Lead Python Developer

We are looking for Lead Python Developer for our client in Seattle WA.

Job Title: Lead Python Developer

Job Location: Seattle WA

Job Type: Contract

Job Overview:

Pay Range: $45.00hr - $50.00hr

Requirement/Must Have:

• Minimum 5+ years of professional Python development experience delivering secure, scalable, and production-quality backend applications or calculation services.
• Strong proficiency in modern Python, object-oriented design, modular architecture, reusable libraries, type validation, dependency management, and coding standards such as PEP 8.
• Hands-on experience developing REST APIs using FastAPI or an approved equivalent framework, including request validation, API versioning, authentication, structured error responses, and OpenAPI documentation.
• Strong knowledge of SQL and PostgreSQL, including data modelling, queries, functions, indexing, transaction management, and performance optimization.
• Proven ability to identify opportunities for engineering automation and productivity improvements using AI, Generative AI, intelligent agents, scripting, and developer tooling.
• Experience with Pydantic, PyTest, importlib, caching, configuration management, and development of reusable Python utilities and packages.
• Experience translating complex formulas, business rules, dependency graphs, or scientific models into deterministic, traceable, and testable software components.
• Experience designing automated unit, integration, regression, and API tests, with disciplined defect analysis and test evidence.
• Experience with Microsoft Azure services, App Service or approved container platforms, Azure DevOps, continuous integration and deployment pipelines, secrets management, logging, monitoring, and application support.
• Strong understanding of secure software development, data protection, auditability, resilience, performance, and production support practices.

Responsibilities:

• Design, develop, enhance, and support modular Python services and REST APIs for the calculation engine.
• Translate validated building science formulas, rules, assumptions, and dependency flows into accurate, maintainable, and testable Python components.
• Develop and integrate calculation capabilities for energy, water, materials, embodied carbon, baseline standards, scenario simulation, explainability, anomaly management, and cost-related functions.
• Build reusable calculation libraries, data models, validation rules, configuration services, and version-controlled datasets using Python, FastAPI, Pydantic, SQL, and PostgreSQL.
• Integrate calculation services with the application through well-defined API contracts, structured inputs and outputs, secure authentication, and reliable error handling.
• Optimize calculation performance, database queries, caching, asynchronous processing, and service scalability for global usage and high-volume calculation scenarios.
• Create and maintain automated unit, integration, regression, and API tests using PyTest or approved equivalent frameworks.
• Maintain technical documentation, API specifications, calculation traceability, data dictionaries, setup guides, deployment notes, and support runbooks.
• Participate in solution design, code reviews, backlog refinement, sprint ceremonies, release planning, deployment, defect resolution, and post-deployment support.
• Implement production-grade logging, monitoring, auditability, exception handling, retries, configuration management, and operational support procedures.

Nice to Have:

• Working knowledge of building science, energy and water efficiency, materials, embodied carbon, cost calculations, or sustainability standards is preferred.

Skills:

• Python.
• FastAPI.
• SQL.
• PostgreSQL.
• Pydantic.
• PyTest.
• Microsoft Azure.
• Azure DevOps.
• REST APIs.
• Generative AI.
• Object-oriented design.
• PEP 8.

Qualification And Education:

• Strong verbal and written communication skills.
• Excellent communication and presentation skills.
• Ability to communicate effectively with stakeholders.

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• Medical, Dental, and Vision Insurance
• 401(k) Retirement Plan
• Health Savings Account (HSA)
• Disability Insurance (Short-Term and Long-Term)
• Life and AD&D Insurance
• Paid Sick Leave (where required by applicable state or local law)
• Supplemental Insurance Plans
• Identity Theft Protection
• Pet Insurance
• Employee Wellness Programs
• Employee Assistance Program (EAP)
• Career Growth and Professional Development Opportunities