Full Stack Developer

Reynerio Sarmiento

Revere, MA ***** *****************@*****.*** (617) 320 – 9924

https://www.linkedin.com/in/reynerio-s/ https://www.reynerio-sarmiento.com/ Technical Skills

Languages & Frameworks:React.js, JavaScript, HTML/CSS,Express/Node.js, Java, Python, Vue.js, Material-UI, Spring Boot, Flask, REST APIs

DevOps & Cloud:AWS, Docker, Kubernetes, Helm, Jenkins,Git, GitHub, HashiCorp Vault, Rafay Systems, JFrog Artifactory, Akamai NetStorage

Testing & Tooling:React Testing Library, Jest, Vite,Visual Studio Code, Subversion, Netlify Databases & Infrastructure:MySQL, Oracle, Kong APIGateway, DataPower, Linux/UNIX, Windows, MacOS Experience

MassMutual Full Stack Developer May 2022 - July 2025

● Worked within across-functional teamtasked withworking withcustomer facing B2B applicationswithinthe Institutional Insurance space at MassMutual

● BuiltTax Withholding and Direct Deposit FormsinReact.js/Redux Form, usinguseState, useEffectfordynamic input controlandconditional field states;served200–400 peak userswith real-time validation andresponsive UI feedback

● Refactored shared React components into anNPM package(via JFrog Artifactory) used by the Customer Service and User Login Portals(800K+ users); maintainedstableversioningacross environments

● Built aJSON-drivenalert system integrated withAkamaiNetStorage;cachedconfigs triggereddynamic frontend alertsbased on active JSON attributes.

● Collaboratedwith UI/UX designers to build a newStableValue portalinReact.js (300+ users), enabling usersto search Asset Accounts and view market/book values, credit rates, and related documents through a responsive, user-friendly interface

● Built aReact.js document tablein the Stable ValuePortal withclient-side filtering,pagination, andcheckbox controlsfor individual or bulk PDF selection anddownload, ensuringefficient state managementanda responsive UI

● Integrated internalBlueprint UI libraryacross allfront-end applications to ensureconsistent branding,styling, and component behaviorthroughout the product suite.

● UtilizedGithub Copilotto enhance development workflowsby generatingunit tests, improvingcode documentation, refactoringlegacy code, fixingbugs, andoptimizingperformance The TJX Companies Inc. Engineer I Jan 2021 - Apr 2022

● Migrated750+ global usersfrom TM1 to SaaS (PlanningAnalytics) with a 6-person Agile team.

● Developed125+ data integrationsusing Control M andMove-IT Automation.

● Coordinated acrosssecurity, infrastructure, and businessunits to meet project goals.

● Executedtestingandproduction deployment workflowsacross multiple environments. Vertex Pharmaceuticals Web Development Intern Jun 2019 - Aug 2019

● Built a website for internal policy docs(2,000+ users)usingFlask,Vue.js,andSQLDeveloper

● CreatedRESTful APIendpoints and implementedJSONparsing logicfor document categorization. Community

Hack.Diversity Tech Co-Lead Alumni Leadership Council Jan 2020 - Dec 2020

●The Alumni Leadership Council partners with Hack.Diversity to support alumni growth as impactful, representative leaders shaping the future of tech.

●Help organize andlead a web development teamof 9to create a web platform for Alumni (Gastby.js and Material-UI) Education

University of Massachusetts Boston, B.S Computer Science 2020 Major: Computer Science Minor: Mathematics

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