Senior Web Developer

Job Description

Senior Web Developer

(Cheshire-based, not remote) Rebellion Group is seeking a highly skilled and motivated Senior Web Developer to play a critical role in the development and maintenance of our high-traffic, scalable web applications. A Senior Web Developer at Rebellion Group needs not just familiarity, but deep, expert-level knowledge across the full technology stack, coupled with a strong understanding of architecture, performance, and team collaboration tools. You must demonstrate a proven ability to work independently, take ownership, and manage project timelines effectively, you should be comfortable with the unknown. You will be a key technical leader, responsible for setting coding standards, mentoring team members, and tackling the most complex technical challenges.

Agency experience is a plus; this is a semi-hybrid work schedule, requiring at least 4 days per week in the Cheshire office, one of those days being Wednesday.

Key Responsibilities

Technical Leadership & Architecture:

• Design, architect, and develop highly performant, scalable, and secure web applications.
• Lead the technical planning and execution of large, complex features and projects.
• Define and enforce coding standards, development best practices, and secure coding principles across the team.
• Conduct thorough code reviews, providing constructive feedback to ensure high code quality and maintainability.
• Drive the evaluation and adoption of new technologies, frameworks, and tools to improve the development process and product performance.

Development & Implementation:

• Write clean, efficient, well-documented, and testable code for both front-end and back-end components.
• Troubleshoot, debug, and resolve complex production issues and performance bottlenecks in our systems.
• Ensure application stability, speed, and security through continuous testing and optimization.
• Collaborate with Project Managers and UX/UI Designers to translate user stories and wireframes into technical specifications and functional, intuitive user interfaces.

Qualifications & Skills 

Core Web Technologies:

• HTML5 & CSS3: Mastery of semantic markup, accessibility (WCAG), modern CSS in frameworks like Bootstrap, Tailwind, etc.
• JavaScript: Deep understanding of asynchronous programming, closures, promises/async/await, and TypeScript for large-scale application development.
• Front-End Framework/Library: Expertise in at least one major framework, including its ecosystem and core architectural patterns:
  • React
  • Vue.js

Back-End & Application Technologies:

• Server-Side Language/Runtime: Expertise in a language commonly used for web applications:
  • Node.js (Express)
  • Python
  • PHP (WordPress, Laravel methodologies)
• Database Systems: Strong command of both relational and non-relational databases:
  • SQL Databases (e.g., PostgreSQL, MySQL): Advanced querying, optimization, and database design (schemas, indexing, normalization).
  • NoSQL Databases (e.g., MongoDB, Redis): Understanding when to use them, data modeling, and performance tuning.
• API Development: Mastery of designing and building efficient, secure APIs:
  • RESTful APIs: Design principles, best practices, and versioning.
  • GraphQL: Deep knowledge of query language, schema design, and resolvers.

Architecture & Infrastructure:

• Version Control: Complete mastery of Git and platforms like GitHub/GitLab/Bitbucket.
• Cloud Platforms: Familiarity with major cloud service providers (e.g., AWS, Azure, GCP) and core services like compute, storage, and networking.
• Hosting Infrastructure support - WPEngine, DigitalOcean, Netlify - familiar with many hosting methodologies, shared, virtual, baremetal, etc, & website host migrations
• Understanding of SSH & SFTP/FTP functions and setting up accounts and servers in a variety of shared and virtual private hosting environments
• Understanding of domain and hosting functions to create, transfer and troubleshoot client assets between hosting environments and providers
• Knowledge of setting up/importing/exporting databases for CMS setups and transfers
  • Via plugins/GUI tools at a minimum, via CLI tools a major plus
• DevOps & Deployment: Understanding of continuous integration/continuous deployment (CI/CD), and containerization technologies like Docker and Kubernetes.
• Architectural Patterns: Ability to implement and reason about patterns like Microservices, Serverless (e.g., AWS Lambda), Monoliths, and Headless CMS (e.g., Contentful).
• Full-Stack Frameworks: Knowledge of meta-frameworks that combine front-end and back-end logic, such as Next.js or Nuxt.
• CMS - WordPress, Concrete CMS, Shopify and familiarity with various other CMS solutions such as Decap, Craft, BigCommerce
• Experience with static site generators such as Eleventy or Jekyll
• Experience supporting QA test automation
• Developing accessible (WCAG 2.0 - 2.2 standards, A & AA level compliance) websites

Performance & Security:

• Web Performance Optimization (WPO): Techniques for optimizing site speed, including bundle size analysis, code splitting, caching strategies, and meeting Core Web Vitals.
• Security Best Practices: Knowledge of common vulnerabilities and mitigation techniques (OWASP Top 10), including cross-site scripting (XSS), SQL injection, secure authentication/authorization (OAuth, JWT), and secure header configuration (CSP).

Preferred Soft Skills:

• Exceptional written and verbal communication skills, with the ability to explain complex technical concepts to non-technical stakeholders.
  • Consultation Meetings - Client and Internal
  • Support the creation of detailed technical and user documentation
• Strong analytical and problem-solving abilities, with a proven track record of resolving critical issues.
• Proven leadership and project coordination experience.
  • Work with other Rebels and clients to identify business requirements and draft project definitions, technical specifications and the appropriate architecture
  • Perform to high quality standards while understanding the importance of meeting client delivery deadlines and budgets
  • Best Practices & Shortcuts when necessary and Team Professional Development
  • Code Review and PRs
• A passion for continuous learning and staying current with emerging web technologies and industry trends including coding with AI

Equal Opportunity Employer

At Rebellion Group, we celebrate difference. We don’t just accept it — we want it. We’re proud to be an equal opportunity employer, and we’re committed to creating an inclusive environment for all Rebels.