We are looking for an analytical, automation-driven, and technically versatile professional who thrives at the intersection of AI systems, workflow automation, and customer operations. The AI Automation Engineer combines deep technical expertise in LLM-powered agents and REST API integration with a clear understanding of customer service workflows — building intelligent systems that transform how support operates at scale. The ideal candidate moves fluidly between designing a multi-agent architecture, building an N8N automation workflow, iterating on an LLM prompt, and integrating elements like API calls in data pipelines — all while keeping the end-user experience and operational excellence at heart. They take full ownership of projects, document as they go, and know how to unblock themselves. MAIN RESPONSIBILITIES: AI Agent & Automation Development Design and build multi-agent AI systems integrating LLMs for end-to-end customer-facing workflows: email triage, refund processing, escalation logic, voice bot interactions. Develop and maintain N8N automation workflows. Mid knowledge of python and javascript are required for code node scripting. Integrate voice AI platforms (e.g. Retell AI, ElevenLabs, ConnexAI, Vapi, BlindAI, etc.) with custom prompt logic for call bot behaviour, customer handling, and multi-step flows. Classify and prioritize automation use cases based on business impact, technical complexity, and urgency. Ensure every automated workflow reflects high-quality communication standards, SLA adherence, tone consistency, and operational resilience. API Integration & Technical Analysis Define, document, and test REST APIs for integration with CRMs, helpdesk platforms (Freshdesk), and internal systems across multiple product versions. Perform initial technical assessments of integration issues by reviewing API responses, logs, configurations, and system outputs to detect errors or inconsistencies. Build and manage comprehensive API test suites in Postman and N8N, covering edge cases and structured regression scenarios. Collaborate with Development, Product, and QA teams to reproduce, diagnose, and escalate complex technical issues efficiently and with complete context. Participate in regular syncs with technical leads to identify recurring automation gaps and drive process improvements. LLM Prompt Engineering & Structured Outputs Craft and iterate on LLM prompts for structured output generation — including JSON schema enforcement, multi-category classification, sentiment analysis, and application reference extraction. Debug and improve AI pipeline outputs, addressing inconsistencies in model responses. Apply knowledge of AI delegation and orchestration patterns to design reliable, scalable agent workflows. Process & Knowledge Improvement Identify recurring workflow gaps or automation opportunities and propose preventive or optimisation actions. Contribute to internal technical documentation, API specs, runbooks, and workflow guides to improve team efficiency and knowledge sharing. Support onboarding and upskilling of new team members on automation tools, AI systems, and integration patterns. Collaborate with cross-functional teams on initiatives that enhance the customer experience and streamline operational workflows. Requirements Education & Experience Minimum 2 years of experience in AI automation engineering, backend integration, or technical roles in digital or SaaS environments. Proven experience building and maintaining automation workflows in N8N or equivalent platforms (Zapier, Make, etc.). Hands-on experience working with REST APIs — design, integration, testing, and documentation. Building APIs is a plus. Nice to have: Background in Customer Service or Support operations is a plus, providing valuable context for automation design. Technical Knowledge Deep understanding of REST API design principles — HTTP semantics (GET, POST, PUT, PATCH), status codes, request/response structuring, and versioning. Proficiency with N8N: webhook debugging, dynamic base URL configuration and AI node integration. Experience with ZenDesk, HelpScout, Freshdesk or LiveAgent CRM platforms, and customer support tooling for API integration. Strong expertise in prompt engineering and Generative AI (LLMs), including developer-level experience with Claude (Sonnet, Opus), GPT, and similar models. Proficiency with Postman for API testing, test suite management, and environment configuration. Familiarity with voice AI platforms such as Vapi, Bland AI, ElevenLabs, ConnexAI, Retell AI or equivalent for call AI Agent development. Solid understanding of JSON data structures, API response parsing, and structured output validation. Working knowledge of JavaScript and Python. Nice to have: Familiarity with multi-agent orchestration frameworks (LangGraph, CrewAI, AutoGen) or academic interest in AI delegation patterns. Skills Strong analytical and problem-solving abilities, with a structured, detail-oriented approach to debugging automation pipelines and integration issues. Excellent written and verbal communication skills in English (advanced level, interviews will be made in full English); Spanish is a plus but not mandatory. Proven ability to work autonomously while maintaining close collaboration with cross-functional teams — technical leads, product managers, and support operations. Organised, accountable, and adaptable — able to manage multiple parallel automation projects effectively in a fast-paced environment. Curious and self-driven, with a genuine interest in pushing the boundaries of what AI systems can automate. Benefits WHY JOIN US Be part of a team that bridges customer operations with cutting-edge AI technology, building systems that have real, measurable impact on the business. Work in a collaborative, innovation-driven environment that values continuous learning, technical ownership, and creative problem-solving. Gain hands-on experience with state-of-the-art AI agents, LLM integrations, voice bots, and automation infrastructure at scale. Operate at the forefront of applied AI — where your work ships to production and directly shapes the customer experience. Growth and career development At Leadtech, we prioritize your growth. Enjoy a flexible career path with personalized internal training and an annual budget for external learning opportunities. Work-Life balance Flexible start and end times and the option of working full remote or from our Barcelona office. Enjoy free Friday afternoons with a 7-hour workday, plus a 35-hour workweek in July and August so you can savor summer! Comprehensive benefits Competitive salary, full-time permanent contract, and top-tier private health insurance (including dental and psychological services). 25 days of vacation plus your birthday off, with flexible vacation options—no blackout days! Unique Perks If you wish to come, in our office in Barcelona you’ll find it complete with free coffee, fresh fruit, snacks, a game room, and a rooftop terrace with stunning Mediterranean views. Additional benefits include ticket restaurant and nursery vouchers, paid directly from your gross salary. Join us in an environment where you’re free to innovate, learn, and grow alongside passionate professionals. At Leadtech, you’ll tackle exciting challenges and be part of a vibrant team dedicated to delivering exceptional user experiences Equal Employment Opportunity Employer Leadtech is an Equal Employment Opportunity (EEO) Employer, which means we encourage applications from people with different backgrounds, interests, and personal circumstances. Our team welcomes applicants regardless of their race, gender, age, religion, nationality, sexual orientation, and/or disabilities. All we need is your high energy, skills, and willingness to be part of a great project! Location You'll have the flexibility to choose whether you'd like to come to the office every day, from time to time, or work fully remote. We want you to find the best combination for you. If you prefer to be surrounded with amazing people, our exceptional office is in Barcelona's Blue Building, located right on the city's seafront. Besides our stunning views, you'll enjoy our office perks such as free fruit, snacks, and coffee and you'll also be able to take part in our Mario Kart and table tennis competitions. The personal data you provide will be used to manage your candidacy for the corporate selection processes that fit your profile. If you wish, you can exercise your rights of access, rectification or cancellation by sending a letter to Avenida Litoral, 12-14, 5ta planta, Barcelona 08005, or emailing us at [email protected], including a document that validates your identity.

AI Automation Engineer

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