Services
What I can do for you
Architecture & Backend
I design and build backend systems in Java and Spring Boot — from microservices and REST APIs to telecom protocol integrations (GTP, SNPP, SOAP). Hands-on experience with telecom systems processing data from entire national networks.
Performance Optimisation
Java application profiling and optimisation. Memory analysis (JProfiler, Eclipse MAT), Redis/Kafka/Hazelcast tuning. PostgreSQL optimisation — partitioning, indexing, complex queries on high-volume data.
DevOps & Infrastructure
I build and manage server infrastructure. Docker, Incus, WireGuard VPN, HAProxy, Nginx. CI/CD automation and monitoring (Prometheus, Grafana).
Application Security
OAuth2 and Keycloak — SSO, identity management, roles and permissions. Spring Security, JWT, rate limiting in distributed systems. mTLS between components, LUKS disk encryption, certificate-based auth (PKI). Geo-blocking and infrastructure-level protection.
Frontend Development
Web applications in Vue.js and Nuxt with SSR, login panels (Basic Auth, JWT, OAuth2), internationalisation (i18n). Experience with React and Angular too — rewrote an application from GWT to React.
System Modernisation
Enterprise system migration and modernisation — WebLogic to modern stack, Oracle to PostgreSQL, Redis to PostgreSQL, SOAP to REST. I've rewritten large systems with zero downtime.
Open-Source Solutions
I deploy and configure: Stalwart Mail / Mailcow (mail server), Nextcloud (private cloud), monitoring (Prometheus/Grafana), VPN (WireGuard).
Business offer
Your infrastructure. Your data.
I set up complete IT environments for companies — mail server, private cloud, VPN and custom software. Everything on your hardware. Zero Google, zero external services, full control.
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Technologies & tools
Interested in deploying your own infrastructure? Describe your needs — I'll find the right solution for your company's size and profile.
Contact me