Hybrid Principal Full Stack Engineer, AI Systems

at Sleek

• Job title: Principal Full Stack Engineer, AI Systems
• Job type: Full Time
• Experience level: Lead
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: AWS, Cloud, JavaScript, MongoDB, MySQL, Node.js, NoSQL, Postgres, React, TypeScript, Vue.js
• Location requirements: Hybrid, Singapore

About the role

• Principal Full Stack Engineer designing AI-powered workflows for SMEs. Collaborating with teams to evolve Sleek's platform towards an AI-first architecture.

Responsibilities

• Design and implement AI-powered workflows that significantly reduce manual effort in customer and internal operations.
• Build systems that combine LLMs, automation pipelines, and structured software services to solve complex operational problems.
• Deliver production-ready AI capabilities such as:
• document understanding
• intelligent classification
• workflow automation
• AI-assisted decision support
• Identify high-impact opportunities where AI can create step-function improvements in efficiency and customer experience.
• Design scalable services and platform capabilities that support AI-powered features and intelligent automation.
• Introduce patterns for building reliable AI-enabled systems, including:
• evaluation frameworks
• guardrails and fallback strategies
• observability for model behavior
• Establish architectures that support AI orchestration, retrieval systems, and structured automation workflows.
• Champion the use of AI-assisted development tools such as Cursor to accelerate engineering productivity.
• Introduce workflows where AI assists with:
• feature development
• test generation
• refactoring
• documentation
• debugging
• Develop patterns and tooling that allow engineers to ship faster without sacrificing quality or reliability.
• Strengthen observability across services, including monitoring of AI-powered workflows and automation pipelines.
• Identify and eliminate bottlenecks in APIs, data pipelines, and backend services.
• Ensure systems are secure, resilient, and scalable as AI capabilities expand.
• Mentor engineers on system design, architecture, and AI-enabled product development.
• Lead architecture discussions, design reviews, and technical deep dives.
• Create reusable frameworks, components, and patterns that enable the entire engineering team to move faster.

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
• intelligent automation systems
• Strong familiarity with modern AI development techniques, including:
• prompt engineering
• embeddings and vector search
• retrieval-augmented generation (RAG)
• 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
• 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.
• Nice to Have
• Experience designing AI-first product architectures.
• Experience building internal AI tooling for engineering teams.
• Experience with agentic workflows or automation platforms.
• Experience building data pipelines that support AI systems.
• Experience in fintech, accounting, or financial operations platforms.
• Behavioural fit is also important at Sleek, and we will be looking for candidates that have a proven track record of embodying the below attributes in their recent roles:
• Ownership
• Humility
• Structured Thinking
• Data Driven
• Able to have Tough Conversations
• Technical Curiosity
• AI-first mindset

Benefits

• Humility and kindness: Humility is a core attribute we hire for, which means we have a culture of not taking ourselves too seriously and being able to laugh. Kindness is also incredibly important. We are committed to creating and nurturing a diverse and inclusive environment.
• Flexibility: You will be required to work from the office at least 2–3 days per week if you are based in Singapore or Australia. For all other hiring locations, the role will be fully remote, with work from home five days a week. If you need to start early or start late to cater to your family or other needs, we don’t mind, so long as you get your work done and proactively communicate.
• Financial benefits: We pay competitive market salaries and provide staff with generous paid time off and holiday schedules. Additionally, you’ll be able to access our flexi benefits scheme for home office equipment or health and fitness expenditure. Certain staff at Sleek are also eligible for our employee share ownership plan and can share in the upside of our stellar growth trajectory as we work toward listing on a prominent stock exchange in the Asia Pacific region.
• Personal growth: You’ll get a lot of responsibility and autonomy at Sleek - we move at a fast pace so you’ll be making decisions, making mistakes and learning. There’s also a range of internal and external facing training programmes we run. We’re also at the forefront of utilising AI in our space and are developing a regional centre of AI excellence. It is our intention that if you leave Sleek, you leave as a more well-rounded person and professional.
• Sleek is also a proudly certified B Corp. Since we started our journey in 2017, we’ve been committed to building Sleek as a force for good. In just over 5 years, we’ve joined a community of industry leaders like Patagonia, Ben & Jerry's, and P&G who are building an inclusive, equitable, and a regenerative economy.