Diego Torres — Senior Full Stack Engineer & Team Leader

Full stack developer based in Guayaquil, Ecuador with 7+ years of experience building scalable web and mobile applications. Specializing in React, Next.js, Vue, Svelte, SvelteKit, Angular, React Native, Flutter, Node.js, Nest.js, Python, Django, FastAPI, Flask, Three.js, D3.js, TypeScript, PostgreSQL, MongoDB, AWS, GCP, Azure, Docker, and CI/CD. Helped startups launch MVPs in 7-8 weeks, reduce development costs by 30%, and scale applications to 100,000+ users. Available for freelance, contract, and full-time opportunities worldwide. Experienced in fintech, healthcare, e-commerce, edtech, real estate, logistics, marketing technology, fitness, and SaaS industries.

Key skills: React Developer, Next.js Developer, Node.js Developer, Full Stack Engineer, React Native Developer, Mobile App Developer, Frontend Engineer, Backend Engineer, Team Leader, TypeScript Expert, Python Developer, Vue.js Developer, Svelte Developer, SvelteKit Developer, Angular Developer, Three.js 3D Developer, Web Application Developer, API Developer, Startup Technical Co-founder, MVP Builder, Freelance Developer Ecuador.

Available for work

Diego Torres

Senior Full Stack Engineer

Team Leader · Web & Mobile · Guayaquil, Ecuador

Helping startups launch MVPs in 7-8 weeks, reduce costs by 30%, and scale to 100K+ users. From 3D experiences to robust APIs - clean, scalable code with speed at the forefront.

From MVPs to scale-ready products

Startups move fast, but technical execution often lags behind. I've seen this stall MVPs, break user experiences, and delay funding rounds. As a senior full stack engineer, I specialize in solving these problems across web and mobile platforms.

Whether it's high-performing landing pages, fully custom applications, API design, or 3D experiences - I focus on writing clean, scalable, and flexible code with user outcomes in mind and speed at the forefront.

My stack spans React, Next.js, Svelte, Angular, Vue, and React Native on the front end, with Node.js, Nest.js, Python(FastAPI, Django, Flask), PostgreSQL, and MongoDB on the back. I deploy via AWS, Cloud Functions, and robust CI/CD pipelines.

