Senior AI Engineer (Backend-Focused) - vaga remota

A empresa Proxify está com uma vaga aberta de Senior AI Engineer (Backend-Focused): nível senior, ou seja, a empresa espera que você tome as decisões. A posição fica na área de TI e programação e é totalmente remota. A empresa contrata candidatos que estejam na Europa.

As principais ferramentas citadas no anúncio são: React, Node.js, Python, .NET. O currículo precisa mostrar exemplos concretos exatamente dessas habilidades.

A empresa não publicou nenhum valor, isso é acertado na entrevista. O anúncio indica o fuso horário CET, então o horário de trabalho precisa ser combinado com o seu.

Esta vaga passou por uma verificação automática: anúncios que exigem autorização de trabalho estrangeira, patrocínio de visto, uma nacionalidade específica ou residência em um país indicado não entram na lista.

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.

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Hand-picked opportunities, just for you

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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.