Sergei Garcia

I led the modernization of Typing.com's teacher portal and internal customer-service dashboard for a platform serving 35+ million monthly users. I wrote over 60% of the new codebase and guided a small team through the migration from Backbone.js to React, Tailwind, and Headless UI alongside the existing PHP/Laravel back end. I also delivered the administrative dashboard migration, covering at least 50 pages, in four months.

Additionally, I used Shape Up to turn stakeholder requests into manageable work, estimate delivery, and communicate directly with leadership. I resolved an architecture disagreement by presenting trade-offs and establishing an agreed direction. I also proposed a GraphQL API architecture for the React Admin migration, including a working demo and risk analysis.

Finally, I established a PR process, issue triage, and a shared design-system component library. I also mentored colleagues, strengthened engineering practices, and earned praise from management and peers for quality, communication, and delivery.

At Deviget, I led the RxVantage front-end development as a JavaScript Architect, connecting pharmaceutical representatives and healthcare providers through appointment scheduling, requests, and meeting logistics. I built it with Vue, Nuxt, Apollo, GraphQL, Vee Validate, lodash, and Vuetify, and wrote Node.js GraphQL resolvers.

I converted product requirements into actionable front-end work, coordinated with the back-end lead to identify blockers and priorities, and shaped architecture decisions as the product took form. I managed and mentored two developers through code reviews and hands-on guidance, strengthening the team's shared understanding of the stack. Management recognized improved delivery speed and technical confidence as a result. The product digitized a previously offline communication process between healthcare and pharmaceutical teams.

At DigitalOnUs, I led full-stack development of the Intelius checkout flow, moving from a legacy Ember application to Vue, Vuex, Nuxt, Express, Apollo, GraphQL, and Node.js. I wrote GraphQL resolvers that streamlined complex relational requests, improved network efficiency, and made the stack easier for developers to work with.

I maintained browser compatibility while modernizing legacy code. I led code reviews across a distributed team and started regular Vue and GraphQL workshops with practical examples to build confidence in an unfamiliar stack. I also coached two junior engineers through monthly career-growth conversations and goal-setting. The proactive workshops and mentoring earned recognition from peers and management.

At Luxoft, I worked across Expedia's booking and advertising products. Modernized the legacy jQuery booking flow using functional programming and reusable components, improving code maintainability. I built React/Redux and Node.js/Express features for a global ad-serving platform.

I also introduced Selenium and Puppeteer browser automation, reporting a 300% improvement in testing speed. This reduced reliance on slow manual test runs, made changes easier to verify, and improved delivery quality and timelines.

At Luxoft, I led the development of a HomeAway hospitality wizard MVP using React, Apollo, and GraphQL, with a Hapi.js/GraphQL server. I took ownership of delivering the MVP while learning GraphQL, which was new to me at the start. I also quickly applied the stack to the project, demonstrating adaptability and the ability to learn a new technology while delivering a working product.

As a full-time senior software engineer at Reddit (2023–2026), I owned the web experience for LLM-translated content across 41 languages and tens of millions of daily users, the surface behind Reddit's largest international growth results of 2024–2026. I redesigned translation indicators, language controls, multilingual reading, compact view, and telemetry. Moving the English translation delivery server-side removed up to 250 milliseconds of unnecessary client work for the 90% of users who never see a translation. I built server-side features consuming GraphQL endpoints, request middleware, partial-page endpoints, and server-to-client data flow, and used BigQuery SQL to measure results.

I built domain-aware AI code-review personas, product-quality rules, and agentic browser verification with Playwright. My editor and browser tools, used across Reddit engineering, made test targeting, experiment reproduction, server-output inspection, and sharing setups possible in one click. I managed three front-end engineers, onboarded every front-end contractor who joined after me, wrote guides for engineers and AI agents, and created a company-wide AI fluency course on productive, cost-aware agentic workflows.