Experience Timeline

A complete view of my professional path, focused on technical impact, product work, and technologies applied in real teams.

ACTIVE_WORK_LOG 01/06
Quartux
[ACTIVE_WORK_LOG]|remote

Quartux

Software Engineer

February 2025 - February 2026|Company site|remote

➜Serverless APIs, energy analytics, and real-time data optimization.

Built Cloudflare Workers and TypeScript services for energy data processing, using PostgreSQL, Kysely, ETL, Zod, caching, and React PDF reports for consumption, demand, costs, and savings.

  • Development of serverless APIs using Cloudflare Workers, focused on processing energy data and calculating consumption, demand, and savings indicators in real-time
  • Design and implementation of advanced SQL queries (PostgreSQL) for time-series analysis, including logic based on window functions (LAG, PARTITION BY) to calculate energy deltas (kWh) from cumulative data
  • Migration of complex queries to Kysely (TypeScript), ensuring exact parity with native SQL, handling CTEs (WITH), analytical functions, and preventing errors due to aliasing and typing
  • Construction of decoupled services such as operation-energy and cost-energy, applying clean architecture principles, layer separation (domain, application, infrastructure), and high cohesion
  • Implementation of business logic for calculating complex energy costs, including CFE rates, charges for capacity, distribution, and energy (base, intermediate, peak), as well as savings simulations with BESS systems
Cloudflare WorkersTypeScriptPostgreSQLKyselyReact PDFZodETL
Altomobile
[QUEUE_LOG_02]|remote

Altomobile

Front End Web Developer

August 2024 - February 2025|Company site|remote

React interfaces for multi-user experiences with audio and device control.

Built Figma-based UI components with React and Material UI, integrating MediaDevices for audio/video and improving quality through QA, GitLab CI/CD, ESLint, and manual testing.

  • Development of interactive web interfaces for real-time experiences (VSGs), focused on multi-user sessions with audio and device control
  • Implementation of UI components from Figma designs, ensuring visual consistency and attention to detail
  • Development of custom components in React for complex functionalities such as device selection and volume control
ReactMaterial UIFigmaMediaDevicesGitLab CI/CDESLint
DD360
[QUEUE_LOG_03]|remote

DD360

Front End Web Developer

March 2022 - April 2024|Company site|remote

React/Next.js applications, microfrontends, and scalable frontend systems.

Shipped SPA and SSR features with React, Next.js, and TypeScript, creating reusable components, TurboRepo microfrontends, REST/OpenAI integrations, Three.js experiences, Storybook, and performance improvements.

  • Development of SPA and SSR web applications with React and Next.js
  • Layout of responsive interfaces with HTML, CSS, and JavaScript
  • Implementation of microfrontends with TurboRepo for modularity and scalability
ReactNext.jsTypeScriptMicrofrontendsTurboRepoOpenAIStorybook
Rocket Code
[QUEUE_LOG_04]|remote

Rocket Code

Full Stack Engineer

June 2021 - July 2022|Company site|remote

Web/mobile apps with TypeScript, GraphQL, NestJS, and React Native.

Implemented React frontend, React Native/Expo mobile apps, and Node.js/NestJS backend services, designing GraphQL APIs, Apollo Client flows, MySQL models, and microservice architecture.

  • Development of full-stack applications using TypeScript, including web frontend (React) and mobile (React Native + Expo), as well as a backend based on Node.js.
  • Design and implementation of microservices architecture using NestJS, structuring scalable and maintainable services for business logic.
  • Construction of GraphQL APIs and consumption via Apollo Client, optimizing communication between multiple clients (web and mobile).
TypeScriptReactReact NativeExpoNode.jsNestJSGraphQL
TulkiPay
[QUEUE_LOG_05]|remote

TulkiPay

Front End Mobile Developer

August 2019 - January 2021|Company site|remote

Cross-platform fintech app with Flutter, Dart, and clean architecture.

Developed iOS/Android mobile UI with Flutter, integrating REST APIs, Dio, Provider, secure storage, biometric authentication, QR/camera features, and critical transaction flows.

  • Development of multi-platform fintech mobile applications using Flutter (Dart), focused on secure transactions, high performance, and user experience (UX).
  • Implementation of scalable layer-based architecture (Clean Architecture) separating presentation, domain, and data layers, facilitating product maintainability and growth.
  • Reactive state management using Provider and patterns derived from ChangeNotifier, ensuring data consistency in critical flows such as authentication and transactions.
FlutterDartREST APIsDioProviderSecure StorageBiometrics
LeonidasEsteban.com
[QUEUE_LOG_06]|remote

LeonidasEsteban.com

Front End Web Developer

January 2020 - July 2020|Company site|remote

Education platform with React, Next.js, SSR, authentication, and payments.

Built reusable UI with React, Next.js, Redux Saga, and Material UI, integrating Google OAuth, JWT/cookies, Stripe, Firebase, YouTube API, and Mailchimp for dynamic content.

  • Development of an online education platform with React and Next.js, implementing Server Side Rendering (SSR) to improve SEO and performance
  • Construction of a scalable frontend architecture using Redux + Redux Saga for global state and side effects management in SSR environments
  • Implementation of authentication with Google OAuth, session management with JWT and cookies, and route protection (HOC)
ReactNext.jsRedux SagaStripeFirebaseOAuthMaterial UI
Jasan Hernández

PROFILE_REFERENCE

Jasan Hernández

Puebla, Mexico · Software Engineer

LinkedInGitHubView CV / PDFDownload PDF

Years building

+6

Companies

06

Current focus

Product systems

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