Principal Full Stack Engineer

About the role

Sleek, a Singapore-based fintech and automation company serving micro-SMEs, is hiring a Principal Full Stack Engineer. This is a senior individual contributor role, remote, in the Technology department. You will lead the architectural vision and end-to-end delivery of complex web applications and core platform services, with a high degree of autonomy.

Key responsibilities

• Architect, build and maintain production-grade SaaS applications across the stack with modern JavaScript/TypeScript, frontend frameworks (React/Vue) and backend environments (Node.js/NestJS)
• Design resilient APIs, database schemas (Postgres, MongoDB) and cloud-native services that scale with business growth
• Integrate agentic AI capabilities and intelligent workflows into production applications, with guardrails, evaluation frameworks, fallback strategies and observability
• Build engineering harnesses, automated workflows and internal developer tooling, and introduce AI-assisted development tools to raise productivity
• Improve performance of APIs, data pipelines and microservices, mentor engineers and lead technical architecture reviews

Required profile

• 8+ years shipping and running production SaaS
• Experience with scalable distributed systems, APIs and service boundaries
• Years in TypeScript/Node.js, relational and document databases
• Experience building internal developer tooling and automation
• Experience deploying, monitoring and improving production systems, including observability and security
• Experience building and shipping AI-powered product capabilities in production
• Ability to work autonomously in ambiguous environments and to mentor others

Nice-to-have

• NestJS, React or Vue, Postgres or MySQL, MongoDB, AWS, Kubernetes or Rancher
• Cursor, Grafana, Prometheus, OpenTelemetry
• Async work in globally distributed teams; FinTech, accounting, compliance or RegTech

The interview process lasts no more than 3 weeks and includes a talent acquisition screen, a technical deep dive, a technical panel, an engineering leadership interview and a reference check. Background checks may be required because Sleek is a regulated entity.