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Senior AI Engineer (Backend-Focused) at Proxify. Location Information: Time zone: CET (+/- 3 hours). About us:. .  . . Talent has no borders. Proxify's mission is to connect top developers around the world with the opportunities they deserve. So, it doesn't matter where you are; we are here to help you fast-track your independent career in the right direction. 🙂. . Since our launch, Proxify's developers have successfully worked with 1200+ happy clients to build their products and growth features. 5000+ talented developers trust Proxify and its network to fulfill their dreams and objectives.. . Proxify is shaped by a global network of supportive, talented developers interested in remote full-time jobs. Our Glassdoor (4.5/5) and Trustpilot (4.8/5) ratings reflect the trust developers place in us and our commitment to our members' success.. .  . . The Role:. .  . . We are looking for a . Senior AI Engineer.  to join one of our high-growth client teams to lead the development of next-generation autonomous systems. This is a . backend-heavy fullstack role.  where you will be responsible for more than just simple prompt engineering. You will be architecting . Agentic Workflows. —systems that can reason, use tools, and execute complex coding tasks autonomously.. .  . . The ideal candidate is a language-agnostic engineer who is obsessed with the . Claude.  ecosystem and has hands-on experience building systems where AI agents interact with real-world data and codebases. You will bridge the gap between advanced LLM capabilities and robust, scalable backend production environments.. .  . .  . . What we are looking for:. .  . . . Deep expertise in Agentic Development. You should be comfortable building multi-agent systems, ReAct loops, and self-correcting workflows.. . Mastery of the Claude 3/3.5 family. You understand how to leverage Claude’s high reasoning capabilities and long context windows for complex logic.. . Experience building "AI-coding" features—using LLMs to generate, refactor, and test code programmatically within an application.. . Strong proficiency in at least one major backend language (Python, C#, or JavaScript/Node.js) and the ability to design the infrastructure (APIs, Webhooks, Databases) that supports AI agents.. . While backend-heavy, you are comfortable building the necessary frontend components (React/Vue) to allow users to interact with AI agents seamlessly.. . Extensive experience giving LLMs "tools"—designing clean API interfaces that agents can call to perform actions in the physical or digital world.. . Intermediate-advanced English level.. . Time zone: CET (+/- 3 hours). We are unable to consider applications from candidates in other time zones.. . .  . . Nice-to-Have:. .  . . . Experience with LangChain, LangGraph, or CrewAI.. . Knowledge of Vector Databases (Pinecone, Weaviate) and advanced RAG patterns.. . Familiarity with LLM Observability tools (LangSmith, Helicone) to debug agentic reasoning chains.. . Background in Software Engineering Fundamentals: You treat AI code like production code (CI/CD, Unit Testing, Version Control).. . .  . .  . . Responsibilities:. .  . . . Design and deploy autonomous agents that can handle end-to-end tasks, specifically focusing on Claude-based coding agents.. . Build the scalable "brains" of the application, ensuring that AI reasoning is integrated into the core business logic.. . Refine system prompts and multi-shot examples to maximize Claude’s reasoning performance.. . Implement guardrails and validation layers to ensure that agentic outputs are safe, predictable, and high-quality.. . Work with Product and UX teams to define how "AI Agents" should feel and behave within the product interface.. . .  . .  . . What we offer:. .  . . Get paid, not played. . No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options.. .  . . Predictable project hours. . Enjoy a harmonious work-life balance with consistent 8-hour working days with clients.. .  . . Flex days, so you can recharge. . Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify.. .  . . Career-accelerating positions at cutting-edge companies. . Discover exclusive long-term remote positions at the world's most exciting companies.. .  . . Hand-picked opportunities, just for you. . Skip the typical recruitment roadblocks and biases with personally matched positions.. .  . . One seamless process, multiple opportunities. . A one-time contracting process for endless opportunities, with no extra assessments.. .  . . Compensation. . Enjoy the same pay, every month with positions landed through Proxify.