Principal Full Stack Software Engineer - AI-First Development (538)

Job Description

Principal Full Stack Engineer – AI First Development

Remote – LATAM / Full-time / Remote

Info on the Principal Full Stack Engineer – AI First Development role

Ready to take the next step in your international career? We can support you!

Ubiminds is a GPTW-certified, people-first company that partners with American software product companies to scale their global teams. We connect top LATAM talent with international product companies while providing full employer-of-record support and long-term career development.

In this opportunity, you will join a product engineering team building a next-generation cloud-native SaaS platform from the ground up. You'll work alongside architects, product managers, designers, and engineers to deliver scalable, secure, and high-performance software while embracing AI-first development practices that accelerate delivery and improve engineering quality.

Challenge

We are looking for a Principal Full Stack Engineer who combines deep technical expertise with hands-on software development and technical leadership.

This is a highly impactful role where you'll own features end-to-end, define architecture, mentor engineers, and establish engineering best practices across the organization.

You'll help shape modern, AI-assisted software development workflows, leveraging tools like GitHub Copilot, Cursor, and Claude Code to deliver production-ready solutions in a fast-paced, shift-left engineering environment.

Responsibilities:

• Design, develop, and deliver scalable SaaS applications using .NET, Angular, SQL Server/PostgreSQL, and AWS.
• Own end-to-end delivery, from domain modeling and backend services to frontend implementation, testing, deployment, and production support.
• Leverage AI-assisted development tools to generate production-ready code and accelerate engineering workflows.
• Collaborate with Architects to define application architecture and validate technical approaches through proof-of-concepts (PoCs).
• Design solutions using modern architectural patterns including Domain-Driven Design (DDD), CQRS, Event-Driven Architecture, Backend-for-Frontend (BFF), and API Gateway.
• Develop modern Angular applications using standalone components, Signals, RxJS, and Reactive Forms.
• Design efficient data models and optimize database performance for scalable applications.
• Troubleshoot complex production issues, perform root cause analysis, and improve system reliability.
• Mentor engineers through technical leadership, architecture discussions, code reviews, and knowledge sharing.
• Promote engineering excellence through automation, AI-enabled workflows, and continuous improvement.

Mandatory Skills:

• 10+ years of professional software engineering experience.
• Experience as a Principal Engineer, Lead Engineer, or equivalent technical leadership role.
• Expert proficiency in C#, .NET, Entity Framework, Angular, and SQL Server/PostgreSQL.
• Strong experience with DDD, CQRS, REST APIs, Event-Driven Architecture, and distributed systems.
• Experience designing secure, scalable, multi-tenant SaaS applications.
• Strong knowledge of SQL optimization, data modeling, Redis, and OpenSearch/Elasticsearch.
• Experience with automated testing, CI/CD, Git, Agile methodologies, and modern DevOps practices.
• Experience with observability and monitoring tools, as well as static analysis tools such as SonarQube and Mend.
• Hands-on experience using GitHub Copilot, Cursor, Claude Code, or similar AI coding assistants.
• Strong communication, mentoring, collaboration, and problem-solving skills.
• Bachelor's degree in Computer Science, Engineering, or equivalent professional experience.
• Advanced English communication skills.

Nice to Have:

• Experience with AWS services such as ECS/Fargate, Lambda, SQS/SNS, S3, and RDS.
• Experience with Terraform or AWS CDK.
• Knowledge of GraphQL, WebSockets, or Server-Sent Events (SSE).
• Experience with Playwright or SmartBear TestComplete.
• Experience using Datadog, CloudWatch, or New Relic.
• Experience building AI-enabled applications using LLMs, RAG, or Model Context Protocol (MCP).

Team & Environment:

• Product-focused engineering organization building a next-generation SaaS platform.
• Highly collaborative environment involving Architects, Product Managers, UX Designers, and Engineers.
• Strong engineering culture centered on technical excellence, ownership, and mentorship.
• AI-first development practices integrated into the software development lifecycle.
• Opportunity to influence architecture, engineering standards, and modern development practices.
• High-autonomy role with significant technical impact.

About Ubiminds

Our Culture

People First. We are all about people!

Challenge yourself. There’s always room for improvement and continuous improvement is in our essence.

Make it happen. Be ready to take challenges as they come. It’s all about attitude and commitment.

We’re in this together. We work as a team, thrive as a team, and evolve as a team.

Averaging on awesome. We work hard to deliver high-quality services and look forward to exceeding expectations.

Keep it real. We promise you honesty, transparency, and openness, regardless of the situation.

Perks and Benefits

As a Principal Full Stack Engineer @Ubiminds, you:

• Are placed in a product-based company, with the same treatment as their full-time employees.
• Have our full back-office support, from career guidance to HR and concierge services.
• Enjoy our remote-first policy.
• Get your own MacBook.
• Have access to growth opportunities through tech talks, chapter meetings, and remote happy hours.
• Improve your English through free lessons with native English speakers.
• Participate in our Candidate Referral Program.
• Optionally use our Florianópolis office with snacks, games, and weekly massages.

How our process works

1. Interview with Tech Recruiter (chat about the role and your experience)
2. Client process (may vary)
3. Offer 🎉

AI Disclaimer

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.