Senior Full Stack Engineer (Python, FastAPI, AI-Assisted Development)

Job Type: Full-Time, Remote
Working Hours: U.S. Client Business Hours (with flexibility for sprint reviews, deployments, and production support)

About the Role

At Pavago, one of our clients is hiring a Senior Full Stack Engineer to architect and build a modern tax filing platform from the ground up.

This isn’t just another software engineering role.

You’ll own the architecture, backend services, frontend experience, and technical decisions behind a mission-critical platform where security, accuracy, and reliability are essential.

You’ll work extensively with AI-assisted development tools such as Cursor and Claude Code to accelerate development while maintaining exceptional code quality.

If you enjoy solving complex technical problems, building scalable systems, and taking ownership from architecture through deployment, this role is for you.

Key Responsibilities

Full-Stack Application Development

• Design, build, and maintain production-grade web applications.
• Develop secure backend services using Python and FastAPI.
• Build intuitive, responsive frontend interfaces for complex workflows.
• Design APIs and scalable service architectures.
• Integrate frontend and backend systems seamlessly.

System Architecture & Design

• Own end-to-end application architecture.
• Design scalable data models and service boundaries.
• Build systems designed for long-term maintainability.
• Drive technical decisions that improve scalability and reliability.
• Identify technical risks early and recommend practical solutions.

Backend Development

• Develop secure REST APIs using FastAPI.
• Build business logic for complex workflow-driven applications.
• Implement third-party integrations and external services.
• Optimize application performance and API responsiveness.
• Build reliable background processing workflows.

Frontend Development

• Develop user-friendly interfaces for forms, dashboards, and workflow management.
• Build responsive, well-structured UI components.
• Integrate frontend applications with backend APIs.
• Improve usability while maintaining performance and accessibility.

AI-Assisted Software Development

• Leverage Cursor and Claude Code throughout the development lifecycle.
• Build AI-assisted workflows that improve engineering productivity.
• Use AI to accelerate implementation, debugging, testing, and documentation.
• Continuously refine development workflows using emerging AI tools.

Testing, Quality & Reliability

• Write and maintain:
• Unit tests
• Integration tests
• End-to-end tests
• Maintain high code quality standards.
• Improve application stability and reliability.
• Refactor code where necessary to reduce technical debt.

Security & Data Integrity

• Implement robust validation and error handling.
• Ensure secure handling of sensitive user information.
• Follow security best practices for authentication, authorization, and input validation.
• Build systems where data accuracy and integrity are critical.

Documentation & Collaboration

• Document architecture decisions and implementation details.
• Collaborate with product, engineering, and stakeholders across time zones.
• Participate in sprint planning, technical discussions, and code reviews.
• Proactively communicate risks, blockers, and recommendations.

Requirements

Must-Have Qualifications

• 5+ years of professional Full Stack Software Engineering experience.
• Strong expertise in:
• Python
• FastAPI
• REST API development
• Experience designing and shipping production applications.
• Strong frontend development skills with modern JavaScript frameworks.
• Experience building workflow-driven or form-heavy applications.
• Hands-on experience using:
• Cursor
• Claude Code
• AI-assisted development tools
• Experience with:
• PostgreSQL or similar relational databases
• Git
• API integrations
• Strong written and verbal English communication skills.

Preferred Qualifications

• Experience in:
• FinTech
• Tax software
• Compliance platforms
• Financial systems
• Experience building highly secure applications.
• Familiarity with asynchronous collaboration in distributed engineering teams.
• Experience designing scalable system architecture.

What Makes You Successful

• You think like an owner, not just a contributor.
• You proactively solve problems without waiting for detailed specifications.
• You thrive in complex, detail-oriented environments.
• You communicate clearly and proactively.
• You embrace feedback and continuous improvement.
• You care deeply about code quality, scalability, and maintainability.

Typical Day

• Review overnight updates and sprint priorities.
• Build backend APIs and frontend features.
• Design and improve application architecture.
• Develop workflow logic and complex business rules.
• Use Cursor and Claude Code to accelerate development.
• Collaborate with product and engineering teams.
• Write tests and review pull requests.
• Document technical decisions and deployment updates.

In short: You’ll design, build, and continuously improve a scalable software platform while owning technical execution from architecture through production.

Key Performance Indicators (KPIs)

• High-quality features delivered on schedule.
• Secure, reliable, and scalable application performance.
• Low production error rates and technical debt.
• Strong automated test coverage.
• Well-documented, maintainable code.
• Positive collaboration across engineering and product teams.

Why Join Us?

• Architect and build a mission-critical platform from the ground up.
• High ownership with direct technical impact.
• Work with modern AI-assisted engineering workflows.
• Solve complex engineering challenges.
• Fully remote environment with flexible collaboration.
• Opportunity to grow into:
• Staff Engineer
• Technical Lead
• Engineering Manager
• Software Architect

Interview Process

1. Initial Phone Screen
2. Video Interview with Pavago Recruiter
3. Technical Assessment
4. Client Interview with Engineering Team
5. Offer & Background Verification

Apply Now

If you’re passionate about building scalable applications, leveraging AI to improve software development, and taking ownership of complex engineering challenges, we’d love to hear from you.