Microservices Architecture & Legacy Modernization
Turn fragile monoliths into stable, scalable systems—without a risky big-bang rewrite.
I modernize legacy systems step by step: Hexagonal and event-driven architectures, microservices where they pay off, and performance tuning down to the bare metal. I rebuilt a crashing C/C++ tool in .NET in 45 days and designed one codebase that runs as a 60+ service cloud platform or as 3 lightweight Windows services.
Who it's for
- Companies stuck with a legacy system nobody wants to touch
- Monoliths that slow down every release and can't scale
- Products that must run both in the cloud and on-premises
- Teams planning a rewrite and looking for a safer path
What you get
- Architecture assessment and a step-by-step migration roadmap
- Clear domain boundaries and Hexagonal (ports & adapters) design
- Event-driven integration with RabbitMQ or MQTT
- Incremental migration with zero downtime
- Performance profiling and optimization
Typical projects
Technologies
- .NET / C#
- C / C++
- Hexagonal Architecture
- Microservices
- RabbitMQ
- Redis
- SQLite
- Kubernetes
Proven in practice
Related case studies from my work.
Bare Metal: 4x throughput on a single-core Celeron
.NET · Multi-threading · Async · Hardware
4x throughput while dropping the hardware requirement to a single-core Celeron with 1GB RAM. Real Bare Metal performance.
Read the case studyHexagonal: 60+ service cloud → 3 Windows services
Hexagonal · Ports & Adapters · Monolith · On-premises
Kubernetes and RabbitMQ swapped for SQLite, MQTT, and in-memory. The full 60+ service cloud platform now runs as 3 lightweight Windows services—without changing a single line of business logic.
Read the case studyMeta-programming: Autonomous Dynamic Reporting
.NET · Blazor · React · DevExpress · NoSQL
Users can now dynamically filter and schedule complex reports autonomously. Eliminated developer bottleneck entirely.
Read the case studyHow we work
A simple, transparent process from first call to production.
- 01
Intro call
We talk about your goals, constraints and timeline. You get an honest first assessment.
- 02
Discovery & proposal
I analyse the problem, your existing systems and the options, then send a clear scope, roadmap and proposal.
- 03
Build in short iterations
Work happens in short sprints with regular demos, so you see progress early and can steer.
- 04
Launch & handover
Production rollout with monitoring, documentation and knowledge transfer to your team.
- 05
Grow
Optional ongoing support, optimization and advisory as your product and team grow.
Frequently asked questions
Should we rewrite our legacy system from scratch?
Usually not in one go. A step-by-step migration—isolating domains, wrapping them behind clean interfaces and moving them one by one—keeps the business running and reduces risk.
Are microservices always the right choice?
No. Microservices add operational cost. I recommend them where independent scaling or deployment really pays off, and a well-structured modular monolith where it doesn't.
Let's talk about your project
Book a 30-minute intro call. You'll get honest first recommendations and a clear next step.
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