Backend development
Design and implementation of reliable backend services using Java, Spring Boot, relational databases, and modern software engineering practices.
Tycbit / Independent engineering
Software engineering for complex systems and integrations.
Tycbit helps companies design, build, and improve reliable backend systems, APIs, integrations, and internal software.
Independent software engineering by tycbit.
SYSTEMS / WORKFLOWS / INTEGRATIONS
▦ ERP
⌁ Payments
□ E-Invoicing
◫ Internal tools
TTycbit
engineeringAPIs · boundaries · reliability
engineeringAPIs · boundaries · reliability
→Reliable software workflows
From business process to maintainable implementation.
01 / Services
Software engineering services.
Practical engineering support for products, platforms, and business-critical systems.
API design and development
REST API design, third-party integrations, authentication, validation, error handling, and maintainable API contracts.
System integrations
Connect ERP systems, payment providers, invoicing platforms, external services, and internal applications.
Internal tools and automation
Build software that replaces manual processes, improves operational workflows, and gives teams better visibility and control.
Legacy modernization
Improve existing systems incrementally through refactoring, architecture changes, API layers, testing, and safer deployment practices.
Technical product development
Turn business requirements into working software, from early architecture and MVP development to production deployment and improvement.
02 / Technical expertise
Tools and patterns for reliable software.
Backend
Java · Spring Boot · REST APIs · Maven · JPA and Hibernate · PostgreSQL · SQL · Flyway
Architecture
Modular monoliths · Multi-tenant systems · Provider-independent integrations · Event-driven workflows · Idempotency · Reconciliation · API security · Domain modeling
Quality and testing
JUnit · Mockito · AssertJ · Testcontainers · MockMvc · Integration testing · Architecture testing
Infrastructure
Docker · Linux · GitHub Actions · CI/CD · Caddy · Cloud and VPS deployment · Monitoring and observability
Additional experience
Laravel · Vue · Python · Desktop and internal tooling · Workflow automation
03 / Selected work
Products, integrations, and practical engineering.
A selection of products, integrations, and engineering projects developed through Tycbit.
Tycbit product↗
Product development · Payments · E-Invoicing
Tycbit Flow
A provider-independent integration and orchestration platform connecting ERP systems, POS providers, acquirers, and electronic invoicing services.
- ✓Unified payment intent API
- ✓POS and acquirer routing
- ✓Electronic invoicing workflows
- ✓Multi-tenant architecture
- ✓Reconciliation and idempotent operations
Client project↗
API development · System integration
Karpodinis POS API
A backend API and integration layer supporting POS-related workflows and communication between business systems and external providers.
- ✓Backend API development
- ✓External provider communication
- ✓Business workflow integration
Client work↗
Automation · Internal tools
Business process automation
Custom software for automating data collection, processing, synchronization, and operational workflows that would otherwise require manual work.
- ✓Data collection and processing
- ✓System synchronization
- ✓Operational workflow automation
04 / How tycbit works
Direct, thoughtful, incremental.
Understand the workflow
Start from the real business process, existing systems, constraints, and failure cases before selecting a technical solution.
Design clear boundaries
Separate core business logic from providers, infrastructure, and external system details.
Build for reliability
Use testing, idempotency, traceability, validation, and predictable error handling for business-critical workflows.
Deliver incrementally
Prefer small, production-ready improvements over unnecessary rewrites and oversized architecture.
05 / About tycbit
Independent engineering, direct collaboration.
Tycbit is an independent software engineering business focused on backend development, integrations, internal tools, and technical product development.
Tycbit works primarily with Java and Spring Boot systems, particularly where software must communicate reliably with external providers, business platforms, payment infrastructure, invoicing systems, or legacy applications.
Clients work directly with the engineering team designing and implementing the solution.
Ways to work together
Good work starts with a clear problem.
- +Freelance software development
- +Contract engineering
- +Backend and API consulting
- +Integration projects
- +Product prototyping
- +Ongoing technical support
06 / Start a conversation
Have a software or integration challenge?
Tell tycbit what you are building, what systems need to connect, or where your current implementation is causing problems.