{"id":3845728,"url":"https://alion.io/job/cognizant-senior-python-developer-onsite","title":"Senior Python Developer (Onsite)","company":{"id":85,"name":"Cognizant","domain":"cognizant.com","url":"https://alion.io/company/cognizant","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Cognizant Careers","truth_index":{"grade":"A","score":87,"open_postings":188,"ghost_share":0.011,"stale_share":0.463,"repost_share":0.074,"time_to_fill_p50_days":23,"computed_at":"2026-11-07T05:47:08Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Washington, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Configuration Management","optional":false},{"name":"FastAPI","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Pydantic","optional":false},{"name":"Pytest","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"SQL","optional":false},{"name":"Agile","optional":true},{"name":"Azure","optional":true},{"name":"Azure DevOps","optional":true},{"name":"CI/CD","optional":true}],"status":"live","first_seen_at":"2026-11-05T15:10:16Z","employer_posted_date":"2026-11-06","last_verified_at":"2026-11-07T20:28:32Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"About the Role\nWe are seeking a Senior Python Developer to design, build, and support the modular services and REST APIs behind the EDGE V4 Calculation Engine. You will turn validated building science formulas, rules, and assumptions into accurate, maintainable, and testable Python components that serve global, high-volume use.\nKey Responsibilities\nCalculation Services and APIs\nDesign, develop, enhance, and support modular Python services and REST APIs for the EDGE V4 Calculation Engine.\nTranslate validated building science formulas, rules, assumptions, and dependency flows into accurate, maintainable, and testable Python components.\nDevelop and integrate calculation capabilities for energy, water, materials, embodied carbon, baseline standards, scenario simulation, explainability, anomaly management, and cost-related functions, as prioritized by the product backlog.\nArchitecture and Data\nBuild reusable calculation libraries, data models, validation rules, configuration services, and version-controlled datasets using Python, FastAPI, Pydantic, SQL, and PostgreSQL (or approved equivalent technologies).\nIntegrate calculation services with the EDGE V4 application through well-defined API contracts, structured inputs and outputs, secure authentication, and reliable error handling.\nOptimize calculation performance, database queries, caching, asynchronous processing, and service scalability.\nQuality and Testing\nCreate and maintain automated unit, integration, regression, and API tests using PyTest (or approved equivalent frameworks).\nSupport system integration testing and user acceptance testing.\nOperations and Documentation\nImplement production-grade logging, monitoring, auditability, exception handling, retries, configuration management, and operational support procedures.\nMaintain technical documentation, API specifications, calculation traceability, data dictionaries, setup guides, deployment notes, and support runbooks.\nTeam Collaboration\nParticipate in solution design, code reviews, backlog refinement, sprint ceremonies, release planning, deployment, defect resolution, and post-deployment support.\nRequired Qualifications\nMinimum 8 years of professional Python development experience delivering secure, scalable, production-quality backend applications or calculation services.\nStrong proficiency in modern Python, object-oriented design, modular architecture, reusable libraries, type validation, dependency management, and coding standards such as PEP 8.\nHands-on experience developing REST APIs with FastAPI (or an approved equivalent), including request validation, API versioning, authentication, structured error responses, and OpenAPI documentation.\nStrong knowledge of SQL and PostgreSQL, including data modeling, queries, functions, indexing, transaction management, and performance optimization.\nProven ability to identify opportunities for engineering automation and productivity gains using AI, Generative AI, intelligent agents, scripting, and developer tooling, with practical solutions that reduce manual effort, improve code quality, accelerate testing, and enhance team effectiveness.\nExperience with Pydantic, PyTest, importlib, caching, configuration management, and development of reusable Python utilities and packages.\nExperience translating complex formulas, business rules, dependency graphs, or scientific models into deterministic, traceable, and testable software components.\nPreferred Qualifications\nExperience designing automated unit, integration, regression, and API tests, with disciplined defect analysis and test evidence.\nExperience with Microsoft Azure services, App Service or approved container platforms, Azure DevOps, CI/CD pipelines, secrets management, logging, monitoring, and application support.\nStrong understanding of secure software development, data protection, auditability, resilience, performance, and production support practices.\nWorking knowledge of building science, energy and water efficiency, materials, embodied carbon, cost calculations, or sustainability standards.\nAbility to collaborate with product owners, architects, building science specialists, QA teams, UX teams, DevOps teams, and business stakeholders.\nExcellent analytical, documentation, communication, and problem-solving skills, with experience working in Agile and multicultural delivery teams across time zones.","description_format":"text","description_chars":4376,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Consulting & Digital Transformation","IT Outsourcing & Dedicated Teams","Engineering Services","Cloud Consulting & Migration"],"lifecycle":[{"event":"open","at":"2026-11-06T00:38:56Z"}],"visa":[{"country":"US","licensed_sponsor":true,"adverts_offering_sponsorship_24m":0,"sanctioned_now":false,"evidence":"H-1B filings in 12 months: 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