Principal Full Stack Engineer

Sleek, Millers Point, New South Wales, Australia Join or sign in to find your next job Join to apply for the Principal Full Stack Engineer role at Sleek 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 growing their business and serving customers. With a growing number of entrepreneurs globally, we are innovating in a lucrative space. We operate three business segments: Corporate Secretary: Automating company incorporation, secretarial, filing, nominee director, mailroom and immigration processes via custom online robots and SleekSign. We are 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 businesses. Sleek launched in 2017 and now has around 15,000 customers across our offices in Singapore, Hong Kong, Australia and the UK. We have a staff of 500 with an intact startup mindset. We recently raised Series B financing off the back of >70% compound annual growth in revenue over the last five 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 Singapore. Mission To streamline operations and elevate customer experience through intelligent automation and modern engineering. About the Role We are seeking a Principal Full Stack Engineer who will be a key individual contributor responsible for architecting, building, and scaling Sleek’s next generation of AI‑powered capabilities. As one of Sleek’s most senior individual contributors, you will partner closely with Product, Design, and Engineering Leads to define technical direction, architect robust AI‑first solutions, and deliver reliable, maintainable software. You will also help integrate AI thoughtfully and pragmatically into Sleek products and internal processes. You Will Ensure High‑quality, scalable, secure engineering solutions. Thoughtful and practical application of AI to automate and improve customer workflows. High‑quality systems capable of supporting advanced AI workloads at scale. Strong engineering standards, testing, and maintainability. Clear communication, alignment, and predictable delivery across teams. Mentorship and technical leadership to elevate the broader engineering team. Deliver High‑Impact Product and Platform Improvements Lead end‑to‑end design and implementation of major product features and platform enhancements. Deliver solutions that improve performance, reduce operational issues, and enhance scalability. Take ownership of a complex technical domain and become the subject‑matter expert for it. Strengthen Architecture and Technical Foundations Assess current architecture and propose a 6–12 month roadmap of improvements (performance, reliability, modularity). Introduce or refine engineering patterns and frameworks to speed up development while ensuring stability and quality. Drive adoption of best practices in API design, modular architecture, and system observability. Improve Quality, Standards, and Engineering Best Practices Establish or refine engineering standards (testing, linting, CI/CD, error handling, code review quality). Champion the use of modern engineering tools, including AI‑assisted development and testing tools, to improve team productivity. Ensure strong automated test coverage and modern DevOps practices across services. Identify recurring technical debt and support requests, and lead systemic fixes rather than one‑off patches. Advance Performance, Security, and Operational Reliability Introduce meaningful monitoring, logging, alerting, and resilience patterns for critical services. Detect and fix bottlenecks in API performance, data modeling, database queries, or front‑end rendering. Strengthen “secure‑by‑default” coding practices and guide teams on potential risks. Mentor and Elevate the Engineering Team Provide hands‑on coaching to mid and senior engineers; uplift the skillset of the entire engineering org. Lead architecture reviews, design discussions, and tech deep dives with clarity and influence. Act as a force multiplier through clear documentation, reusable components, patterns, and frameworks. Strengthen Cross‑Functional Collaboration Work closely with PM, QA, and Design to refine requirements and ensure stories meet DOR/DOD. Communicate proactively about risks, trade‑offs, estimates, and delivery expectations. Serve as a trusted partner to business and product stakeholders for complex or ambiguous technical problems. Requirements 8+ years of full‑stack engineering experience. 8+ years leading delivery of complex systems. Experience designing scalable architectures, APIs, and services with strong testing and observability. Strong proficiency with JavaScript and TypeScript. Strong proficiency in modern backend technologies (Node.js, bonus if experience with NestJS) and frontend frameworks (React or Vue). Strong proficiency with both relational databases (Postgres or MySQL) and No‑SQL databases (MongoDB), along with ORMs like TypeORM and Mongoose. Proven track record delivering production‑grade applications in SaaS, B2B, FinTech, or similar environments. Hands‑on experience building and integrating AI‑powered features (LLM‑based automation, classification, document processing, or workflow enhancement). Familiarity with AI development and evaluation tools (vector search, embeddings, prompt frameworks, or AI‑assisted development tools). Solid understanding of cloud platforms (AWS preferred), CI/CD pipelines, and DevOps practices. Excellent communication skills and experience partnering with Product, Design, and QA. A history of mentoring engineers and raising engineering quality across teams. Nice to have: Experience in FinTech (accounting, bookkeeping, etc). Role – Behavioral Fit Ownership Reliability and accountability help build trust. We move fast and need everyone to see things through to completion and proactively get things back on track when challenges arise. Humility An open‑mind to feedback and a willingness to learn from others. It paves the way for collaboration and a positive work environment. Structured Thinking Decisions must be sound and pragmatic, balancing the needs of the organisation, team, and customers. Attention to Detail Managing multiple complex workstreams and noticing missing or inconsistent information is critical. Excellent Listener and Clear Communicator Effective communication is key, especially in a diverse, multilingual environment. Analytical Mindset Data‑driven decisions to enhance testing coverage and performance metrics, ensuring the highest standards of software quality. Collaboration‑Driven Thriving in a cross‑functional team, advocating for quality, and proactively addressing potential issues. Data‑Driven Use sound data to support strategies and review the success of initiatives. Can Have Tough Conversations in a Positive Way Building empathy and trust through kind, constructive dialogues on difficult situations. Interview Process A ~30 minute chat with a member of the HR Team. A 2–3 hour take‑home assessment covering backend and frontend challenges. A ~90 minute chat with the Hiring Manager and/or another member of the team to validate technical aptitude. A ~30–45 minute chat with the CTO to validate behavioral fit. Offer and reference calls. We’ll make a non‑binding offer verbally or over email followed by short phone or video reference calls. Background Screening We perform background checks depending on the role, which may include verification of education, criminal history, political exposure, bankruptcy or adverse credit history. Consent is required before conducting these checks. Benefits Humility and Kindness We are committed to a diverse and inclusive environment and encourage humility and kindness among all employees. Flexibility Work from home 2–3 days per week, with flexible start or finish times as long as deliverables are met and communication is proactive. Financial Benefits Competitive salaries, generous paid time off, holiday schedules, flexi benefits for home office equipment or health, and eligibility for an employee share ownership plan. Personal Growth Responsibility, autonomy, frequent learning opportunities, internal and external training programmes, and the chance to contribute to a regional AI excellence centre. Sleek is also a proudly certified B Corp. Since our journey began in 2017, we have committed to building a force for good, planting over 29,271 trees, saving 7 tons of paper, and aiming for carbon neutrality by 2030. By submitting a job application, you confirm that you have read and agree to our Data Privacy Statement for Candidates, found at sleek.com. #J-18808-Ljbffr