Hi, I'm Lewis Perez
Full Stack Developer & AI Specialist
Crafting innovative web solutions with modern technologies. Passionate about creating exceptional user experiences and scalable applications that push the boundaries of what's possible.
About Me
Enterprise-grade reliability with adaptability and measurable impact
Senior Software Engineer with 8+ years' experience building secure, scalable microservices and APIs across banking and telecom, complemented by full‑stack freelancing (React/Next.js/Shopify) in Australia. My strengths lie in Java, Spring Boot, PostgreSQL, and AWS, with proven results including 500ms→200ms latency reductions, +30% throughput gains, and 40% faster data migrations.
I combine enterprise rigor with product speed—optimizing APIs, data flows, and cloud services while coaching teams to deliver. My career journey spans from IBM's global enterprise systems to ING's secure banking microservices, and now includes e-commerce optimization for Australian businesses while pursuing advanced studies in cybersecurity and telecommunications.
Focused on cloud‑native architecture, performance optimization, and mentoring, I'm building toward Solutions Architect or Engineering Lead roles. I thrive in feedback-driven environments where I can deliver measurable business impact while fostering team growth and technical excellence.
Enterprise Experience
8+ years in banking & telecom with secure, scalable systems
Global Perspective
Cross-cultural experience from Philippines to Australia
Team Leadership
Mentored juniors, boosted team velocity +15%
Performance Expert
Proven track record of optimization and measurable impact
Experience
8+ years of enterprise software engineering with measurable impact
Deliver end‑to‑end e‑commerce builds and optimizations using Shopify, Liquid, React/Next.js, and secure payment integrations. Gather requirements, design, implement, and monitor performance/uptime.
Key Achievements:
- Launched Shopify store with custom theme and checkout optimizations; conversion +20% in 3 months
- Integrated Stripe/PayPal and shipping APIs with PCI‑compliant flows; maintained 99.9% uptime
- Reduced support tickets ~30% by improving docs and self‑serve admin workflows
- Troubleshot platform incidents to <2 hours downtime per issue
Technologies:
Designed and optimized Spring Boot microservices for customer onboarding; implemented secure, reusable API layers with validation, exception handling, and AES‑256 encryption. Mentored junior engineers and led Agile ceremonies.
Key Achievements:
- Reduced API response time from ~500ms to ~200ms; onboarding throughput +30%
- Standardized exception handling and validation layers, lowering recurring defects
- Mentored 3 junior engineers; sprint velocity +15%
Technologies:
Developed and maintained Java‑based telecom applications; resolved defects, optimized data flows, and improved system availability in a high‑reliability environment.
Key Achievements:
- Improved database query efficiency ~30% via execution‑plan analysis and refactoring
- Reduced recurring incidents ~25% by fixing memory/resource issues and adding monitoring
- Maintained 97%+ system availability while supporting priority incidents
Technologies:
Delivered enterprise Java features and large‑scale data migrations; collaborated across global teams to meet delivery timelines under strict quality controls.
Key Achievements:
- Built multithreaded migration utility to move 16M+ records into ElasticSearch; migration speed +40%
- Reduced post‑release bugs ~15% by instituting stronger test cases and regression checks
- Improved cross‑timezone collaboration, cutting resolution time ~20%
Technologies:
Operations role emphasizing compliance, process discipline, and incident response in a regulated environment.
Key Achievements:
- Contributed to 100% internal audit compliance through process adherence and documentation accuracy
- Resolved operational issues within SLA (e.g., <15 minutes per incident) via structured triage
Technologies:
Featured Projects
Enterprise solutions and freelance work showcasing measurable impact
Custom Shopify store with theme development, secure Stripe/PayPal integrations, and checkout optimizations; analytics‑driven iteration to lift conversions.
Technologies:
Personal portfolio integrated with a headless CMS for projects, blog, and case studies. Focus on performance, SEO, and modern UI.
Technologies:
Designed and implemented the ING Business Onboarding Orchestration API to streamline customer's business onboarding processes. Improved system performance and reliability by optimizing API workflows, reducing response times, and increasing throughput. Established standardized validation, exception handling, and security best practices to ensure compliance and scalability across business-critical services.
Technologies:
Multithreaded Java tool to migrate 16M+ records into ElasticSearch with integrity checks and logging for traceability.
Technologies:
Led a cross-functional team to deliver an enterprise automation framework for telecom operations. Focused on automating BAU (Business-As-Usual) tasks to reduce manual workload, improve accuracy, and accelerate delivery timelines.
Technologies:
Designed and delivered an interactive Digital Twin Portfolio showcasing how AI-powered agents can be integrated with modern web technologies. Built a working prototype that demonstrated real-time data interaction, customizable digital personas, and automated workflows for professional portfolios and enterprise use cases.
Technologies:
Skills & Expertise
Enterprise-grade technologies with proven results
Additional Skills & Technologies
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Get In Touch
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Location
Melbourne, VIC, Australia
Ready to collaborate?
I'm always open to discussing new opportunities and interesting projects.