Senior AI Engineer (Backend-Focused)

ProxifyProxify·Remote(Time zone: CET (+/- 3 hours))
Software Development
Programmatic

WFA Digital Insight

The demand for skilled AI engineers continues to soar, with experts predicting a 25% increase in AI adoption by 2027. As companies seek to harness the power of autonomous systems, professionals with expertise in agentic development, Claude ecosystem, and backend languages are in high demand. With its commitment to connecting top talent with cutting-edge companies, Proxify stands out in the remote job market. Before applying, candidates should be prepared to showcase their technical expertise and experience in building complex AI systems.

Job Description

About the Role

As a Senior AI Engineer at Proxify, you'll be part of a high-growth client team, leading the development of next-generation autonomous systems. This is a backend-heavy full-stack role where you'll be responsible for architecting Agentic Workflows, systems that can reason, use tools, and execute complex coding tasks autonomously. Your expertise will bridge the gap between advanced LLM capabilities and robust, scalable backend production environments.

About Proxify

Proxify is a platform that connects top developers around the world with the opportunities they deserve. With a global network of supportive and talented developers, Proxify has established itself as a trusted partner for remote full-time jobs. Our clients have successfully worked with over 1200 happy clients to build their products and growth features, and we have a 4.5/5 rating on Glassdoor and 4.8/5 on Trustpilot.

What You Will Do

  • 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
  • Develop and maintain the necessary frontend components to allow users to interact with AI agents seamlessly
  • Design clean API interfaces that agents can call to perform actions in the physical or digital world
  • Contribute to the development of the company's AI strategy and vision
  • Participate in code reviews and contribute to the improvement of the overall code quality

What We Are Looking For

  • Deep expertise in Agentic Development
  • Experience building multi-agent systems, ReAct loops, and self-correcting workflows
  • Mastery of the Claude 3/3.5 family
  • Strong proficiency in at least one major backend language (Python, C#, or JavaScript/Node.js)
  • Ability to design the infrastructure (APIs, Webhooks, Databases) that supports AI agents
  • Experience building 'AI-coding' features—using LLMs to generate, refactor, and test code programmatically within an application
  • Intermediate-advanced English level
  • Experience working in a remote team and managing 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)

Benefits and Perks

  • Get paid on time with flexible withdrawal options
  • Enjoy a harmonious work-life balance with consistent 8-hour working days
  • Take advantage of up to 24 flex days off per year without losing pay
  • Discover exclusive long-term remote positions at cutting-edge companies
  • Enjoy the support of a global network of talented developers
  • Access to the latest tools and technologies
  • Opportunities for career growth and professional development

How to Stand Out

  • Make sure to highlight your experience with Claude ecosystem and Agentic Development in your resume and cover letter
  • Be prepared to showcase your proficiency in at least one major backend language and your ability to design infrastructure that supports AI agents
  • Emphasize your ability to work in a remote team and manage time zones effectively
  • Show your passion for AI engineering and autonomous systems, and explain how you stay up-to-date with the latest developments in the field
  • Consider creating a portfolio that showcases your experience in building complex AI systems and your ability to design and deploy autonomous agents
  • Prepare to back up your claims with specific examples and case studies
  • Research the company culture and values to ensure you're a good fit for the role and the company

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