Fractional Senior Full Stack Engineer – Stabilization, AI-Generated Code

bullpen talent

Senior engineer reviewing and stabilizing AI-generated codebases for various products. Collaborating across projects and addressing structural issues in existing systems.

Posted 4/30/2026contractRemote • 🇪🇺 Anywhere in EuropeSeniorWebsite

About the role

Key responsibilities & impact

Review and assess existing codebases (often AI-generated or founder-built)
Identify bugs, structural issues, and technical risks
Refactor and stabilize applications for production use
Improve performance, structure, and maintainability
Fill gaps in core functionality (auth, payments, backend logic)
Implement lightweight QA / testing where needed
Collaborate with engineers, QA, and project leads
Work across multiple projects as priorities shift

Requirements

What you’ll need

5+ years of full stack experience
Strong experience working in messy / inherited codebases
Comfortable operating without full documentation
Proven ability to take products from MVP → stable product
Practical, solution-oriented mindset (not theoretical)
Strong communication and team collaboration
Comfortable in fast-moving, delivery-focused environments

Benefits

Comp & perks

Flexible work arrangements
Professional development opportunities

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

full stack developmentcode reviewbug identificationcode refactoringapplication stabilizationperformance improvementbackend logicQA testingMVP to stable product transitionmessy codebase management

Soft Skills

solution-oriented mindsetstrong communicationteam collaborationadaptabilityproblem-solvingorganizational skillsinterpersonal skillsability to work under pressureflexibilityproactive mindset