Senior Ai Engineer (Backend-Focused)

Proxify connects top developers worldwide with remote full-time opportunities, supporting their independent careers. They have a strong reputation and a large network of talented developers.

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.

Requirements

• 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.

Benefits

• Enjoy on-time monthly payments with flexible withdrawal options.
• Enjoy a harmonious work-life balance with consistent 8-hour working days with clients.
• Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify.
• Discover exclusive long-term remote positions at the world's most exciting companies.
• Skip the typical recruitment roadblocks and biases with personally matched positions.
• A one-time contracting process for endless opportunities, with no extra assessments.
• Enjoy the same pay, every month with positions landed through Proxify.