Senior Python Developer (AI-Assisted Development), short-term cooperation

We are looking for a Senior Python Engineer with frontend expertise and hands-on experience in AI-assisted development approaches to join a startup building a web platform that helps engineers automate and standardize industrial instrument sizing and selection.

You will join a small team delivering the product’s initial release, focused on a deterministic calculation engine with transparent, explainable results and exportable engineering documents.

This is initially a full-time, short-term collaboration lasting up to 1.5 months, with the possibility of extension.

Responsibilities

• Lead design and implementation of backend services that power a deterministic engineering calculation and rules engine for industrial instrument sizing;
• Own system design decisions: APIs, data models, integrations, performance, and reliability;
• Build and evolve integrations with hosting and third-party services, plus decision traces, approval workflows, revision control, and PDF/XLSX document generation;
• Ensure code quality through clean architecture, testing, and code reviews;
• Optimize backend services for performance, security, and maintainability;
• Take technical ownership and drive engineering decisions within the team;
• Work with sensitive data to ensure correctness, consistency, and compliance;
• Leverage AI tools (Claude Code, Cursor, etc.) to accelerate development, debugging, and refactoring;
• Review, validate, and refine AI-generated outputs to ensure correctness, quality, and maintainability;
• Use AI to support system design, estimation, and technical decision-making.

Requirements

• 6+ years of professional software development experience;
• Strong backend expertise in Python (FastAPI);
• Experience working with Python data-processing libraries and calculation-heavy, rules-based applications;
• 2+ years of hands-on experience using AI development tools (Claude Code, Cursor, Codex, or similar) as a core part of the daily engineering workflow;
• Strong system design skills and understanding of distributed systems;
• Experience designing and implementing RESTful APIs, incorporating contract testing, backward compatibility, and resilience patterns (rate limits, retries, circuit breakers);
• Experience working with PostgreSQL (data modeling, versioning, audit trails, and data integrity controls);
• Experience working with Docker, managed cloud hosting (e.g., Heroku), automated testing, and deployment;
• Practical experience with React and TypeScript;
• Strong ownership mindset and ability to work independently;
• Upper-Intermediate or higher English level.

Nice to have

• Experience with event-driven architectures and message brokers;
• Experience working with industrial automation, process instrumentation, or engineering (EPC) products.
• Experience mentoring engineers in AI-assisted development practices.