Senior FS Engineer 50/50
An advanced checkout marketing platform that transforms the post-purchase moment into a high-impact engagement opportunity. Using AI and real-time decisioning, it delivers personalized offers during checkout, helping businesses boost revenue while enhancing the customer experience. Built by experienced ad-tech professionals, it combines ad-serving infrastructure, scalable analytics, and seamless integrations to power high-performance e-commerce growth. We are currently looking for a Senior Full Stack Engineer to join our team and help build and scale this next-generation platform. Our Tech Stack : Backend: KeystoneJS 6, Node.js, PostgreSQL 16, Redis, Prisma ORM Frontend: Next.js 15, React 19, TypeScript, Tailwind CSS, Radix UI Infrastructure: AWS ECS, Terraform, Docker, Application Load Balancer Tooling: Yarn Workspaces, Jest, Playwright, Task Runner, Sentry AI-Forward: We use AI extensively across development, automation (n8n), product management, and marketing What You'll Do: Architect and implement core ad-serving infrastructure Design high-performance APIs that handle real-time bidding Create sophisticated analytics systems for revenue tracking Manage database migrations and performance optimization Implement third-party integrations with major partners Build developer tools and automation workflows Create comprehensive analytics dashboards Optimize queries and caching strategies Implement A/B testing frameworks Work directly with founders and product team Shape technical architecture and engineering culture Mentor junior developers and contractors
Requirements
Who We're Looking For: Core Requirements 5+ years of full-stack development experience Expert-level TypeScript/JavaScript and modern frameworks Production experience with PostgreSQL, APIs, and cloud infrastructure Ownership mindset - you see problems and solve them without being asked Startup DNA Sense of urgency - you understand that speed and quality aren't mutually exclusive Adaptability - you thrive when priorities shift and requirements evolve AI enthusiast - you see AI-driven development as essential, not optional Disagree and commit - you voice opinions then align with team decisions Multitasker - you can context-switch between infrastructure, frontend, and business logic Technical Edge Bleeding-edge curious - you experiment with new technologies and share learnings Data-driven - you make decisions based on metrics, not assumptions Systems thinker - you understand how pieces fit together at scale Bonus Points Ad-tech experience - you understand RTB, DSPs, attribution, or affiliate marketing Data engineering - you've built ETL pipelines, analytics systems, or data warehouses Our exact stack - KeystoneJS, Next.js, PostgreSQL, AWS infrastructure Apply To This Job