Principal Full Stack Engineer
Sleek · Full-time · Posted 4w ago
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 businesses
Sleek launched in 2017 and now has around 17,500 customers across our offices in Singapore, Hong Kong, Australia and the UK. We have around 600 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.
At Sleek, we are on a mission to streamline operations and elevate customer experience through intelligent automation and modern engineering.
About the Role:
As a Principal Full Stack Engineer, you will be one of Sleek’s most senior individual contributors, leading the architectural vision and end-to-end delivery of complex web applications and core platform services. You'll operate with a high degree of autonomy, solving ambiguous engineering problems while helping raise the technical standards of the wider engineering organisation.
Mission:
In this role you will balance deep technical execution across the full stack—from intuitive user interfaces to scalable distributed backend systems—while championing developer productivity and embedding agentic AI workflows into our products.
Key Outcomes:
1. Full Stack Architecture & Product Delivery
Architect, build, and maintain production-grade SaaS applications across the entire stack using modern JavaScript/TypeScript, frontend frameworks (React/Vue), and backend environments (Node.js/NestJS).
Design resilient APIs, database schemas (Postgres, MongoDB), and cloud-native services capable of scaling with business growth.
Partner closely with Product, Design, and Engineering leaders to turn complex operational and financial challenges into simple, robust software solutions.
2. Agentic AI Integration
Architect and implement agentic AI capabilities and intelligent workflows into production applications (e.g., document processing, automated classification, and decision-support systems).
Establish reliability patterns for AI features, including guardrails, evaluation frameworks, fallback strategies, and observability for model behavior.
3. Harness Engineering & Engineering Productivity
Build and maintain engineering harnesses, automated workflows, and internal developer tooling that eliminate friction in the engineering lifecycle.
Introduce modern AI-assisted development tools (such as Cursor, automated test/documentation generators, and debugging aids) to significantly increase productivity across the entire engineering organization.
4. Platform Performance & Technical Leadership
Identify and eliminate performance bottlenecks in APIs, data pipelines, and backend microservices.
Mentor senior and mid-level engineers, lead technical architecture reviews, and raise the bar for code quality, testing, and system design across Sleek.
Requirements
Must-Have Requirements:
What Success Looks Like
Nice-to-Have Experience
The interview process
The successful candidate will participate in the below interview stages. We anticipate the process to last no more than 3 weeks from start to finish.
Whether the interviews are held over video call or in person will depend on your location and the role.
Talent Acquisition Screen (30 minutes)
An introductory conversation with a member of our Talent Acquisition team to learn more about your background, motivations, and overall fit for the role.
Technical Deep Dive (60 minutes)
A discussion with a member of the Engineering team focused on your recent experience, technical ownership, architecture decisions, AI experience, and engineering approach.
Technical Panel Interview (90 minutes)
A live technical interview with a panel of two engineers covering system design, distributed systems, software architecture, AI engineering, production systems, reliability, engineering trade-offs, and developer productivity.
Engineering Leadership Interview (45–60 minutes)
A behavioural discussion with Engineering Leadership exploring ownership, communication, technical leadership, decision-making, mentoring, and how you work in ambiguous environments
Reference Verification
Prior to final offer confirmation, we will conduct one professional reference check with your recent direct manager or supervisor. To keep the process moving smoothly, this step may be initiated during the final interview stages
Requirement for background screening
Please 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 education
Any criminal history
Any political exposure
Any bankruptcy or adverse credit history
We 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.
Benefits
Some other great things about working at Sleek…
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’ll be able to work remotely. 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. You can also work fully remote from anywhere in the world for 1 month each year
Financial benefits: We pay competitive market salaries and provide staff with generous paid time off and holiday schedules. 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.
New Zealand