Java & Spring Boot
REST API development, microservices, Hibernate, and mission-critical enterprise backends.
Spring BootHibernateREST
Enterprise background
My focus today is custom Python chatbots. This page is the story behind it: 20+ years of Java and Spring Boot engineering across finance, government, industry, logistics, real estate and ERP. It's why the bots I ship are reliable, observable and maintainable — not weekend demos.
The through-line
Two decades of making systems that can't go down
REST API design, legacy modernization, JVM profiling and performance work, third-party integrations, and troubleshooting production systems that businesses depend on. That discipline is exactly what a chatbot needs once it's carrying real customer traffic.
Now · Current focus
Custom Python chatbots
Building and supporting WhatsApp, Instagram and Telegram bots for business — see the home page.
PythonFastAPIClaude / OpenAI
2021–2024 · Enterprise reporting
Keikai & spreadsheet solutions
Five years integrating Keikai into enterprise apps for custom reporting and financial analysis. Detail on the ZK & Keikai page.
KeikaiZK 10Spring Boot
Ongoing · Long-standing specialism
ZK Framework, version 3 through 10
Deep experience across every major ZK generation, custom components and phased migrations. Official ZK partner.
ZK 3–10Custom components
Since the 2000s · Foundation
Java & Spring Boot architecture
20+ years of reliable, scalable web applications: REST APIs, fixing legacy backends, integrations, and keeping production systems alive.
JavaSpring BootHibernateSQL
Enterprise expertise
What I can be hired for beyond chatbots
When a project needs deep backend work, this is the ground I've covered for two decades.
Legacy modernization & performance
Safe upgrades and refactoring without disrupting users, JVM profiling and finding bottlenecks on server and UI.
JVM profilingRefactoring
Databases & integrations
MySQL, PostgreSQL/PostGIS, SQL Server and Oracle; query optimization for large datasets and third-party integrations.
PostgreSQLMySQLOracle
Selected enterprise work
Systems in production, not prototypes
Enterprise platforms I designed, built or rescued — several still running years after delivery.
Financial Planning & Analysis
Consolidates complex financial and operational data so organizations can generate custom reports, visualize trends and make confident decisions across business units.
- Stack
- Spring Boot, ZK, Keikai, AWS
- Impact
- Keikai integration enabled custom reporting and streamlined financial analysis
- Users
- Enterprise and public-sector organizations across the USA
Dynamic Public Safety
Law enforcement software built from the ground up for complex criminal justice workflows — case management, reporting and multi-agency data exchange.
- Stack
- Java, ZK, MySQL, Hibernate, Tomcat
- Impact
- Improved UI responsiveness and scalability for statewide deployments
- Users
- Law enforcement agencies across the USA
CCS — Contract Control Suite
A contract management system centralizing lease agreements, approvals, document storage and audit trails, with previews, approval workflows and fine-grained access control.
- Stack
- Java, ZK, SQL Server, Hibernate, Tomcat
- Impact
- Increased contract transparency and reduced manual errors
- Scope
- Multi-department enterprise usage
Dynamic Inventory
An inventory system to track products, suppliers, purchases and sales from a single interface, with reusable UI components and optimized queries for large datasets.
- Stack
- Java, ZK, MySQL, Hibernate, Tomcat
- Impact
- Delivered real-time stock visibility across departments
Energy Management & Control
Collecting, processing and visualizing energy consumption data to support management decisions, with dashboards and reporting that helped identify inefficiencies.
- Stack
- Java, ZK, MySQL, Hibernate, Tomcat
- Impact
- Helped enterprises reduce operational costs
Interactive Fleet Map
Real-time vehicle tracking that visualizes live locations and historical routes on an interactive map, so transport operators can monitor fleet activity as it happens.
- Stack
- Java, ZK, OpenLayers, PostGIS, Tomcat
- Impact
- Improved fleet visibility and operational control
Real Estate Agency Management
A platform helping real estate agencies handle leads, properties, clients, appointments and reporting in a single system.
- Stack
- Java, ZK, MySQL, Hibernate, Tomcat
- Impact
- Centralized client and property management
Adempiere + Compiere ERP Integration
Integration of Adempiere WebUI with Compiere into a unified ERP solution with functionality beyond either system alone — extending ERP without replacing it.
- Stack
- Java, ZK, Oracle Database, JBoss
- Impact
- Expanded ERP functionality without a costly rewrite
Clients & partners
Companies I've worked with
Enterprise and long-term engagements.
Need a bot built on this kind of foundation?
The chatbots are the focus — the enterprise experience is what makes them dependable.