Senior Backend Enngineer

The company is revolutionizing e-commerce advertising by connecting post-purchase shoppers with relevant cross-sell opportunities. Our platform powers promotional ad experiences that appear immediately after checkout, helping shoppers discover complementary products while helping merchants drive incremental revenue.We’re a seed-stage company tackling complex, 0→1 ad-tech challenges — from real-time bidding and analytics infrastructure to high-performance frontend experiences that run across millions of checkouts every day.Ad server and bidding logic for real-time placement optimization.High-performance APIs handling millions of requests.Analytics systems for revenue tracking and reporting.Integrations with major e-commerce platforms and ad networks.Requirements:Tech stack:Node.js, KeystoneJS 6, PostgreSQL 16, Redis, Prisma ORM, AWS ECS, Terraform, Docker, Sentry, TypeScript.You’ll excel if you have:5+ years in backend or full-stack development.Deep experience with Node.js, TypeScript, PostgreSQL, and Redis.Experience designing scalable APIs and optimizing queries.Familiarity with distributed systems, caching, and AWS infrastructure.Mindset: Systems thinker who balances speed and scalability — you see the full architecture, not just endpoints.