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Senior Software Engineer, Full Stack (.NET, React)

Upstart 13.com

Hybrid

Fully Remote

Full Time

Calling All Upstarters!

Senior Full Stack Engineer Wanted!

We are Upstart 13. We are humble, hungry, and competent people who are radically changing the expectations and experience of outsourcing for all participants by challenging barriers that create inequality and by bringing down borders in technology for people everywhere. We’re all about delivering value and doing big things. We have become a game changer for teams around the world who look to Upstart’s services as a differentiator.

Job Description:

We are seeking a highly skilled and experienced Senior Software Engineer located in Latam with .NET and React expertise to join our dynamic team in a rapidly growing technology environment. As a Senior Software Engineer, you will be responsible for implementing, and maintaining scalable software solutions. 

Responsibilities:

  • Work as a part of an agile development team, taking responsibility for organizing and planning their own work.
  • Implement, improve, and maintain backend services.Build, improve, and maintain responsive frontend applications.
  • Collaborate with system/feature stakeholders to discuss, collect, interpret, and analyze technical constraints and establish technical solutions.
  • Building reusable components and front-end libraries for future use.
  • Help to build Backend APIs and perform peer code reviews.
  • Work with the Technical Lead Engineer on designing services/micro-frontends/solutions, planning, and reviews of the team.
  • Analyze unfamiliar code of a reasonable complexity to understand, extend and refactor it.

Qualifications

Technical Skills:

  • 5+ years of experience in software development. 
  • Thorough understanding of React.js and its core principles.
  • Strong proficiency in TypeScript and JavaScript, including DOM manipulation.
  • Experience with common front-end development tools such as NPM.
  • In-depth knowledge of CSS and HTML.
  • Experience in building and maintaining applications using C#, .NET Core, and its features.
  • Experience with SQL Databases. 
  • Experience in developing highly available and scalable backend services.
  • Solid experience in Git.Experience and understanding of the best practices for writing unit tests.

Soft Skills:

  • Problem-solving: Capacity to evaluate complex systems and craft innovative solutions.
  • Adaptability: Openness to exploring emerging technologies and best practices.
  • Team-oriented: Collaborative approach to working with diverse stakeholders.

Bonus Skills:

  • Familiarity with secure coding principles.
  • Familiarity with HIPAA technical safeguards.

Why Upstart13?

  • We put people first at Upstart 13! We believe the world is filled with amazing people and we are willing to go to great lengths to seek out others who share our values to join our cause of bringing down borders in technology for people everywhere.
  • We develop leaders at Upstart 13, we focus on what matters to do meaningful work, we own our shit, we stay curious, and we understand responsibility leads to giving. We do big things together!

Perks:

  •  20+ Paid time off days.
  • Job-type: long-term, full-time job.
  • Fully remote.
  • USD competitive salary.

Are you ready to join our cause? Be sure to ask, “why 13?

Senior Software Engineer, Full Stack (.NET, React)

Hybrid

Fully Remote

Full Time

September 18, 2025

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Upstart 13

upstart13inc