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OutSystems Logo OutSystems · IT - Software Development

Principal Software Engineer (Fullstack)

Portugal; United Kingdom · Job Posted February 20, 2026
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Job Description

As a Principal Software Engineer in OutSystems R&D, you’ll help shape the experience of the next generation of AI driven developer capabilities that are offered by our Platform, building delightful, powerful, and high-performance tools that make modern application development faster and more enjoyable. In this role, you’ll collaborate closely with architects, PMs, designers and fellow engineers to deliver features end-to-end — from technical design and implementation to performance optimization and usability. You’ll tackle complex engineering challenges around user experience, scalability, collaboration, and developer productivity, while ensuring that our users can trust the quality and reliability of the tools they rely on daily.

Job Responsibility

  • Drive the solution design, implementation, and maintenance of robust, delightful, scalable, and secure core features for our developers building apps on OutSystems
  • Collaborate with product managers, UX designers, and other engineers to deliver solutions that balance functionality, usability, scalability, and high degree of automation
  • Own features end-to-end: from architecture and technical design to alignments, coding, testing, deployment, and monitoring in production
  • Drive engineering excellence by promoting clean code practices, automated testing, performance optimization, and continuous delivery
  • Mentor and support other engineers, fostering knowledge sharing and a culture of innovation
  • Stay up to date with emerging technologies and bring forward ideas to continuously improve our engineering

Requirements

  • Proven experience (10+ years) as a software engineer solving complex problems, and building high-impact products or platforms
  • Strong skills in TypeScript/JavaScript and modern web development frameworks (e.g., React, Angular, or similar)
  • Strong skills in C# (.NET Core)
  • Solid understanding of software architecture, design patterns, and scalability principles
  • Experience with cloud-native development (e.g., microservices, containers, CI/CD pipelines, monitoring, distributed systems)
  • Familiarity with building developer tools, IDEs, or productivity software is a strong plus
  • Knowledge of performance optimization, debugging complex issues, and ensuring product reliability at scale
  • Excellent collaboration skills, with the ability to work across product, design, and engineering teams
  • Passion for delivering outstanding developer experiences and helping others build great software
  • Good communication skills and fluency in English

Nice to have

Familiarity with building developer tools, IDEs, or productivity software

What we offer

  • A company that is always growing, changing, and innovating
  • Real career opportunities
  • Work colleagues that are as smart, hard-working, and driven as you
  • Disrupting the status quo is in our DNA
  • We ask “why” a lot
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