Senior Full Stack Engineer

Senior Full Stack Engineer (Python, FastAPI & AI-Assisted Development) – RemotePosition Type: Full-Time, Remote Working Hours: U.S. Client Business Hours (with flexibility for sprint reviews, deployments, and production support)About the RoleAt 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 key technical decisions behind a mission-critical platform where security, scalability, 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 and engineering standards.If you enjoy solving complex technical problems, building scalable software, and taking ownership from architecture through deployment, this role is a strong fit.What You’ll OwnFull-Stack Application DevelopmentDesign, build, and maintain production-grade web applications.Develop secure backend services using Python and FastAPI.Build intuitive, responsive frontend interfaces for complex workflows.Design scalable REST APIs and service architectures.Integrate frontend and backend systems seamlessly.Deliver maintainable, high-quality software across the full application stack.System Architecture & Technical DesignOwn end-to-end application architecture.Design scalable data models and service boundaries.Build systems designed for long-term maintainability and growth.Drive technical decisions that improve scalability, reliability, and performance.Identify technical risks early and recommend practical solutions.Backend DevelopmentDevelop secure REST APIs using FastAPI.Build business logic for workflow-driven applications.Integrate third-party APIs and external services.Optimize application performance and API responsiveness.Build reliable background jobs and asynchronous processing workflows.Frontend DevelopmentBuild responsive, user-friendly interfaces for dashboards, forms, and workflow management.Develop reusable UI components using modern JavaScript frameworks.Integrate frontend applications with backend APIs.Improve usability while maintaining accessibility and performance.AI-Assisted Software DevelopmentLeverage Cursor and Claude Code throughout the software development lifecycle.Build AI-assisted engineering workflows that improve developer productivity.Use AI tools to accelerate implementation, debugging, testing, refactoring, and documentation.Continuously improve engineering workflows using emerging AI technologies.Testing, Quality & ReliabilityWrite and maintain:Unit testsIntegration testsEnd-to-end testsMaintain high code quality standards.Improve platform reliability and application stability.Refactor code to reduce technical debt and improve maintainability.Security & Data IntegrityImplement robust validation, authentication, and authorization.Ensure secure handling of sensitive financial and user data.Follow security best practices throughout the application lifecycle.Build systems where data integrity and accuracy are critical.Documentation & CollaborationDocument architecture decisions, APIs, and technical implementations.Collaborate with product managers, engineers, and stakeholders across time zones.Participate in sprint planning, architecture discussions, and code reviews.Communicate blockers, risks, and technical recommendations proactively.What Success Looks LikeHigh-quality features delivered on schedule.Secure, reliable, and scalable application architecture.Strong automated test coverage and low production error rates.Maintainable, well-documented code.Effective collaboration across engineering and product teams.Continuous improvements to development workflows through AI-assisted tooling.What Makes You a Strong FitThink like an owner, not just a contributor.Proactively solve complex technical problems.Comfortable making architectural decisions.Strong attention to detail and software quality.Excellent communicator who collaborates effectively across teams.Passionate about scalable software, clean architecture, and continuous improvement.Excited to leverage AI tools to improve engineering productivity.Required Experience & SkillsExperience5+ years of professional Full Stack Software Engineering experience.Strong expertise with:PythonFastAPIREST API developmentExperience designing and shipping production-grade applications.Strong frontend development experience using modern JavaScript frameworks.Experience building workflow-driven or form-heavy applications.Hands-on experience using:CursorClaude CodeAI-assisted development toolsExperience with:PostgreSQL or similar relational databasesGitAPI integrationsExcellent written and verbal English communication skills.Nice to HaveExperience building:FinTech platformsTax softwareCompliance platformsFinancial systemsExperience developing highly secur