Python Fastapi Developer Jobs in Streamwood, IL (NOW HIRING)

Job#: 3032385
Job Description:
Apex Systems is seeking multiple Full Stack Engineers to help support our client's AI practice!
Summary
We are seeking a hands-on Full Stack Engineer to design, build, and deliver production-grade platform services for an AI-native enterprise system.
This role sits at the intersection of frontend engineering, backend services, and agentic AI platforms, supporting AI agents and orchestration workflows (LangGraph). You will work across the full stack-owning APIs, data layers, and user interfaces-while ensuring scalable, secure, and observable systems in a cloud-native environment.
This is a 100% hands-on role, focused on building and operating production systems end-to-end.
Key Responsibilities
Full Stack Development

• Design and build modern frontend applications using React or Angular (TypeScript, component-driven architecture, state management)
• Develop backend services and APIs using Python (FastAPI preferred) or similar frameworks
• Implement secure, scalable REST APIs and real-time communication (WebSockets / streaming)
• Ensure clean separation of concerns across frontend, API, and data layers

Agentic AI Platform Integration

• Build backend services that act as tools and APIs for AI agent workflows
• Design APIs that provide structured, deterministic data to LLM-based orchestration layers
• Support Human-in-the-Loop (HITL) workflows, including approval flows, callbacks, and state management
• Integrate with tool-calling frameworks and external AI orchestration systems
• Enable observability of agent workflows through structured logging, tracing, and correlation IDs

Backend & API Engineering

• Develop layered backend architectures using FastAPI, dependency injection, and clear interface boundaries
• Implement asynchronous data access patterns and high-performance APIs
• Define and enforce API contracts, validation models (e.g., Pydantic), and error handling standards
• Implement authentication and authorization using JWT, OAuth, IAM

Frontend Engineering

• Build responsive, accessible UI components
• Implement state management (Redux Toolkit, Zustand, NgRx, etc.)
• Integrate APIs, handle authentication flows, and ensure performance optimization
• Write unit and integration tests (Jest, React Testing Library, or Angular equivalents)

Cloud-Native Development

• Build and deploy services on Google Cloud Platform (preferred), AWS, or Azure
• Implement event-driven architectures (Pub/Sub, messaging systems)
• Work with managed services for compute, storage, and data processing
• Ensure secure configuration, secret management, and scalable deployments

Data Layer & Integration

• Design and implement data access across:
  • Relational databases (PostgreSQL / AlloyDB)
  • Graph database (Spanner)
  • NoSQL stores (Firestore or equivalent)
  • Caching layers (Redis)
  • Analytical systems (BigQuery or equivalent)
• Integrate with enterprise systems (e.g., SAP, Microsoft Graph, internal APIs)
• Build resilient integrations with retry, timeout, and fault handling patterns

Testing & Quality Engineering

• Write comprehensive unit and integration tests (pytest, pytest-asyncio, Jest)
• Cover edge cases, failure scenarios, and asynchronous workflows
• Follow best practices for code quality, observability, and maintainability

Required Skills & Experience

• 8+ years of experience in full stack software engineering
• Strong frontend experience with React or Angular (TypeScript)
• Solid backend development experience with Python (FastAPI, Flask, or Django)
• Experience building and deploying production-grade APIs and microservices
• Experience with agentic AI concepts (e.g., LangGraph, LangChain, tool-calling workflows)
• Strong understanding of REST APIs, async programming, and distributed systems
• Experience with relational databases and graph databses
• Hands-on experience with at least one major cloud provider (Google Cloud Platform preferred)
• Strong testing practices across frontend and backend
• Experience with Git-based workflows and code reviews

Preferred Qualifications

• Hands-on experience with LangGraph or similar agent orchestration frameworks
• Experience with Human-in-the-Loop (HITL) workflow patterns
• Familiarity with Model Context Protocol (MCP) or tool integration patterns
• Experience with real-time systems (WebSockets, streaming architectures)
• Strong experience with Google Cloud Platform services (Firestore, Pub/Sub, BigQuery, Cloud Run)
• Knowledge of distributed caching and concurrency patterns (Redis)
• Experience integrating with enterprise identity systems (Azure AD / MSAL)

Scope & Expectations

• 100% hands-on engineering role (no people management)
• Collaborate closely with AI/ML engineers on agent workflows and integrations
• Participate actively in design discussions, code reviews, and architecture decisions
• Deliver production-quality, scalable, and maintainable systems

Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.
Everforth Apex uses a virtual recruiter as part of the application process. Click for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at
Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Everforth Apex team member can provide.
Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.
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