TL;DR

Principal Fullstack Engineer (AI Systems): Architecting and building AI-powered SaaS platform and automation capabilities for SMEs with an accent on AI-native systems combining LLMs, embeddings, and intelligent automation. Focus on designing scalable AI-driven workflows, improving engineering velocity with AI-assisted tools, and mentoring engineering teams.

Location: Hybrid work with 2–3 days per week onsite in Singapore or Australia; fully remote for other locations

Company

Sleek is a fast-growing startup operating in fintech and SaaS domains, building AI-first operating systems for SMEs with offices in Singapore, Hong Kong, Australia, and the UK.

What you will do

  • Design and implement AI-powered workflows to reduce manual effort in customer and internal operations.
  • Build scalable services combining LLMs, automation pipelines, and software services.
  • Champion AI-assisted development tools to accelerate engineering productivity.
  • Improve platform reliability, observability, and performance of AI-powered systems.
  • Mentor engineers on system design, architecture, and AI-enabled product development.
  • Lead architecture discussions and create reusable frameworks to enhance team velocity.

Requirements

  • 8+ years of fullstack engineering experience delivering complex software systems.
  • Experience building production-grade SaaS platforms in B2B, fintech, or similar environments.
  • Proven experience with AI-powered product capabilities including LLM workflows, document processing, classification, and intelligent automation.
  • Strong proficiency in JavaScript, TypeScript, Node.js, React or Vue, and database systems (Postgres, MySQL, MongoDB).
  • Familiarity with AI development techniques such as prompt engineering, embeddings, RAG, and AI system monitoring.
  • Experience with cloud infrastructure and DevOps practices (AWS preferred).

Nice to have

  • Experience designing AI-first product architectures and internal AI tooling.
  • Experience with agentic workflows, automation platforms, and AI-supporting data pipelines.
  • Background in fintech, accounting, or financial operations platforms.

Culture & Benefits

  • Culture emphasizing humility, kindness, diversity, and inclusion.
  • Flexible work schedule with hybrid onsite requirements in Singapore and Australia; fully remote elsewhere.
  • Competitive salaries, generous paid time off, and flexi benefits for home office and health.
  • Employee share ownership plan and growth opportunities toward becoming a tech-enabled unicorn.
  • Strong focus on personal growth, autonomy, and AI innovation.
  • Certified B Corp committed to building an inclusive and regenerative economy.

Hiring process

  • Screening interview with HR (~30 minutes).
  • Take-home assessment covering backend and frontend (2-3 hours).
  • Case study interview with hiring manager (~90 minutes).
  • Soft skills and behavioral interview with CTO (30-45 minutes).
  • Offer followed by reference calls and background screening as required.