Workshop

Personal projects

Things I build for myself: runnable demos, case studies, and the systems behind this site. Client work is in the case studies.

Copybook Converter

Live demo

Converts COBOL copybook definitions into Java classes, a JSON Schema, and a sample JSON object. Paste a copybook and try it live.

JavaSpring BootJacksonSwagger / OpenAPI
Try the live demoRead the case study

Batch Processing Under Failure

Simulation

An interactive simulation of a checkpointed batch job. Inject a failure, restart from the checkpoint, and check that nothing is processed twice. Illustrative, not client code.

Chunk processingCheckpointsRestartIdempotency
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This Portfolio

Case study

The site you are reading, as an engineering system: email-verified résumé requests, server-side bot checks, a grounded AI assistant, and a free-tier hosting stack.

Spring BootNext.jsPostgreSQLFlyway
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AI Career Assistant

Live demo

Answers questions about my background from an approved knowledge base, and says so when the answer isn't there rather than guessing.

Spring AIGemini APIRate limiting
Ask the assistantRead the case study

Developer tools

Small tools for everyday Java and Spring work. Each runs in your browser; nothing you paste is sent or stored.

Spring Boot config checker

Paste application.yml and get warnings for plain-text secrets, unsafe schema settings, duplicate keys and more.

Open the tool →

SQL to Spring Data JPA

Turn a simple SELECT into the equivalent derived-query method, and flag what needs a @Query instead.

Open the tool →

Stack trace explainer

Find the root cause and the first frame in your code, with checks for common Spring and JVM failures.

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Code structure and indentation checker

Check Java, JavaScript or Python for unbalanced brackets, inconsistent indentation and class-structure mistakes, and re-indent.

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Vulnerability report explainer

Paste a vulnerability report and get each finding explained in plain language, with an example and how to fix it.

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SQL query builder

Build a PostgreSQL SELECT from a few fields, with values bound as named parameters.

Open the tool →