Job Details

Timspark is seeking a Senior Full-Stack Engineer with expertise in React, TypeScript, and Supabase for a remote EU-based role. The position involves building and managing applications, integrating payment and AI systems, and ensuring robust security.

Timspark is looking for a Senior Full-Stack Engineer to join our international team. Senior Full-Stack Engineer with strong experience in React and TypeScript (SPA architecture) Solid backend experience with serverless environments, preferably Supabase Edge Functions or Deno runtime Strong knowledge of PostgreSQL including schema design, performance tuning, and Row-Level Security (RLS) Experience deploying and managing applications on Vercel or similar platforms with global CDN and auto-scaling Good understanding of network security principles including WAF, DDoS protection, and SSL/TLS (Cloudflare experience is a plus) Hands-on experience integrating payment systems, preferably Stripe Experience with open banking integrations such as Plaid or other PSD2-compliant providers Familiarity with AI/LLM integrations, ideally working with Anthropic Claude or similar models Experience with LLM observability tools (e.g., Langfuse) including cost tracking and performance monitoring Strong API design skills (REST/gRPC) and ability to structure scalable, maintainable services Experience with authentication and authorization patterns, including secure session handling and token-based auth Understanding of frontend-backend interaction patterns, state management, and performance optimization in SPAs Ability to work with third-party APIs and manage integrations reliably Experience with CI/CD pipelines and modern development workflows Strong debugging, testing, and code review practices Ability to work independently in a fast-paced environment and make pragmatic engineering decisions Good communication skills and ability to collaborate with cross-functional teams including product and design Fluent English (written and spoken)

Strong experience in React and TypeScript (SPA architecture) Solid backend experience with serverless environments, preferably Supabase Edge Functions or Deno runtime Strong knowledge of PostgreSQL including schema design, performance tuning, and Row-Level Security (RLS) Experience deploying and managing applications on Vercel or similar platforms with global CDN and auto-scaling Good understanding of network security principles including WAF, DDoS protection, and SSL/TLS (Cloudflare experience is a plus) Hands-on experience integrating payment systems, preferably Stripe Experience with open banking integrations such as Plaid or other PSD2-compliant providers Familiarity with AI/LLM integrations, ideally working with Anthropic Claude or similar models Experience with LLM observability tools (e.g., Langfuse) including cost tracking and performance monitoring Strong API design skills (REST/gRPC) and ability to structure scalable, maintainable services Experience with authentication and authorization patterns, including secure session handling and token-based auth Understanding of frontend-backend interaction patterns, state management, and performance optimization in SPAs Ability to work with third-party APIs and manage integrations reliably Experience with CI/CD pipelines and modern development workflows Strong debugging, testing, and code review practices Ability to work independently in a fast-paced environment and make pragmatic engineering decisions Good communication skills and ability to collaborate with cross-functional teams including product and design Fluent English (written and spoken)

Location - EU