Job Description

As a Senior Full Stack Developer, you will play a key role in delivering end-to-end solutions across a range of projects. Building high quality user experiences while engineering the systems, APIs and integrations that make them robust, scalable and secure.

You'll work across both front-end and back-end systems, taking ownership of technical delivery from initial discovery through to deployment. You'll collaborate closely with designers, project managers, and clients to translate requirements into scalable, maintainable, and well-structured technical solutions.

You bring strong full-stack fundamentals and confidence with modern development workflows, with clean coding practices and a sharp eye for code quality and long-term maintainability.

This role requires clear, proactive communication and the ability to operate comfortably in ambiguous, fast-moving project environments.

You have a methodical approach to problem solving and a genuine passion for technology and the evolving development landscape.

RESPONSIBILITIES

HANDS ON DEVELOPMENT — Full Stack Development

• Technical ownership of a project from discovery through to implementation
• Collaborate with designers and project managers to translate requirements into technical implementations.
• Write clean, efficient, and maintainable code to create responsive and accessible user front-end interfaces.
• Build and maintain scalable back-end solutions
• Integrate with third-party services and APIs
• Troubleshoot complex issues across the technical stack and propose practical, effective solutions
• Deployment and Simple DevOps tasks as required

TECHNICAL STANDARDS

• Collaborate with designers to ensure creative concepts are executed to spec. With a sharp eye for design fidelity, you care about maintaining visual consistency, polish and motion detail.
• Ensure a high level of technical quality is maintained across projects from discovery to launch.
• Follow best practices consistently across accessibility, security and performance.

TECHNICAL PLANNING

• Liaise directly with clients and other stakeholders as the primary technical contact on a project, to understand their requirements
• Conduct thoughtful research and creative problem solving of technical challenges
• Support architectural decisions by providing input on frameworks, tools, and approaches
• Provide accurate technical estimates, working closely with project managers to develop a detailed delivery plan that accounts for technical dependencies and mitigates risk
• Clear, confident and articulate presentation of appropriate solutions to clients

PASSION & CULTURE

• Excite and engage those around you to bring about the best outcome
• Regularly share best technology practices and inspiration
• Excited by and keen to learn about innovative technologies, such as AI
• Suggest ideas, tools and systems to maximize the effectiveness of our processes and work
• Open to speaking at industry events on panels and raising the profile of Athlon in the public domain

Your experience:

• 6+ years of full-stack development experience, with solid fundamentals across front end and back end

We expect you to be knowledgeable in:

• Frontend languages (e.g. HTML, CSS/SCSS/Tailwind, JavaScript/TypeScript, frameworks like React and Next)
• Backend languages (Node.js or PHP).
• Strong experience in JavaScript/Next.js headless CMS ecosystems, with the ability and willingness to work across both. Exposure to both is highly desirable.
• API Integration (REST, GraphQL)
• GIT workflows, CI/CD automation
• Cloud services (eg. AWS, GCP or Azure)
• Solid understanding of software architecture and system design principles

It is desirable to have:

• WordPress (PHP) experience
• Experience working within a fast-paced agency or client-facing environment, with the ability to work across multiple projects if required
• Evidence of architectural / infrastructure planning with clients and provide ability to lead technical direction
• Full stack / tech agnostic approach - able to work across / adapt to new technologies

Nice to have:

• Animation for web (eg. CSS animations, GSAP, Framer, Motion.js, Lottie etc.).
• Experience leveraging AI tools and structured specs to accelerate delivery without sacrificing quality eg.
  • Claude (claude.ai / Claude Code), Cursor, GitHub Copilot or similar LLM-assisted development environments
  • Spec-driven development — writing structured prompts, technical specs and implementation plan that guide AI-assisted workflows effectively
  • Vibe coding — comfortable using AI to rapidly prototype, iterate and explore solutions in fast-moving creative or technical contexts (prototyping and exploration; production code is always critically reviewed)
• Experience directing / coaching more junior developers