Argyl Rebanal

Versatile Backend Software Engineer with more than 5 years of experience building scalable and high-performance applications. Proficient in Node.js, NestJS, TypeScript, GraphQL, Express, MongoDB, and PostgreSQL. Skilled in designing and implementing robust APIs, optimizing databases, and ensuring data security.

Experienced in delivering innovative solutions using cutting-edge technologies across diverse domains, including FinTech, AI, Legal Tech, Social Media, Chat and management systems. Leverages AI-assisted developer workflows and builds internal AI tooling – including Model Context Protocol (MCP) integrations that improves delivery speed and code quality while preserving architecture, review, and validation guardrails. Currently exploring AI Agent Orchestration to coordinate multi-step engineering workflows.

Software Engineer at BarBooks (2023-12 – Present)

• Successfully migrated data for 9 major Chambers clients from the UK, Australia, and Singapore, handling over 28 million data entries and more than 32.7 gigabytes of data, significantly impacting company KPIs and revenue.
• Optimized a wide range of database schemas, significantly reducing migration time for millions of data entries.
• Analyzed highly complex database structures, optimized, and processed an average of 560+ tables per clients database and over 28 million client data entries and gigabytes of data to fit the current system.
• Developed reusable validators to ensure data correctness before importing millions of data entries, saving 97.6% time during migrations by avoiding unnecessary restarts.
• Created and implemented 9 different major migrators for diverse client systems, facilitating smooth transitions and client onboarding.
• Migrated new incoming clients from various data sources including CSV, MSSQL, Couchbase, MySQL, and PostgreSQL into the current system.
• Designed and implemented full-stack features expanding core system capabilities for legal industry SaaS platform.
• Built internal AI developer systems that improved personal productivity by 3x to 5x on selected workflows, while maintaining strict architecture, code review, and validation guardrails.
• Created BarBooks Context Factory, a source-of-truth system for AI rules, context, skills, commands, and synced runtime behavior across Cursor, Codex, and Claude Code — scaling to 39 rules, 25 reusable skills, 40 guardrail hooks, 16 commands, and 14 context documents.
• Leveraged AI-assisted developer workflows to accelerate feature delivery, bug resolution, and safe refactoring, catching issues earlier before QA and production.

Software Engineer at White Cloak Technologies, Inc. (2021-04 – 2023-12)

• Developed and implemented WalletV2, Credit System, Chat Service other services, a cutting-edge digital wallet system, enabling users to securely store, manage, and transfer digital assets.
• Leveraged Amazon QLDB (Quantum Ledger Database) for transaction history, ensuring immutability, transparency, and auditability of financial operations within the WalletV2 system.
• Developed and deployed the Receipt Scanning Service Microservice, allowing users to scan, upload, and extract receipt data using OCR (Optical Character Recognition) technology with enhanced PGP encryption for secure file management and protection.
• Led the design and implementation of complex and ground-breaking product features, leveraging a security-first approach and prioritizing scalability, performance, and comprehensive test coverage.
• Collaborated closely with cross-functional teams to ensure seamless integration, timely and efficient delivery of new features, updates, bug fixes and for the successful project delivery.
• Conducted thorough code reviews to ensure adherence to coding standards, best practices, and maintainability, providing constructive feedback to peers.
• Developed unit tests achieving a test coverage of 90%, ensuring robust code quality and reliability through comprehensive validation of application features.
• Trained and mentored junior backend developers in both basic and advanced NestJS concepts, fostering their skills in developing scalable and efficient applications.
• Deployed to multiple teams such as Swan 1,3,5, Bard, Pollock and Sticky.

Software Engineer Trainee at White Cloak Technologies, Inc. (2020-11 – 2021-04)

• Selected as one of the top 16 applicants from a vast talent pool of over 1000 candidates to join in a rigorous Backend Development Bootcamp at White Cloak Academy, where I gained expertise in cutting-edge technologies such as NodeJS, NestJS, Express, GraphQL, PostgreSQL, MongoDB, Git, and Scrum methodologies.
• Spearheaded a capstone project called Vertex, successfully coordinating with multiple groups to integrate microservices and showcasing coordination skills.

iOS Developer at Hivelabs Technologies, Corp. (2019-07 – 2020-03)

• Contributed to the development of an iOS chat application using Objective-C by designing and implementing programmatic components, leading to a 80% reduction in errors and merge conflicts. This improved the application's stability and streamlined the development process.
• Collaborated with a team to define, design, and ship new features, including the implementation of an MQTT Broker for real-time IoT messaging within the chat application.

Bachelor of Science in Information Technology – Nueva Ecija University of Science and Technology