Principal .NET Software Engineer - Remote - USA

About FullStack

FullStack is one of the fastest-growing software consultancy companies in the Americas. We deliver transformational digital solutions to top global companies and Silicon Valley startups. As an employee-first company, we focus on hiring the most talented software designers and developers by creating a positive, respectful, and supportive work environment where they can achieve their greatest potential.

• Offering life‑changing career opportunities to talented software professionals across the Americas.
• Building highly-skilled software development teams for hundreds of the world’s greatest companies.
• Having delivered hundreds of successful custom software solutions, which have positively impacted the lives and careers of millions of users.
• Our 4.2-star rating on GlassDoor.
• Our client Net Promoter Score of 68, twice the industry average.

We’re Most Proud Of

• Offering life‑changing career opportunities to talented software professionals across the Americas.
• Building highly-skilled software development teams for hundreds of the world’s greatest companies.
• Having delivered hundreds of successful custom software solutions, which have positively impacted the lives and careers of millions of users.
• Our 4.2-star rating on GlassDoor.
• Our client Net Promoter Score of 68, twice the industry average.

The Position

We’re looking to hire a Principal .NET Software Engineer to join our team. You’ll work with our incredible clients in one of two ways:

• Team Augmentation: You will integrate directly into our client’s team and work alongside their existing designers and engineers daily.
• Design & Build: You will work on a FullStack product team to build and deliver a product to our clients.

What We're Looking For

• 8+ years of professional software engineering experience.
• 3+ years of experience in technical leadership influencing architecture and engineering direction.
• Advanced English is required.
• Successful completion of a four-year college degree is required.
• Expert-level proficiency with C# and .NET framework.
• Hands‑on experience with TypeScript/JavaScript.
• Proven experience working with mobile‑first or progressive web app frameworks (React, Next.js, or similar).
• Strong experience building and scaling distributed systems in production.
• Proven experience with AWS.
• Solid experience with containerization tools such as Docker or Kubernetes.
• Deep knowledge of Infrastructure as Code (Terraform and Helm), CI/CD, and GitOps practices.
• Experience with SQL and NoSQL databases.
• Experience implementing event streaming solutions using Kafka or Kinesis.
• Strong understanding of microservices architecture and event‑driven systems.
• Experience implementing secure authentication and authorization using OAuth/OIDC.
• Experience designing and maintaining APIs and service‑to‑service integrations.
• Experience implementing observability practices using tools such as Datadog, Prometheus, CloudWatch, or distributed tracing solutions.
• Strong background in testing strategies including Test-Driven Development (TDD), integration testing, and performance testing.
• Ability to work through new and difficult issues and contribute to libraries as needed.
• Ability to create and maintain continuous integration and delivery of applications.
• Forensic attention to detail.
• A positive mindset and a can‑do attitude.
• Experience working on Agile/Scrum teams.
• Meaningful experience working on large, complex systems.
• Ability to take extreme ownership over your work. Every day is a challenge to ensure you are performing to the expectations you and your team have agreed upon.
• Ability to identify with the goals of FullStack’s clients and dedicate yourself to delivering on the commitments you and your team make to them.
• Ability to consistently work 40 hours per week.

Nice To Have

We’re seeking engineers who are AI‑enthusiastic in their workflow. Professional experience or personal project work with the following is a significant plus:

• Cursor, Windsurf, or Google Antigravity.
• Claude Code, Gemini CLI, Codex, or Copilot CLI.

What We Offer

• Competitive Salary.
• Paid Time Off (vacation, sick leave, maternity and paternity leave, holidays).
• 100% remote work.
• The ability to work with leading startups and Fortune 500 companies.
• Health, dental, and vision insurance.
• 401(k) w/ 4% match.
• Ample opportunity for career advancement.
• Continuing education opportunities.

FullStack is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status.

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