Principal Full Stack Engineer (AI Systems)

Through proprietary software and AI, along with a focus on customer delight, Sleek makes the back-office easy for micro SMEs.We give Entrepreneurs time back to focus on what they love doing - growing their business and being with customers. With a surging number of Entrepreneurs globally, we are innovating in a highly lucrative space.We operate 3 business segments: Corporate Secretary: Automating the company incorporation, secretarial, filing, Nominee Director, mailroom and immigration processes via custom online robots and SleekSign. We are the market leaders in Singapore with :5% market share of all new business incorporations Accounting & Bookkeeping: Redefining what it means to do Accounting, Bookkeeping, Tax and Payroll thanks to our proprietary SleekBooks ledger, AI tools and exceptional customer service FinTech payments: Overcoming a key challenge for Entrepreneurs by offering digital banking services to new businessesSleek launched in 2017 and now has around 15,000 customers across our offices in Singapore, Hong Kong, Australia and the UK. We have around 500 staff with an intact startup mindset.We have recently raised Series B financing off the back of >70% compound annual growth in Revenue over the last 5 years. Sleek has been recognised by The Financial Times, The Straits Times, Forbes and LinkedIn as one of the fastest growing companies in Asia.Backed by world-class investors, we are on track to be one of the few cash flow positive, tech-enabled unicorns based out of Asia Pacific.Mission:At Sleek, we are building the AI-first operating system for SMEs.Our mission is to eliminate manual work across accounting, compliance, and financial operations by embedding intelligence directly into the systems that power our platform. We believe the next generation of SaaS will be AI-native, where software orchestrates intelligent workflows rather than simply recording transactions.We are seeking a Principal Full Stack Engineer who will play a pivotal role in architecting and building Sleek's AI-powered platform and automation capabilities.As one of Sleek's most senior individual contributors, you 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.You will also act as a force multiplier for the engineering organization, championing AI-assisted development practices and helping the entire team build faster and smarter.This role is ideal for an engineer who enjoys:Designing systems, not just featuresBuilding AI-powered workflows that eliminate operational workUsing AI to accelerate engineering productivityCreating platform capabilities that unlock product velocityYou will partner closely with Product, Design, and Engineering leaders to ensure Sleek's platform evolves toward an AI-first architecture.Outcomes:Build AI-Native Product CapabilitiesDesign and implement AI-powered workflows that significantly reduce manual effort in customer and internal operationsBuild systems that combine LLMs, automation pipelines, and structured software services to solve complex operational problemsDeliver production-ready AI capabilities such as:document understandingintelligent classificationworkflow automationAI-assisted decision supportIdentify high-impact opportunities where AI can create step-function improvements in efficiency and customer experienceArchitect the Foundation for AI-Driven SystemsDesign scalable services and platform capabilities that support AI-powered features and intelligent automationIntroduce patterns for building reliable AI-enabled systems, including:evaluation frameworksguardrails and fallback strategiesobservability for model behaviorEstablish architectures that support AI orchestration, retrieval systems, and structured automation workflowsMultiply Engineering Velocity with AIChampion the use of AI-assisted development tools such as Cursor to accelerate engineering productivityIntroduce workflows where AI assists with:feature developmenttest generationrefactoringdocumentationdebuggingDevelop patterns and tooling that allow engineers to ship faster without sacrificing quality or reliabilityImprove Platform Reliability and PerformanceStrengthen observability across services, including monitoring of AI-powered workflows and automation pipelinesIdentify and eliminate bottlenecks in APIs, data pipelines, and backend servicesEnsure systems are secure, resilient, and scalable as AI capabilities expandElevate the Engineering OrganizationMentor engineers on system design, architecture, and AI-enabled product developmentLead architecture discussions, design reviews, and technical deep divesCreate reusable frameworks, components, and patterns that enable the entire engineering team to move fasterRequirements8+ years of full stack engineering experience delivering complex software systemsExperience building production-grade SaaS platforms in B2B, fintech, or similar environmentsProven experience building AI-powered product capabilities, such as:LLM-powered workflowsdocument processing systemsclassification or extraction pipelinesintelligent automation systemsStrong familiarity with modern AI development techniques, including:prompt engineeringembeddings and vector searchretrieval-augmented generation (RAG)evaluation and monitoring of AI systemsAdvanced proficiency with AI-assisted development tools such as Cursor, including:codebase-aware development workflowsAI-assisted debugging and refactoringAI-generated testing and documentationdesigning prompt workflows that accelerate engineering productivityStrong proficiency with JavaScript and TypeScriptStrong backend experience with Node.js (NestJS a plus)Strong frontend experience with React or VueExperience designing scalable APIs and distributed servicesStrong 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 teamsA track record of mentoring engineers and improving engineering standards across teamsNice to HaveExperience designing AI-first product architecturesExperience building internal AI tooling for engineering teamsExperience with agentic workflows or automation platformsExperience building data pipelines that support AI systemsExperience in fintech, accounting, or financial operations platformsBehavioural 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:OwnershipHumilityStructured ThinkingData DrivenAble to have Tough ConversationsTechnical CuriosityAI-first mindsetInterview Process:The successful candidate will participate in the below interview stages.Screening Interview:A :30 minute chat with a member of the HR Team.Take Home Assessment:A 2-3 hour take-home assessment that covers both backend and frontend, challenging the candidate's ability to build projects from scratch and adhere to good coding standards.Case Study Interview:A :90 minute chat with the Hiring Manager and/or another member of the team to validate the technical aptitude of the candidate.Soft Skills / Behavioral fit interview:A :30-45 minute chat with the CTO to validate our desired experience.Offer + reference callsWe'll make a non-binding offer verbally or over email, followed by a couple of short phone or video calls with references that you provide to us.Requirement for background screeningPlease be aware that Sleek is a regulated entity and as such is required to perform different levels of background checks on staff depending on their role.This may include using external vendors to verify the below:Your educationAny criminal historyAny political exposureAny bankruptcy or adverse credit historyWe will ask for your consent before conducting these checks. Depending on your role at Sleek, an adverse result on one of these checks may prohibit you from passing probation.By submitting a job application, you confirm that you have read and agree to our Data Privacy Statement for Candidates, found at sleek.com.BenefitsHumility 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.