Senior Java Software Engineer | High-Throughput Distributed Systems & Enterprise Architecture
builtbyjuls.com | LinkedIn | Resume | Email
Senior Java Software Engineer with 9+ years of experience delivering high-throughput enterprise platforms across energy market, banking, and HR domains. Specialized in Java (8/11/17/21), Spring Boot microservices, PostgreSQL query optimization, distributed messaging (RabbitMQ), and resilient automated test gates.
- 50-90% Latency Reduction: Redesigned PostgreSQL schema, query rewrites, and composite indexing for multi-tenant energy platforms.
- 90% Ingestion Latency Cut: Optimized time-series pipeline via JDBC batching and parallel validation with 100% data integrity.
- 99.9% Production API Uptime: Sustained high-availability customer-bank messaging services for hundreds of market participants.
- 20% to 80% Test Coverage: Elevated automated test suites across trade-finance banking modules using JUnit, Mockito, and Testcontainers.
JUnit 5 Test Gate for Hibernate N+1 Query Loops & AI-Driven Remediation
- Catches accidental N+1 query cascades in automated test suites via datasource-proxy query interceptors.
- Executes isolated PostgreSQL
EXPLAIN (FORMAT JSON)query plans inside rollback-safe JDBC savepoints. - Generates compile-ready Java remediation suggestions using Spring AI and Redis caching.
- Stack: Java 21, Spring Boot, Spring AI, PostgreSQL, Testcontainers, Redis 7.
2. simplifeyn
Richard Feynman Technique PR Reviewer & Agent Skill
- PR code reviewer and Agent Skill that explains complex architectural pull requests using the Richard Feynman mental model.
- Structures explanations through physical causality, tangible everyday analogies, audience calibration ladders, and edge-case ice-water tests.
- Available as a GitHub Action and portable AI skill.
| Domain | Technologies & Practices |
|---|---|
| Languages & Core | Java (8, 11, 17, 21), SQL, TypeScript |
| Frameworks & Architecture | Spring Boot, Spring Data JPA, Hibernate, REST APIs, Microservices, System Design |
| Databases & Messaging | PostgreSQL, MariaDB, SQL Server, Redis, RabbitMQ, JDBC Batching |
| Testing & Quality | JUnit 5, Mockito, Testcontainers, Integration Testing, Vitest |
| DevOps & Cloud | Docker, Kubernetes, AWS (ECS, RDS, S3, SQS), Linux, CI/CD, Maven, Gradle |
- Senior Java Software Engineer - Exist Software Labs, Inc. (Jan 2020 - Oct 2025)
- Software Engineer - Exist Software Labs, Inc. (Apr 2016 - Dec 2019)
- Education: Bachelor of Science in Information Technology - Pamantasan ng Lungsod ng Valenzuela (2016)
This repository is both the GitHub Profile repository for @builtbyjuls and the source code for the personal portfolio at builtbyjuls.com.
- Framework: Angular 21 with zoneless change detection and SSR/prerendering (
@angular/ssr) - Styling: Pure SCSS with high-contrast typography, responsive layout, and zero heavy UI libraries
- Deployment: Cloudflare Workers serving static prerendered assets with SPA fallback
npm ci
npm startThe local server runs at http://localhost:4200.
npm run check
npm run format:check