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Lemon.io

Senior AI Engineer Architect

Full-time Europe Only Engineering & Tech Senior

Salary: Competitive, based on experience
Posted August 26, 2026
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About the Role

Lemon.io is seeking a highly skilled Senior AI Engineer/Architect to join our elite community of developers and architects. As a member of our marketplace, you will be matched with hand-picked startups in the United States and Europe, allowing you to focus entirely on building cutting-edge technology without the burden of client acquisition or rate negotiations. We prioritize autonomy and professional growth, offering a remote-first environment where your seniority is respected and your contributions directly impact the success of fast-paced, technical organizations.

In this role, you will lead the design and implementation of sophisticated AI solutions, ranging from large language model integrations to complex multi-agent orchestrations. Our ideal candidate is not just a coder, but a visionary architect capable of building robust projects from the ground up. You will work directly with technical founders and CTOs, providing the architectural guidance and engineering excellence required to turn ambitious AI concepts into scalable realities while enjoying a flexible schedule that respects your work-life balance.

Key Responsibilities

As a Senior AI Architect within the Lemon.io network, your daily activities will vary depending on the specific startup project, but generally include:

  • Designing and deploying end-to-end AI application architectures from scratch, ensuring scalability, security, and performance.
  • Implementing advanced RAG (Retrieval-Augmented Generation) pipelines and integrating high-performance vector databases like Pinecone or Weaviate.
  • Architecting multi-agent systems and AI agent orchestration frameworks to automate complex business workflows.
  • Developing and optimizing integrations with LLMs, including OpenAI, Claude, and various open-source vLLMs.
  • Collaborating directly with technical stakeholders to translate business requirements into technical roadmaps and architectural decisions.
  • Setting up AI telemetry and monitoring systems to ensure the reliability and efficiency of deployed models and agents.
  • Leading the automation of workflows using tools like Make.com, n8n, or Zapier, and integrating them with custom AI APIs.
  • Maintaining high standards of code quality and technical documentation while working independently in an asynchronous, remote environment.
Qualifications

We are looking for seasoned professionals who meet the requirements for one or more of our specialized AI tracks:

  • General AI Engineering: At least 3 years of commercial experience applying AI to practical solutions. Mastery of Python is required, along with 2+ years of mandatory experience in LangChain, RAG, and LLMs.
  • AI Agent Architecture: 3+ years of experience with Python and LLMs, with specific expertise in multi-agent systems architecture and AI telemetry.
  • AI Automation: Proficiency in workflow automation (Webhooks, SQL) and familiarity with AI API integrations and platforms like n8n or Zapier.
  • Technical Depth: A deep understanding of application architecture and the ability to initiate and lead projects from the initial concept to production.
  • Communication: Advanced English proficiency with the ability to justify architectural decisions and present technical concepts to clients clearly.
  • Self-Management: Strong organizational skills and the reliability required to deliver results consistently without direct supervision.
  • Adaptability: The flexibility to onboard quickly into fast-paced startup environments and start delivering value immediately.
Benefits

Working through Lemon.io offers a unique blend of stability and freedom tailored for senior engineers:

  • Competitive Compensation: We offer attractive rates based on your seniority and have already paid out over $11M to our community members.
  • Client Matching: No more hunting for work; we manually find the best projects that align with your specific skill set and preferences.
  • Zero Micromanagement: We respect your expertise; there are no screen trackers or invasive monitoring tools used in our partnerships.
  • Global Community: Connect with top-tier developers from over 75 countries and grow your professional network.
  • Seamless Support: Receive dedicated support from our team from the application stage through the entire lifecycle of your project cooperation.
  • Flexible Scheduling: Enjoy a schedule that works for you, with options for asynchronous communication and minimal overlap requirements.
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Required Skills

Python LLM LangChain RAG Vector Databases Multi-agent Systems Pinecone Weaviate AI Agent Orchestration n8n API Integration
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