Javier Roque

Senior Software Engineer

📧 jarb95@gmail.com 🌐 javier.dayby.dev 📍 Remote / Available Globally 🎂 March 14, 1995

Professional Summary

Over twelve years of experience in full-stack web development for high-traffic e-commerce and social platforms, ranging from large enterprises to startups. Proficient with multiple e-commerce, POS and payment related APIs including Shopify, CreditVault, Stripe, and others. Certified SCRUM master with strong leadership skills in both onsite and remote settings. Additionally, engaged in side projects leveraging Large Language Models (LLMs) from the Hugging Face community to pioneer a new user experience model. This involves using LLMs to enable controlled and supervised CRUD operations on user profiles through intent recognition, demonstrating a commitment to applying AI technologies to enhance user interactions and system capabilities.

Technical Skills

Languages:
Solidity, JavaScript, Ruby

Frameworks:
Ethereum, ActiveRecord, Flipper, Django

Databases:
PostgreSQL, MySQL, MongoDB

Tools & DevOps:
Smart Contracts, Feature Flags, Audit Log Systems

Key Projects & Experience

Decentralized Gambling Platform Development

Developed a decentralized gambling site using Solidity and smart contracts on the Ethereum blockchain. Addressed security challenges and optimized gas costs to ensure a fair and efficient system. Implemented secure random number generation for autonomous transaction execution. Enhanced understanding of blockchain technology and decentralized applications, focusing on thorough testing and security best practices.

Controlled Feature Rollouts with Feature Flags

Implemented feature flags using Flipper to enable controlled feature rollouts and internal testing. Improved deployment safety and facilitated A/B testing by catching bugs early in the development process. Emphasized disciplined flag management to maintain a clean codebase, enhancing the flexibility and reliability of software releases.

Audit Log System for Compliance and Security

Developed an audit log system to provide traceability of sensitive user actions, integrating seamlessly with ActiveRecord callbacks. Ensured compliance by capturing immutable records while balancing privacy and thoroughness in logging event context. Enhanced security measures and met compliance requirements within the system.

Technical Writing & Community Involvement

Technical Writing and Community Involvement

Recent technical articles and insights:

Leveraging Feature Flags for Controlled Feature Rollouts - Explored the implementation of feature flags using Flipper to facilitate controlled feature rollouts, enhancing bug detection and providing a deployment safety net. Highlighted the dual role of feature flags in A/B testing while emphasizing the need for disciplined flag management.
Enhancing Compliance and Security: Building an Audit Log System - Developed a robust audit log system to capture traceable user actions, integrating seamlessly with ActiveRecord callbacks. The project balanced comprehensive logging with privacy, meeting compliance needs and boosting system security.

Education & Continuous Learning

Continuous Professional Development - Engages in self-directed learning by regularly writing and maintaining a personal tech blog that explores and explains backend development concepts, new technologies, and best practices. Committed to lifelong learning and staying current with the latest advancements in the field.

Technical Knowledge Sharing - Actively contributes to the developer community by participating in online forums, offering insights on backend development challenges, and publishing detailed tutorials and code snippets. Regularly attends and speaks at local tech meetups and webinars to share expertise and foster collaboration.

Practical Application - Undertakes complex backend projects, including developing scalable APIs and optimizing server performance. Demonstrates proficiency in multiple programming languages and frameworks through real-world applications, continuously refining skills by tackling diverse and challenging projects.

Javier's CV