Principal Full Stack Engineer (AI Systems)

Sleek is seeking a Principal Full Stack Engineer to play a pivotal role in architecting and building AI-powered platform and automation capabilities. The successful candidate will design and deliver AI-native systems that combine traditional software architecture with modern AI capabilities such as LLMs, embeddings, intelligent automation, and agent-driven workflows.

Requirements

• 8+ years of full stack engineering experience delivering complex software systems
• Experience building production-grade SaaS platforms in B2B, fintech, or similar environments
• Proven experience building AI-powered product capabilities, such as LLM-powered workflows, document processing systems, classification or extraction pipelines, and intelligent automation systems
• Strong familiarity with modern AI development techniques, including prompt engineering, embeddings and vector search, retrieval-augmented generation (RAG), and evaluation and monitoring of AI systems
• Advanced proficiency with AI-assisted development tools such as Cursor, including codebase-aware development workflows, AI-assisted debugging and refactoring, AI-generated testing and documentation, and designing prompt workflows that accelerate engineering productivity
• Strong proficiency with JavaScript and TypeScript
• Strong backend experience with Node.js (NestJS a plus)
• Strong frontend experience with React or Vue
• Experience designing scalable APIs and distributed services
• Strong experience with relational databases (Postgres/MySQL) and NoSQL systems (MongoDB)
• Experience with cloud infrastructure and DevOps practices (AWS preferred)
• Strong communication skills and experience collaborating with product and design teams
• A track record of mentoring engineers and improving engineering standards across teams

Benefits

• Humility and kindness
• Flexibility
• Financial benefits
• Personal growth