Senior Python Developer

Senior Python Developer

Location:

Fenton, MO, United States

Job Type: Full-Time

Department:
Business Services

Arch Key is one of the nation's largest privately held specialty trade installation and integrated facility service companies. We are a leader in designing, building and maintaining electrical, technologies and specialty systems. We’re the power behind making the improbable possible. We’re electrifying the nation, energizing the future and bringing communities to life like never before. What we do today shapes the vision of tomorrow.

Our work impacts lives long after the building is done. We are committed to building in ways that are not just technologically advanced, but sustainable, scalable and equitable for all. We’re not just energizing infrastructure; we’re energizing careers, communities and the future.

The Senior Python Developer is responsible for designing, developing, and maintaining complex, scalable Python applications and systems. The role provides technical leadership, mentors development team members, and drives architectural decisions that support business operations and innovation. The Senior Python Developer ensures all solutions align with company policies, procedures, objectives, and regulations.

• Designs, develops, and maintains Python applications
• Is a Full Life Cycle Python Developer
• Provides technical and design leadership

• Designs, develops, and maintains scalable Python applications, APIs, and microservices using best practices and modern design patterns.
• Establishes and maintains enterprise-level Python development standards and enforces coding conventions.
• Provides architectural leadership, guiding system design and technology selection.
• Translates Business Requirements Documentation (BRD) into technical specifications and solution designs.
• Provides accurate level-of-effort estimates and contributes to project planning and roadmap discussions.
• Drives successful project delivery on time and within budget while maintaining high-quality standards.
• Writes clean, efficient, well-documented, and maintainable code.
• Conducts thorough code reviews to ensure quality, performance, security, and adherence to standards.
• Designs and implements RESTful APIs with appropriate authentication, versioning, validation, and error handling.
• Implements automated testing strategies, including unit, integration, and end-to-end tests.
• Builds and maintains CI/CD pipelines to support reliable and efficient deployments.
• Optimizes application performance and troubleshoots complex production issues.
• Ensures adherence to security best practices, data protection regulations, and secure coding standards.
• Collaborates with cross-functional teams to deliver effective technical solutions.
• Mentors and supports developers to strengthen team capabilities and technical excellence.
• Promotes continuous improvement in development processes, tools, and team practices.
• Contributes to documentation, knowledge sharing, and technical best practices across the organization.
• Consistently makes decisions in an attentive and safe manner to ensure the safety and health of self and others.
• Utilizes LEAN concepts or other continuous improvement methodologies to ensure the most efficient operations, processes, and activities.
• Promotes and models the Company mission, vision and values through exercising sound and ethical business practices, championing all elements of diversity, equity, and inclusion (DEI) and providing high quality services and programs as they relate to clients, subcontractors, co-workers, suppliers, and the public.

• Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or a related field; or equivalent professional experience.
• 5–7 years of professional software development experience.
• 3+ years of hands‑on Python development experience in production environments.
• Proven experience designing and implementing RESTful APIs and microservices architectures.
• Experience working in Agile environments (Scrum or Kanban).
• Expert‑level proficiency in Python 3.x, including deep knowledge of language features, best practices,…