IntelliSavvy
IntelliSavvy

Full Stack Developer

July 25, 2025
Other
Remote · El Salvador
Entry level
Back-end Developer
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Job Title: Full Stack Developer

Location: Remote, El Salvador

Experience Required: 5–8 years

Note: Only candidates with advanced English proficiency (C1/C2) will be considered.

Job Summary

We are seeking a skilled and motivated Full Stack Developer to join our remote engineering team on a contract basis. This role is ideal for a developer with 5–8 years of hands-on experience in building robust web applications using .NET (Framework 4.8 / .NET 8) and modern front-end technologies such as JavaScript, TypeScript, HTML5, CSS3, and frameworks like Angular, React, or Vue.js. You will play a critical role in enhancing legacy systems and developing scalable, maintainable full-stack applications.

Key Responsibilities

  • Analyse, refactor, and modernize legacy applications built on .NET Framework 4.8
  • Design and develop scalable back-end services and APIs using ASP.NET MVC, .NET Core, and .NET 8
  • Build and maintain responsive, user-friendly front-end interfaces using Angular, React, or Vue.js
  • Work with core web technologies including JavaScript, TypeScript, HTML5, and CSS3
  • Collaborate across the full stack to ensure seamless integration between UI, services, and database layers
  • Decompose monolithic applications into modular, maintainable services
  • Optimize Visual Studio solution structure and streamline CI/CD pipelines
  • Write clean, testable, maintainable code with comprehensive unit, integration, and regression testing
  • Work closely with UX/UI, QA, and DevOps teams to ensure high-quality delivery
  • Apply engineering best practices including SOLID principles, DDD, and design patterns
  • Monitor application performance and reliability using tools like Application Insights, Datadog, or New Relic

Must-Have Skills

  • 5–8 years of full stack development experience, including:

  • .NET Framework 4.8, .NET 8, ASP.NET MVC, Web API, Entity Framework

  • Front-end frameworks: HTML, CSS and JavaScript

  • Strong proficiency in JavaScript, TypeScript, HTML5, CSS3

  • Proficient in SQL: stored procedures, performance tuning, indexing

  • Solid understanding of RESTful API development and integration

  • Familiarity with Git, CI/CD pipelines, and automated deployments

  • Hands-on experience with modernization and legacy system improvement

  • Knowledge of testing frameworks like xUnit, NUnit, or MSTest

  • Strong grasp of clean architecture and scalable code design