Senior Full-Stack Developer (Ecommerce)

Overview

We are a fast-growing direct-to-consumer ecommerce company known for bold products and a strong digital presence. Our team combines creative brand thinking with a robust technical stack to deliver high-performance online shopping experiences.

We are currently rebuilding our ecommerce platform in partnership with an external agency, transitioning from a headless architecture to a Shopify theme-based environment. During this transition, we need a hands-on Senior Full-Stack Developer who can keep the current site stable, provide technical oversight during the rebuild, and help evolve the platform after migration.

This role is ideal for a developer who thrives in real production environments, enjoys solving complex problems across the stack, and can ship practical improvements quickly without needing perfect specifications.

The Role

This is a senior, hands-on full-stack role responsible for maintaining and improving a revenue-critical ecommerce platform during a major architecture transition.

You will work closely with the Digital Product Manager and cross-functional teams to ensure technical decisions align with business priorities, maintain the integrity of the ecommerce funnel, and ensure a smooth migration to the new platform.

The role spans frontend development, backend services, integrations, analytics integrity, and performance optimization.

Key Responsibilities

1. Maintain and Improve the Current Headless Site

Over the next several months, a core focus will be keeping the existing ecommerce platform stable and performant while the new site is being developed.

Responsibilities include:

Owning day-to-day platform stability by triaging issues, fixing bugs, and shipping improvements
Improving reliability and performance across the ecommerce funnel (Collection → Product Page → Cart → Checkout)
Supporting business-critical updates such as promotions, product launches, and pricing changes
Implementing targeted improvements and refactors that reduce fragility without introducing unnecessary complexity
Maintaining accurate analytics and tracking to protect marketing attribution and experimentation data
Prioritizing pragmatic solutions that keep the business running during the migration period

2. Provide Technical Guidance During the Platform Rebuild

This role will collaborate with an external development agency responsible for rebuilding the ecommerce site.

Responsibilities include:

Providing technical input on feasibility, architecture constraints, integrations, and edge cases
Reviewing key technical deliverables such as implementation approaches and critical pull requests
Participating in working sessions where engineering input is required
Answering technical questions from the agency to ensure accurate implementation
Helping maintain technical standards and launch readiness throughout the rebuild

This role is not responsible for project managing the rebuild, but will act as an engineering partner ensuring quality and technical alignment.

3. Post-Migration Shopify Development & Experimentation

After the platform transition, the focus will shift toward building and iterating on the new Shopify theme-based site.

Responsibilities include:

Developing and improving Shopify theme experiences while maintaining performance and maintainability
Building features and enhancements that support evolving ecommerce needs
Implementing A/B tests and experimentation frameworks to improve conversion and average order value
Managing and extending integrations with third-party tools and services
Creating lightweight documentation and internal technical runbooks

Core Responsibilities

Frontend Development

Build and maintain ecommerce experiences using React and Next.js
Improve user experience across the ecommerce funnel to support conversion and subscription growth
Ensure frontend performance and accessibility standards meet modern web performance expectations

Backend / Platform Development

Develop APIs, serverless functions, and integration services primarily using TypeScript
Troubleshoot issues across multiple services including ecommerce platforms, internal tools, and third-party systems
Improve system observability including logging, monitoring, and error tracking

API Integration & Ecommerce Tooling

Integrate ecommerce systems with subscription, analytics, search, and marketing tools
Ensure reliable data flow and maintainable integration patterns

Performance & Conversion Optimization

Identify and resolve performance bottlenecks across the frontend and backend stack
Implement structured experimentation and testing initiatives
Partner with product leadership to translate business hypotheses into deployable technical solutions

Core Competencies

Problem Solving
Ability to debug complex issues across frontend interfaces, backend services, APIs, integrations, and analytics tracking.

Pragmatic Engineering
Strong judgment in deciding when to refactor, patch, or leave systems unchanged in order to prioritize business impact.

Ownership
Takes responsibility for identifying issues, driving solutions, and documenting important technical decisions.

Results-Focused Development
Understands that platform stability, speed, and conversion performance are just as important as code quality.

Cross-Functional Collaboration
Works effectively with product managers, marketing teams, operations, and external agencies.

Execution in Ambiguity
Comfortable working in imperfect systems and gradually improving them through practical iteration.

Requirements

Must Have

5+ years of professional JavaScript development experience (TypeScript strongly preferred)
3+ years working with React and/or Next.js
Strong experience building and consuming REST APIs (GraphQL is a plus)
Experience working in ecommerce environments (Shopify preferred)
Strong debugging skills across both frontend and backend systems
Excellent written and verbal English communication skills
Ability to work independently and move quickly without fully defined specifications

Nice to Have

Experience developing Shopify themes (Liquid, theme architecture, best practices)
Experience with serverless infrastructure such as AWS Lambda
Familiarity with analytics and tracking implementations (GA4, GTM, Meta Pixel, TikTok Pixel)
Experience collaborating with external development agencies
Familiarity with AI-assisted development tools such as Cursor, Claude Code, or Windsurf

Sr. Full Stack Developer - 57539412665