.

• Participate in technical design discussions and contribute to system architecture decisions.
• Translate business requirements into scalable technical solutions.
• Collaborate closely with frontend developers, product owners and other engineers to deliver high-quality software.
• Contribute to technical documentation and knowledge sharing across the team.

• Leverage modern AI-assisted development tools to improve engineering productivity.
• Evaluate the suitability of AI-generated implementations and identify potential issues or improvements.
• Stay current with emerging AI development tooling and software engineering practices.

• Strong proficiency in Node.js development using Type Script and modern JavaScript (ES6+).
• Experience designing and implementing RESTful APIs and backend services
  .
• Strong understanding of software engineering principles, clean code practices and maintainable application architecture.
• Experience reviewing and improving code written by other engineers.
• Familiarity with AI-assisted software development tools
  , such as Git Hub Copilot, ChatGPT, Claude or similar, and the ability to critically assess AI-generated code.
• Solid understanding of software architecture and system design concepts
  .
• Experience working with relational and/or No
  
  SQL databases
  .
• Familiarity with version control systems (Git) and modern development workflows.
• Strong problem-solving skills and attention to detail.
• Excellent communication skills and the ability to work in a collaborative,…