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Jefferson V.
@jeffersonvalle
Full Stack Expert in High Performance Systems: NodeJS, TS, React
Spain
English, Spanish
About me
Hey! I’m a Software Engineer with 5+ years of experience building real-world MERN (Node, React, TypeScript) applications. I design user-driven, scalable systems that save costs and boost performance, such as cutting DB costs by 71% or decreasing job executions from hours to 2 minutes. Using my circular knowledge in backend, frontend, and cloud, I can completely build entire vertical stacks fully ready for production. Let's discuss further your ideas!
Skills
Jefferson V.
Offline •
See my services
API & Integrations
I will build scalable nestjs or nodejs rest API endpoints
Work experience
LambdaLoopers
Full-time • 4 yrs
Technical Lead
Oct 2024 - Nov 2025 • 1 yr 1 mo
EdTech & Robotics Solutions ● Technical lead for multiple projects, integrating WebApps with embedded hardware and AI models. ● Enhanced computer vision algorithms (YOLO) and integrated OpenAI models to automate student task grading while maintaining a rigorous testing suite to ensure system robustness. ● Developed a MicroPython framework simplifying the native firmware API for teaching robotics to the students ● Created web-based terminals and IDEs using Monaco (Web VSCode) and our custom lintern system enabling students to debug their written code ● Improved platform reliability by implementing advanced monitoring using Sentry and customized alerting within Google Kubernetes Engine (GKE). ● Applied UI/UX changes for our internal backoffices using Laravel/Filament and Nest.js automating manual processes and enhancing data reporting accuracy.
Software Engineer
Feb 2022 - Sep 2024 • 2 yrs 7 mos
Enterprise Cloud & Digital Workspace Orchestration ● Reduced MongoDB costs by 71% in less than 2 months by optimizing data structures, indexes, migrating legacy collections, enforcing clear data retention policies, and preparing the database for horizontal scaling. ● Optimized scheduled jobs, cutting down their processing time from several hours to less than 2 minutes. ● Led architecture meetings to standardize modular patterns and best practices across multiple microservices. ● Implemented IaC to ensure replicable environments and designed CI/CD pipelines with GitHub Actions for automated testing and deploys. ● Built and maintained high-volume data pipelines using Azure Event Hubs, Azure Functions, Redis and Node.js ● Coded in Node.js and TypeScript to develop a variety of new features to provide value to the users and clients, such as implementing complete modules from start to finish or adding new endpoints for data visibility. ● Applied error handling and monitoring to our systems by using Azure Alerts, Better Stack, Sentry, and Grafana for quickly understanding the health of the system and taking immediate actions before the users notice any problems.
Lead Frontend Developer
Jul 2022 - Nov 2022 • 4 mos
Football NFT Marketplace ● Took ownership of end-to-end implementation of the NFT Marketplace and part of the card-pack opening initiative, translating complex Figma specifications into production-ready features in a quickly changing environment. ● Architected component libraries based on Atomic Design principles using Next.js, enabling rapid design iterations and ensuring UI consistency across the platform. ● Proactively coded Python (Django Rest Framework) endpoints to alleviate the workload of the back-end team, ensuring that the milestones were met on time. ● Worked on the development of dynamic filtering systems and state management based on the available cards and the applied filter to ensure that any new metadata added to the schema were being displayed without changing any single line of code.
