Senior Fullstack Engineer - TypeScript / Next.js / Supabase

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Fullstack Engineer - TypeScript / Next.js / Supabase in United Kingdom.

This role offers the opportunity to work across multiple fast-scaling SaaS products in a highly technical, product-driven environment spanning AI, healthcare, and data intelligence. You will contribute to the development of modern full-stack applications, with a strong focus on building scalable, reliable, and well-architected systems. The position involves working on an AI-powered sales intelligence platform as the primary product, while also supporting healthcare and audience intelligence applications. You will be responsible for delivering high-quality features, integrating complex APIs, and maintaining robust backend systems. The environment is async-first, documentation-driven, and emphasizes clean execution and engineering discipline. This is a high-impact role where your work directly contributes to building scalable, multi-tenant SaaS platforms used in real-world enterprise contexts.

• Develop and implement full-stack features across multiple SaaS platforms, with a primary focus on an AI-driven sales intelligence product.
• Build modern UI components, dashboards, and workflows using React and Next.js.
• Design and maintain API routes with proper validation, pagination, error handling, and performance optimization.
• Implement webhook pipelines, asynchronous workflows, and background job processing systems.
• Contribute to database design, schema evolution, migrations, and row-level security policies using PostgreSQL and Supabase.
• Debug and maintain third-party API integrations, ensuring stability and reliability across systems.
• Develop onboarding flows, authentication systems, and role-based interfaces for healthcare-related applications.
• Write unit and integration tests to ensure system reliability and maintainability.
• Collaborate through Git-based workflows, code reviews, and structured documentation practices.

Requirements:

• 2–4+ years of experience working with TypeScript in strict mode, including generics and advanced typing.
• Strong experience with Next.js (App Router, API routes, middleware).
• Solid proficiency in React with modern component architecture practices.
• Strong understanding of PostgreSQL, including schema design, joins, queries, and row-level security.
• Experience with Supabase or similar backend-as-a-service platforms (auth, database, storage, edge functions).
• Hands-on experience with REST API integrations, debugging, and handling third-party API inconsistencies.
• Experience working with webhooks, background jobs, and asynchronous data processing systems.
• Familiarity with Git workflows including pull requests, code reviews, and branching strategies.
• Strong problem-solving skills with the ability to debug complex system-level issues independently.
• Clear communication skills and ability to work in an async, documentation-driven environment.
• Nice to have: experience with multi-tenant SaaS, AI systems, healthcare/regulated environments, or system design patterns.

Benefits:

• Competitive compensation based on experience and location.
• Fully remote role with flexible working arrangements.
• Opportunity to work on advanced AI-driven and multi-product SaaS platforms.
• Long-term growth potential with increasing ownership and leadership opportunities.
• Exposure to complex systems, scalable architectures, and high-impact engineering challenges.
• Collaborative, async-first engineering culture focused on quality and reliability.
• Direct impact on product development across AI, healthcare, and data intelligence domains.