Senior Full Stack Engineer

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 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 Singapore.

About the Role

Mission :

As the Full Stack Engineer, you will be at the forefront of transforming our technology landscape through comprehensive, end-to-end AI solutions. Your mission is to architect, develop, and deploy scalable systems that leverage advanced Artificial Intelligence and automation capabilities to drive operational efficiency, product innovation, and user satisfaction. You will work closely with cross-functional teams—ranging from data scientists and product managers to UX / UI designers and DevOps professionals—to ensure seamless integration of AI-powered features where they deliver the greatest value, while maintaining a robust software architecture and intuitive user experience. Your role will be instrumental in ensuring our next-generation platform not only meets client and internal needs but also sets new standards for innovation, reliability, and excellence in the AI-driven software industry.

Outcomes :

Deliver High-Quality Code : Consistently submit well-documented, maintainable, and robust code through Pull Requests (PRs) that include comprehensive tests (unit, integration) and adhere to team coding standards and best practices. Aim for high test coverage (e.g., >

80%) on new code.

Apply Strong Fundamentals : Design and implement features demonstrating strong understanding and application of software architecture principles (e.g., SOLID, clean architecture), efficient database design (schema, indexing, query optimization), and API best practices (RESTful design, security).

Leverage AI Tools Effectively : Integrate AI coding assistants and tools into your daily workflow to demonstrably improve development speed (e.g., reducing boilerplate, accelerating test writing, assisting debugging) without compromising code quality, maintainability, or introducing unnecessary complexity. Be prepared to share effective prompts and techniques.

Contribute to System Stability : Keep production rollback rate related to your contributions under 2% by enforcing comprehensive testing, leveraging CI / CD pipelines effectively, and adhering to established DevOps best practices.

Engage in Collaborative Development : Actively participate in code reviews, providing timely, constructive feedback based on engineering principles and best practices. Respond proactively to feedback on your own PRs, contributing positively to team velocity and knowledge sharing.

Requirements

Professional Background : You’ve excelled as a Fullstack Engineer, AI Specialist, or a similar role for 5+ years, developing and deploying scalable applications that harness the power of AI.

Front-End & Back-End : Fluent in React, NodeJS / NestJS, Typescript and SQL, with hands-on experience in microservices that are modular, reusable, and resilient. Experience with VueJS and MongoDB is a bonus.

Databases & Architecture : Comfortable with MongoDB / Supabase, ESR / RPC, and adept at designing solutions aligned with Clean / Hexagonal architecture, SOLID principles, ACID, and idempotency.

AI Frameworks & Tools : Skilled in advanced AI ecosystems—LangChain, LlamaIndex, etc.—with experience in prompt engineering, RAG, and an interest in specialized hardware like Groq.

Quality Advocate : Passionate about maintaining high testing standards, security patches, and thorough documentation for AI pipelines, ensuring consistent and reliable performance.

Interpersonal Skills : Able to communicate fluidly with Agile teams, bridging gaps between product, UX, data science, and engineering to deliver successful AI initiatives.

Cloud & DevOps Expertise : Knowledge of AWS / GCP, when to leverage serverless / PaaS, and experience deploying microservices to Kubernetes—with a keen eye for best practices in MLOps and AI model lifecycle management.

Collaboration & Independence : Equally comfortable working solo or in a team environment, driving projects from ideation to production while inspiring those around you.

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 : This shows reliability and helps build trust within the team. We move fast and need to know that everyone will see things through to completion and proactively help to get things back on track when challenges arise. Accountability is really important to us.

Humility : There is so much we don’t know. Humility allows for open-mindedness to feedback and a willingness to learn from others. It paves the way for collaboration and creates a positive work environment. It is a key ingredient of self awareness and emotional intelligence.

Structured Thinking : Our business is complex with many layers (many services, many countries, many cultures). Regardless of whether you’re more analytical or creative in nature, being able to show sound judgement is important to us. It ensures solutions are pragmatic and balance the needs of the organisation, team and customers.

Attention to detail : You’ll be managing multiple, complex workstreams from numerous stakeholders.  It will be important for you to keep track of everything and notice when information is missing or inconsistent.

Excellent listener and clear communicator : We have a variety of nationalities and for many people, English isn’t their first language.  For you to excel, you’ll need to be present in your calls and make sure you properly receive and thoughtfully send messages to others in the business.

Analytical Mindset : You have a keen eye for detail and a methodical approach to dissecting problems. You excel at analysing complex systems and processes to identify weaknesses and inefficiencies, and your ability to evaluate multiple scenarios enables you to devise the best testing strategies. You apply data-driven decisions to enhance testing coverage and performance metrics, ensuring the highest standards of software quality.

Collaboration-Driven : You thrive in a cross-functional team environment, working closely with developers, product managers, and operations teams to ensure alignment on requirements and testing goals. You communicate effectively, advocate for quality throughout the development process, and proactively address potential issues before they arise, fostering a culture of shared responsibility for delivering exceptional software.

Data driven : We are a data rich business with ~15,000 small customers.  Each decision we make can impact many more people than we realise - so it’s critical that we use sound data to support our strategies and review the success of our initiatives.

Can have tough conversations in a positive way : It’s not a matter of if, but when difficult interpersonal situations arise.  Disagreement, conflict and disappointment are a given in a fast moving business where people care about their work.  People that proactively have tough conversations with kindness build empathy, trust and great working relationships.

Interview Process :

The successful candidate will participate in the below interview stages.

A ~15 minute chat with a member of the HR Team

Take Home Assessment :

A take-home assessment to demonstrate your knowledge and skills in both frontend and backend development.

Estimated time : 2 hours.

Note : Assessment is unrelated to Sleek's business, and will not be used or distributed beyond the interview process.

Case study interview

A ~60 minute chat with the member of the team to validate the technical aptitude of the candidate.

Career Deep Dive / Behavioral fit interview

A ~60 minute chat with the Senior Management to ensure behavioural fit.

Offer + reference calls

We’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 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 : This is a remote position. 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. 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. We have planted over 29,271 trees to reforest our ecosystem and saved 7 tons of paper from landfills by processing over 1.4M pages through SleekSign. We aim to be Carbon Neutral by 2030.