Posted May 21, 2026
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. - 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
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. - Organized, 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
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, our office in Barcelona is 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
Leadtech is an Equal Employment Opportunity (EEO) Employer, meaning we encourage applications from people with diverse backgrounds, interests, and personal circumstances. All we need is your high energy, skills, and willingness to be part of a great project!
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