senior web developer

Job Description
Senior Web Developer

In-Person Role in Cheshire, CT -- 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

Back-End & Application Technologies

• Server-Side Language/Runtime: Expertise in a language commonly used for web applications:

• (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,