Sr. Full Stack Developer - 57539412665

Senior Full-Stack Developer (Ecommerce)OverviewWe 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 RoleThis 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 Maintain and Improve the Current Headless SiteOver 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 Provide Technical Guidance During the Platform RebuildThis 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. Post-Migration Shopify Development & ExperimentationAfter 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 ResponsibilitiesFrontend DevelopmentBuild 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 DevelopmentDevelop 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 ToolingIntegrate ecommerce systems with subscription, analytics, search, and marketing tools Ensure reliable data flow and maintainable integration patterns Performance & Conversion OptimizationIdentify 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 CompetenciesProblem SolvingAbility to debug complex issues across frontend interfaces, backend services, APIs, integrations, and analytics tracking.Pragmatic EngineeringStrong judgment in deciding when to refactor, patch, or leave systems unchanged in order to prioritize business impact.OwnershipTakes responsibility for identifying issues, driving solutions, and documenting important technical decisions.Results-Focused DevelopmentUnderstands that platform stability, speed, and conversion performance are just as important as code quality.Cross-Functional CollaborationWorks effectively with product managers, marketing teams, operations, and external agencies.Execution in AmbiguityComfortable working in imperfect systems and gradually improving them through practical iteration.RequirementsMust Have5+ 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 HaveExperience 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