About ControlShift AI ControlShift AI (CSAI) is building the AI-powered full-funnel growth platform for service-based small and medium businesses (SMBs). From attracting new leads to converting them into customers—and supporting them post-sale—we enable SMBs to automate and scale their entire customer journey without without increasing headcount. Our platform combines: Intelligent Voice & Chat Agents for sales, support, and operations AI-driven content generation and publishing to increase visibility Smart lead capture and qualification workflows Automated appointment booking and follow-ups Seamless integration with the tools SMBs already use Whether you're a healthcare , real estate agent, tutor, coach, or startup , ControlShift AI helps you turn traffic into conversations, conversations into leads, and leads into booked customers— autonomously . We're a fast-growing early-stage startup based in Sydney, Australia, and we’re passionate about giving SMBs access to the kind of automation and AI power previously reserved for large enterprises. Our mission is simple but bold: 👉 Put intelligent, scalable automation in the hands of every small business. Role Overview We’re looking for a FastAPI Developer (Freelance) with experience in AI/ML model integration to help us develop and maintain backend systems that power our intelligent agent platform. You'll play a hands-on role in building scalable APIs and integrating AI-driven features, collaborating with a lean, motivated team. Responsibilities Design and maintain RESTful APIs using FastAPI(Mandatory) Integrate AI/ML models from OpenAI, Claude, HuggingFace, and others into backend workflows Write clean, testable, and efficient code using modern Python best practices Optimize performance for speed and scalability Collaborate remotely with cross-functional teams on product features Troubleshoot, debug, and deploy solutions using Docker and CI/CD pipelines Qualifications 3+ years of Python backend development Strong skills in FastAPI , Pydantic , and asyncio Proficient in OOP and software engineering principles Experience integrating LLMs , vector databases, or AI APIs Familiarity with Docker , cloud deployment (AWS, Azure, etc.), and CI/CD workflows Bonus: experience with LangChain , RAG pipelines , voice agents or AI Agent frameworks Self-motivated and comfortable working in a fully remote environment Bachelor’s degree in Computer Science or equivalent practical experience Why Work With Us? Join a fast-moving AI startup shaping automation for SMBs Work directly with the founder and influence tech decisions Flexible, remote-first work culture Opportunity to transition into long-term or equity-based role Solve real-world problems with real impact How to Apply Send your CV, GitHub profile, and a short note about your most interesting AI integration project to: hr@controlshiftai.com Or apply directly via LinkedIn .