Senior Python Developer (AI-Assisted Development)

About the Position

We are seeking a Senior Python Developer with AI-Assisted Development expertise to join a startup building a web platform that helps engineers automate and standardize industrial instrument sizing and selection.

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 for 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 (e.g., Claude Code, Cursor) 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 (e.g., Claude Code, Cursor, Codex) 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.

We Offer

• Long-term and challenging projects.
• Interest in trending technologies and methodologies.
• Opportunity to initiate and take part in social projects.
• Transparency in relationships and workflows.

About the Company

What Defines Us

• Helping Each Other Grow: We support our colleagues in overcoming challenges and host internal educational events to boost our skills.
• Work and Life Sync: We love our jobs and are passionate about other things outside of work that make life exciting.
• Democratic Leadership: Every team member’s voice matters, regardless of role. We welcome your ideas and involvement in our company’s growth.
• Zero Bureaucracy: We strive to create a friendly and relaxed work environment. You can easily talk to C-level executives.

Perks of Working at Relevant

Organization

• Long-term and challenging projects.
• Interest in trending technologies and methodologies.
• Opportunity to initiate and take part in social projects.
• Transparency in relationships and workflows.

People

• Short distance to managers.
• Easy to get feedback.
• 53% male, 47% female.

Work

• Flexible working hours, plus the ability to work from home.
• Direct work with clients and direct impact on their projects.
• Possibility of business trips abroad.

Rewards

• 20 paid vacation days annually.
• 5 sick leaves.
• Reimbursement of sports activities.

Opportunities

• Ability to switch projects, technology stacks, and roles.
• Share and gain knowledge with regular tech talks.

What’s More?

• Referral program.
• Personal accountant.
• IT Club membership.