Case study
Payment Gateway
KangPro is building payment infrastructure on top of the Flip Business API — handling disbursements, payouts, and fund routing for Indonesia's structured trades marketplace.
Backend Developer Available for Contract Projects
We help teams design and build production-ready backend services with clean architecture, strong test coverage, and long-term maintainability. Available as an independent contractor for startups and engineering teams that need experienced backend development support.
We Provide - Backend developer, available on contract.
Hire an experienced backend developer on a flexible contract basis, available for both individual agreements and B2B partnerships, without the overhead of hiring a full-time engineer.
- Independent Contractor. Work directly with an experienced backend developer on a flexible contract basis, without the commitment of a permanent hire.
- B2B or Individual Agreement. Engagement can be arranged either as a business-to-business partnership or as an individual contractor agreement, depending on your company’s procurement requirements.
- Team Integration. We collaborate closely with your internal engineers, product managers, and technical leads, contributing as part of your development team.
- Flexible Collaboration. Suitable for startups and companies that need backend expertise for new development, system improvements, or ongoing maintenance.
Our Expertise - What we do.
We focuses exclusively on backend solutions, transforming your technical specifications into reliable APIs, robust services, and maintainable systems.
- API Development. We design and implement secure, scalable APIs that integrate seamlessly with your existing systems, ensuring robust communication between services.
- Clean Code & Architecture. What sets us apart is our focus on clean code and clean architecture, ensuring that your backend is maintainable, modular, and future-proof.
- Unit Testing & Code Quality. All our deliverables are covered by thorough unit tests, maintaining high code coverage and minimal code smell for long-term stability and reliability.
- Tech Stack & Flexibility. Our core stack is Java with Spring Boot and Ruby with Rails, but we can also work with Python, Node.js, and Golang on request, adapting to your project needs. See GitHub profile.
Clean Systems Consulting delivered a perfectly structured API that integrated seamlessly with our existing platform. Their attention to clean architecture and thorough unit testing gave us confidence in long-term maintainability.
Our Process - How we work.
We focuses exclusively on backend solutions, turning your technical specifications into reliable APIs, robust services, and maintainable systems.
- Documentation-Driven. Every project starts from clear technical documentation. I translate specs into fully functional backend solutions with measurable outcomes. See example.
- Clear Acceptance Criteria. Each deliverable comes with defined acceptance criteria, so you know exactly what to expect and when it’s done. See example.
- Professional Setup. I work from high-end devices: a MacBook Pro M4 Pro 16" and a PC with AMD Ryzen 9 7950 X3D and 128GB RAM, ensuring performance and reliability for every project. See my setup.
- Flexible Engagement. I work asynchronously with minimal meeting overhead, ensuring efficient collaboration across US, EU, and APAC time zones. Every engagement is structured for clarity, quality, and long-term maintainability.
Contact - Let’s Collaborate
If you are looking for backend development support, feel free to reach out. We can discuss your project requirements, engagement model, and how we can collaborate with your team.
- Describe Your Project. Share a short overview of your backend requirements, current system, or technical challenges you are facing.
- Discuss Engagement. We will discuss the scope of work, collaboration model, and whether the engagement will be individual or B2B.
- Define the Plan. Once requirements are clear, we outline the development approach, timeline, and expected deliverables.
- Get in Touch. Contact us via email or LinkedIn to start the conversation and explore how we can support your backend development needs. Contact us.
Engagements are structured based on scope and delivery complexity. Backend development services start from €70 per hour, with flexible arrangements for longer-term collaborations.
Work that speaks for itself
A selection of backend systems we've designed and built — from marketplace infrastructure to payment pipelines. Scoped clearly, delivered cleanly.
Case study
KangPro Backend
KangPro is Indonesia's first structured marketplace for tradespeople — connecting skilled handyman with customers who need home and professional services done right.
Tell us about your project
Our offices
- Copenhagen
1 Carlsberg Gate
1260, København, Denmark - Magelang
12 Jalan Bligo
56485, Magelang, Indonesia