0+
Years Experience
0k+
Users Scaled To
0%
Cost Reduction
~0
Week MVP Launch

Skills & Expertise

100+ Technologiesacross 10 categories
◆

Frontend Frameworks

ReactNext.jsVue 3Nuxt.jsAngularSvelteSvelteKitReact NativeExpoGatsby
◈

State & Architecture

ReduxZustandPiniaNgRxMobXReact QueryContext APIVuexRxJSSignals
◇

3D, Graphics & Data Viz

Three.jsReact Three FiberD3.jsChart.jsWebGLGSAPLottieCanvas APIRecharts
✦

Styling & UI Systems

Tailwind CSSBootstrapMUISass/SCSSCSS ModulesStorybookRadix UIFramer Motion
⬡

Languages

JavaScriptTypeScriptPythonHTML5CSS3SQLGraphQLBashMarkdownJSON/YAML
◈

Backend & APIs

Node.jsNest.jsExpressDjangoFlaskFastAPIREST APIsGraphQLWebSockets
⬢

Databases & BaaS

PostgreSQLMongoDBMySQLRedisFirebaseSupabasePrismaMongooseTypeORM
◎

Cloud & Infrastructure

AWSGCPAzureDockerVercelNetlifyLambdaCloud FunctionsS3CloudFront
⊡

DevOps & Testing

GitGitHub ActionsCI/CDJestCypressVitestPlaywrightWebpackViteTurborepo
⬣

Tools & Workflow

FigmaClickUpMonday.comTrelloJiraAgile/ScrumPostmanDocker ComposePrettier

Work Experience

MAR 2022 — JUN 2025

Full Stack Engineer — Team Leader

Business Brokerage Services, LLC

Led & mentored a cross-functional team of 5 engineers across frontend, backend & DevOpsArchitected and shipped a business listing portal from zero to production in under 8 weeksSlashed page load time from 5s → under 1s via code splitting, lazy loading & CDN optimizationDesigned and launched a role-based admin dashboard with granular access control in 3 weeksIntegrated Stripe payment processing & DocuSign e-signature APIs for end-to-end deal flowEstablished CI/CD pipelines with GitHub Actions — automated testing, linting & zero-downtime deploysImproved overall dev velocity by 22% through sprint planning, code reviews & Agile best practicesReduced tech debt by 25%+ via strategic refactoring, modular architecture & shared component libraryManaged stakeholder communication, sprint demos & cross-team alignment across product & engineeringChampioned TypeScript adoption and enforced coding standards that reduced production bugs by 40%
AUG 2020 — JAN 2022

Frontend Engineer — Web & Mobile

Beagle

Owned end-to-end UI development for a mobile-first fintech app serving thousands of active usersBuilt the web platform first using React & Next.js with SSR, then developed the internal mobile appDelivered pixel-perfect implementations from Figma designs in React Native & FlutterEngineered a scalable, reusable design system with Tailwind CSS — 50+ shared componentsDecreased user bounce rate by 24% through UX improvements, faster rendering & A/B testingReduced mobile bundle size by 20% via tree shaking, dynamic imports & asset optimizationIntegrated Firebase Authentication, Cloud Messaging & push notification infrastructureImproved onboarding UX flow — increased new user completion rate significantlyCollaborated closely with product, design & QA teams in a fast-paced Agile environmentWrote comprehensive unit & integration tests to ensure cross-platform reliability
FEB 2019 — AUG 2020

Full Stack Developer

Investi

Developed a full legal case tracking web application from the ground up — frontend to deploymentBuilt scalable REST APIs with Node.js & Python powering dynamic dashboards and reporting toolsIncreased test coverage from 20% → 80% with Jest & integration tests, reducing regressionsAutomated data entry pipelines that saved 50+ hours per month in manual processingEngineered multi-tenant access control supporting 300+ concurrent users with role-based permissionsShipped new features every 2 weeks following Agile sprints with stakeholder sign-offReduced support tickets by 35% through proactive UX fixes and error handling improvementsDesigned and normalized database schemas in MongoDB for high-throughput query performanceEnabled real-time data updates using WebSockets for live case status trackingDocumented APIs and onboarded junior developers — improving team ramp-up time by 50%
OCT 2017 — JAN 2019

Full Stack Developer

Medtronic

Contributed to a mission-critical internal analytics dashboard used daily by healthcare teamsBuilt complex, data-heavy visualizations with D3.js & Chart.js — interactive charts, heatmaps & graphsConnected React frontend to Python-based REST APIs for real-time data ingestion & displayDesigned and implemented a HIPAA-compliant user permission layer with audit trail loggingAutomated reporting workflows for 5 departments — eliminating hours of manual report generationReduced API response time by 38% through query optimization, indexing & caching strategiesCollaborated with QA to implement automated testing — reduced production bugs by 30%Worked within strict healthcare compliance standards ensuring data security & patient privacyParticipated in code reviews, technical planning & cross-team architecture discussionsDelivered production-ready features on tight deadlines within a regulated enterprise environment

Selected Projects

30+
Screens
40+
API Endpoints
iOS+Android
Platforms

Move Together — Fitness App

Full-stack fitness app with native HealthKit & Google Fit integration for real-time step tracking, gamification with points and leaderboards, gift card rewards via Runa, RevenueCat subscriptions, and custom native modules for background step sync across iOS and Android.

React NativeExpoTypeScriptZustandNode.jsRevenueCatHealthKitGoogle Fit
5→1s
Load Time
22%
Faster Dev
25%
Less Debt

Business Listing Portal

Internal portal for managing business listings with role-based access control, secure payment integration, and DocuSign e-signature workflows. Architected for scale with CI/CD pipelines.

