Fractional Senior Developer

The company is an early-stage engineering firm building procurement software for the construction industry. It has live products, active customers, and revenue. We are hiring a hands-on senior engineer / fractional CTO-type to replace an outgoing technical lead. This is a part-time, fractional role (approximately 15–25 hours/week) that will inherit and stabilize the existing codebase, support ongoing maintenance, and build new AI-enabled product features. Target start is within a few weeks with a brief overlap with the current technical lead.

Responsibilities

• Rapidly onboard and take ownership of the existing codebase and infrastructure
• Triage, prioritize, and fix production bugs and reliability issues
• Design, implement, and deploy new product features (especially AI-enabled features)
• Build and maintain AI/LLM workflows, including OCR pipelines and model inference infrastructure
• Develop and run backend model testing and accuracy/validation frameworks
• Maintain and evolve cloud-hosted infrastructure, CI/CD, and relational database operations
• Collaborate closely with a small cross-functional team; participate in product planning and technical decisions
• Create and improve documentation, runbooks, and knowledge transfer materials
• Coordinate a short transition period with the outgoing technical lead and accept occasional advisory support thereafter

Qualifications

• Senior, hands-on engineering experience with a track record of owning production systems
• Strong backend development experience (Python preferred) and solid knowledge of relational data modeling
• Proven experience with cloud infrastructure, deployments, and CI/CD best practices
• Practical experience building AI/LLM integrations, OCR workflows, and production model pipelines
• Experience implementing model testing, accuracy validation, and monitoring for ML systems
• Comfortable balancing maintenance/operational work with new feature development in a small team
• Experience shipping B2B/enterprise SaaS products; construction-industry experience is a plus
• Able to commit about 15–25 hours/week and available to start within a few weeks; prior fractional engagement experience preferred
• Effective independent worker and communicator in lean engineering teams; regional presence optional