Senior AI Engineer

Senior AI Engineer

At 3Pillar, we leverage cutting-edge technologies to drive innovation and deliver impactful solutions for our clients. As a Senior AI Engineer, you will lead the design and implementation of scalable AI systems and provide technical mentorship to junior team members. You'll also evaluate model architectures, explore cutting-edge techniques, and ensure solutions are both impactful and ethical.

The Role

You will design, build, deploy and run AI agents that automate real business processes across Finance, Partners and Services, Support and beyond. You will take an agent from a messy process description to a governed, monitored, production system that people across the company use every day. You will work directly with our AI Architect and Build Lead. Claude is our primary AI interface, so the craft here sits behind the conversation: getting the right data, orchestrating reliable agent workflows, exposing them as tools, and running them safely in the cloud.

Key Responsibilities:

• Build production AI agents end to end: discovery with the process owner, design, prompt and tool engineering, testing, deployment and ongoing operation.
• Collaborate with stakeholders, including business owners, product managers, architects and software engineers, to identify business problems that can be solved with Gen AI and Agentic AI.
• Connect agents to company data through a Snowflake data foundation and directly to source systems such as NetSuite, Salesforce, Zendesk, Asana and PlanHat.
• Build and maintain MCP servers, tools and Claude skills so agents are available inside Claude where people already work.
• Design data and agent pipelines in Python: retrieval, structured extraction, multi-step orchestration, human-in-the-loop approvals and scheduled runs.
• Implement agent chaining so multiple agents collaborate to solve complex tasks.
• Develop and refine prompts to maximize the performance and accuracy of language models.
• Deploy and operate agents on AWS (Bedrock, Lambda, Step Functions or equivalent) with proper logging, monitoring, cost tracking and alerting.
• Write evaluations that prove an agent is accurate before go-live and keep it accurate afterwards.
• Apply security and data governance by design: least-privilege access, secrets management, PII handling and audit trails.
• Track token and infrastructure spend per agent so value can be reported net of cost.
• Maintain clear and comprehensive technical documentation, and share patterns so the rest of the company can reuse them.
• Mentor and provide technical guidance to junior Python engineers and team members.
• Advocate for AI adoption inside the team, inspiring and supporting others.

Minimum Qualifications:

• Bachelor's or Master's degree in Computer Science, Engineering, Mathematics or a related field.
• 4-7 years in software or data engineering, with at least 2 years focused on LLM and agent systems in production.
• A track record of building AI agents that run in production. You can walk us through agents you have shipped, the architecture behind them, what broke and how you fixed it.
• Deep working knowledge of agent design methods: tool use and function calling, planning and orchestration patterns, retrieval (RAG), memory and context management, guardrails, and human-in-the-loop design.
• Hands-on experience with LLM APIs (Anthropic Claude preferred; OpenAI or others welcome) and at least one agent framework or SDK such as Claude Agent SDK, LangGraph, LangChain or LlamaIndex, plus the judgment to know when a framework is not needed.
• Ability to work with different LLM models and choose one over another based on the use case.
• Strong Python, including building APIs (FastAPI), integrations and data pipelines.
• Strong SQL and experience working with a cloud data warehouse, ideally Snowflake.
• Experience deploying and operating services on AWS (or Azure), including serverless, containers, IAM, observability and CI/CD.
• Experience evaluating LLM systems: test sets, automated evals, regression testing of prompts and models.
• Builds software in an AI-driven way: AI coding agents, spec-first development, and human review at each stage.
• Understanding of data privacy, AI ethics, Responsible AI and model governance.
• Strong analytical and problem-solving skills, attention to detail, and the ability to work independently and with a team.
• Excellent communication skills, with the ability to present complex technical concepts to both technical and non-technical audiences.

Additional Experience Desired:

• Familiarity with AWS AIDLC or a similar AI-driven development methodology.
• Experience building MCP servers or Claude skills.
• AWS Bedrock in production.
• Snowflake Cortex, dbt or semantic layer modelling.
• TypeScript in addition to Python.
• Integration experience with NetSuite, Salesforce, Zendesk or similar business systems.
• Automating finance, operations or customer support processes.
• Working in regulated or data-sensitive industries such as legal, financial services or healthcare.
• Experience with vector databases (FAISS, Pinecone) and Hugging Face.
• Good understanding of software engineering processes, and experience working with large datasets in production.
• Contributions to research papers, blogs or open-source projects.

Benefits

• Vacations. According to the law from your first anniversary
• Discretionary Time Off (employees are able to take time off when necessary)*
• 26 days of Christmas bonus
• 75% vacation bonus
• Foo coupons
• Major Medical Insurance
• Life Insurance (optional)
• Savings Box (optional)
• Law benefits: IMSS, Afore, Infonavit
• Home office
• Udemy - E-learning

What is it like working for 3Pillar Global?

At 3Pillar, we offer a world of opportunity:

• Imagine a flexible work environment – whether it's the office, your home, or a blend of both. From interviews to onboarding, we embody a remote-first approach.
• You will be part of a global team, learning from top talent around the world and across cultures, speaking English everyday. Our global workforce enables our team to leverage global resources to accomplish our work in efficient and effective teams.
• We're big on your well-being – as a company, we spend a whole trimester in our annual cycle focused on wellbeing. Whether it is taking advantage of fitness offerings, mental health plans (country-dependent), or simply leveraging generous time off, we want all of our team members operating at their best.
• Our professional services model enables us to accelerate career growth and development opportunities - across projects, offerings, and industries.
• We are an equal opportunity employer. It goes without saying that we live by values like Intrinsic Dignity and Open Collaboration to create cutting-edge technology AND reinforce our commitment to diversity - globally and locally.

Join us and be a part of a global tech community! Check out our Linkedin site and Careers page to learn more about what it's like to be part of our #oneteam!

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