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 three 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 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 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 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.

About The Role

Mission: At Sleek, we are on a mission to streamline operations and elevate customer experience through intelligent automation and contemporary engineering. 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.

Outcomes:

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 modelling, 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 to 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 to have 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, such as LLM‑based automation, classification, document processing, or workflow enhancement.
- Familiarity with AI development and evaluation tools (e.g.,



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.).

Behavioural fit is also important at Sleek, and we will be looking for candidates that have a proven track record of embodying the following attributes in their recent roles:

- Ownership: Reliability and proactive problem resolution.
- Humility: Openness to feedback and willingness to learn.
- Structured Thinking: Pragmatic solutions balancing organisational, team, and customer needs.
- Attention to Detail: Managing complex workstreams and spotting inconsistencies.
- Excellent Listening and Clear Communicating: Effective across diverse nationalities and languages.
- Analytical Mindset: Data‑driven problem solving and testing strategy design.
- Collaboration‑Driven: Cross‑functional teamwork and proactive issue resolution.
- Data‑Driven: Sound data usage to guide decisions and evaluate success.
- Tough Conversations with Kindness: Constructive conflict resolution.

Interview Process

- 30‑minute chat with an HR team member.
- Take‑home assessment (2–3 hours) covering backend and frontend engineering and AI integration.
- 90‑minute technical interview with the hiring manager or another team member to validate technical aptitude.
- 30‑45 minute behavioral interview with the CTO to validate desired experience.
- Offer and reference calls.

We require background screening consistent with Sleek’s regulatory obligations, including verification of education, criminal history, political exposure, and bankruptcy or adverse credit history. Consent will be requested prior to any checks.

By submitting a job application, you confirm that you have read and agree to our Data Privacy Statement for Candidates, found at sleek.com.

Benefits

- Humility and Kindness: Core cultural attributes and a supportive inclusive environment.
- Flexibility: Work from home 2–3 days per week and adjust start times to accommodate personal needs.
- Financial Benefits: Competitive market salaries, generous paid time off, holiday schedules, flexi advantages for home office equipment, health and fitness expenditures, and eligibility for an employee share ownership plan.
- Personal Growth: Responsibility, autonomy, learning opportunities, and internal/external training programmes. Regional AI excellence centre development.
- We are a proudly certified B Corp, committed to building an inclusive, equitable, and regenerative economy. We aim to be carbon neutral by 2030 and have planted over 29,271 trees.

Sleek is also a proud B Corp and aims to continue building an inclusive, equitable, and regenerative economy. By planting trees, reducing paper waste, and driving responsible growth, we help create a carbon‑neutral future.

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📌 Principal Full Stack Engineer (City of Sydney)
🏢 Sleek
📍 City of Sydney