ReactNext.jsNode.jsPostgreSQLGitHub ActionsDocuSign APIStripe
-24%
Bounce Rate
-20%
Bundle Size
Web+Mobile
Platforms

Beagle — Fintech Platform

Built the web platform first using React & Next.js, then developed their internal company app with React Native & Flutter. Features pixel-perfect Figma implementations, a reusable design system, Firebase authentication, and push notification infrastructure.

ReactNext.jsReact NativeFlutterTailwindFirebaseFigmaRedux
80%
Test Coverage
50+hrs
Saved/Month
300+
Users

Legal Case Tracker — Investi

Full-stack web application for tracking legal cases with dynamic dashboards, automated data pipelines, and multi-tenant access control supporting 300+ concurrent users.

ReactNext.jsPythonREST APIsMongoDBJest
-38%
API Response
5
Depts Served
-30%
Fewer Bugs

Healthcare Analytics — Medtronic

Data-heavy analytics dashboard for healthcare teams featuring interactive D3.js visualizations, Python-powered APIs, and HIPAA-compliant user permissions with automated reporting.

ReactNext.jsD3.jsChart.jsPythonHIPAA
98
Lighthouse
2.1s
LCP
3x
Conv. Rate

ShopFlow — E-Commerce Platform

High-performance e-commerce storefront with dynamic product filtering, real-time inventory sync, Stripe checkout, and a headless CMS-powered admin panel. Optimized for Core Web Vitals and SEO with server-side rendering.

Next.jsTypeScriptStripePrismaPostgreSQLTailwindRedisVercel
5k+
Concurrent
99.7%
Uptime
4.8★
Rating

LearnPath — EdTech Platform

Interactive learning platform with live video classrooms via WebRTC, real-time collaborative whiteboards, progress tracking dashboards, and an AI-powered quiz generator. Supports 5,000+ concurrent students.

ReactNext.jsWebRTCSocket.ioNode.jsMongoDBAWSThree.js
10k+
Listings
3D Tours
Featured
-40%
Time to Lead

NestEstate — Real Estate App

Property listing platform with interactive 3D virtual tours powered by Three.js, map-based search with geolocation filters, mortgage calculators, and an agent scheduling system with real-time availability.

ReactNext.jsThree.jsMapboxNode.jsPostgreSQLFirebaseFramer Motion
500+
Vehicles
Real-time
GPS Tracking
-18%
Fuel Costs

TrackFleet — Logistics Dashboard

Real-time fleet management dashboard with live GPS tracking on interactive maps, route optimization algorithms, driver performance analytics, and automated delivery notifications with ETA predictions.

Vue 3Nuxt.jsD3.jsMapboxFastAPIWebSocketsDockerGCP
3
Ad Networks
1000+
Campaigns/Mo
-60%
Setup Time

AdLaunch — Campaign Creation Tool

Internal campaign management platform for a marketing agency, enabling teams to create, schedule, and optimize native ad campaigns at scale. Integrated with Taboola, Outbrain, and RevContent APIs for multi-network publishing, with real-time spend tracking, A/B testing workflows, bulk asset uploads, and automated performance reporting dashboards.

ReactNext.jsNode.jsTaboola APIOutbrain APIRevContent APIPostgreSQLRedisTypeScriptTailwind
Sub-50ms
Navigation
500+
Active Users
98
Lighthouse

Pulse CRM — Client Management

Lightweight CRM for freelancers and small agencies built with SvelteKit and server-side rendering. Features pipeline management with drag-and-drop Kanban boards, automated follow-up reminders, invoice generation, client communication timelines, and integrated email tracking.

SvelteKitSvelteTypeScriptPrismaPostgreSQLTailwindVercelResend API
10k+
Concurrent
Real-time
Analytics
< 200ms
Latency

StreamDeck — Live Event Dashboard

Real-time event monitoring dashboard built with Svelte and SvelteKit for a live streaming platform. Features WebSocket-driven viewer analytics, chat moderation tools, donation tracking with animated overlays, stream health monitoring, and multi-stream management from a single interface.

SvelteSvelteKitWebSocketsD3.jsNode.jsRedisDockerTypeScript

Get in Touch

Have a project in mind? Let's build something great together.

mju34170@gmail.com