Custom web applications
End-to-end delivery of web applications — from requirements and architecture to a production-ready backend and a clean, usable frontend.
Custom software & engineering talent
Custom software solutions shaped around your business, your needs, and the people who use them.
We start by understanding how your business works and who will use the software every day — then design, build and evolve systems that fit. And when your own team needs extra capacity, our engineers join it directly.
- 10+
- years building enterprise software
- 5
- industries served
- 100%
- senior engineers, no juniors on your bill
Services
What we do
From a single integration to a complete platform — we cover the full lifecycle of business software.
System integration & APIs
Connecting core systems, third-party providers and internal tools through well-designed REST APIs and event-driven architectures with Kafka.
Legacy modernisation
Incrementally moving ageing monoliths to maintainable, modern Java stacks — without stopping the business that depends on them.
Technical consulting
Architecture reviews, technology choices, performance investigations and pragmatic advice from engineers who have shipped in regulated environments.
Staff augmentation
Senior engineers who join your team, adopt your processes and tools, and start contributing from the first sprint.
How we work
Two ways to work with us
Hand us a whole project, or add senior engineering capacity to the team you already have.
Project delivery
You bring the problem, we own the solution. We scope, design, build and hand over working software — with clear milestones and full transparency along the way.
- Discovery & technical scoping
- Architecture and implementation
- Testing, deployment & handover
- Ongoing maintenance on request
Team extension
Need more hands on an existing product? Our engineers integrate into your team, your stand-ups and your codebase — as if they were in-house.
- Senior Java / Spring engineers
- Works inside your tools & processes
- Code reviews & knowledge sharing
- Clean handover when the engagement ends
Experience
10+ years in demanding industries
Our engineers have spent more than a decade building and maintaining software where downtime, data loss and security gaps are not an option.
- 01
Banking & finance
Core integrations, payments and customer-facing portals under strict regulatory and security requirements.
- 02
Telecommunications
High-throughput backend systems, provisioning and event processing at scale.
- 03
Public sector
Reliable, long-lived systems for institutions where stability and accountability matter most.
- 04
Healthcare & medical
Software that handles sensitive data with the care, auditability and compliance it demands.
- 05
Custom software
Bespoke products and internal tools for companies whose needs don’t fit off-the-shelf solutions.
Technology
Our core stack
Deep expertise in the Java ecosystem, proven in production at enterprise scale.
Languages & frameworks
- Java
- Kotlin
- Spring Boot
- Spring Framework
- Vaadin
- Hibernate / JPA
Messaging & integration
- Apache Kafka
- REST / OpenAPI
- Microservices
- Event-driven architecture
Data & delivery
- SQL databases
- MongoDB
- Docker
- Kubernetes
- CI/CD
- Git
Why GreenLeaf
What you can expect from us
Senior by default
Every engagement is handled by experienced engineers. You never pay for someone learning on your project.
Built to last
Readable code, sensible architecture and documentation, so the system stays maintainable long after delivery.
Direct communication
You talk to the people writing the code — no account managers, no lost-in-translation layers.
Enterprise mindset
Security, compliance and reliability are part of the design from day one, not an afterthought.
Let’s talk about your project
Tell us what you’re building or where your team needs help. We usually reply within one business day.