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Agency
Critical Mass
Job Function
Technology
Job Subfunction
Software Development
Job Description
Tribal is a creative force that blends strategy, design, and technology, and we are on the hunt for a talented and experienced Senior Developer who is equal parts craftsperson, collaborator, and tech trailblazer to elevate our London-based team! As a Senior Front-End Developer (SFED), you’ll help shape digital experiences from bold marketing sites to interactive web applications, bringing both creative flair and technical excellence to everything you touch and the code you produce.
In this role, you will work with a team of creative individuals while also collaborating closely with your Tech Lead to provide insightful solutions and accurate estimates for your tasks. You’ll immerse yourself in a diverse array of front-end technologies, including REACT, HTML5, CSS, and JavaScript, and you’ll be right at home with content management systems.
You Will
- Develop web applications that follow the latest web standards and conform to leading-edge front-end technologies
- Work closely with the Creative, Business, Technology, and QA teams to ensure the solution meets the requirements and performance targets (mobile and desktop).
- Own the development of web applications and ensure they follow the overall technical architecture and design established by the technical lead
- Implement user and business requirements, which are composed of multiple development activities
- Maintain up-to-date and complete documentation on projects as dictated by the capability’s guidelines and best practices
- Debug or troubleshoot complex issues in existing web applications
- Proactively provide feedback on policies and procedures when an opportunity for improvement exists
- Proactively provide guidance and support to other members in fulfilling their tasks and improving their performance and overall technical skills.
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You Have
- 5+ years of professional front-end development experience with expert-level React and JavaScript/TypeScript proficiency
- Strong understanding of modern CSS (CSS Modules, styled-components) and solid grasp of web fundamentals (semantic HTML, responsive design, performance optimization)
- Experience with modern build tools and bundlers (Vite, Webpack, etc.), proficiency with Git and CI/CD workflows (GitHub Actions/Workflows)
- Testing experience (unit tests, integration tests, e2e tests with tools like Jest, React Testing Library, Cypress/Playwright)
- Accessibility best practices (WCAG, ARIA) and SEO fundamentals
- Experience integrating frontend with external APIs and backend services
- Familiarity with data formats (JSON, REST, GraphQL), knowledge of authentication and secure data handling
- Experience with Supabase or similar backend-as-a-service platforms
- State management experience (XState, Zustand, or similar libraries)
- Component library or design system work
- AWS or similar cloud platform familiarity
- Experience mentoring junior developers
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You May Have
- Experience in Python
- Proficiency with LLMs, Pydantic, LangChain/LangGraph or similar orchestration tools
- Familiarity with AEM
Omnicom’s policy requires employees to work in the office for a minimum of three days a week, unless additional in-office days are directed by their agency or manager. Our objective is to increase this requirement over time, and many of our agencies as well as Omnicom’s corporate group already require five days of in-office attendance.
Omnicom is committed to hiring and developing exceptional talent. We agree that talent is uniquely distributed, and we’re focused on developing inclusive teams that can bring the best solutions to everything we do. We strongly believe that celebrating what makes us different makes us better together. Join us—we look forward to getting to know you. We will process your personal data in accordance with our Recruitment Privacy Notice.
Link to Recruitment Privacy Notice: https://www.omc.com/privacy-notice/
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