Andrés Elias Ajras
Verified Expert in Engineering
AI Engineer and Developer
Buenos Aires, Argentina
Toptal member since October 7, 2026
Andrés is an AI engineer with 7 years of experience building and scaling production AI/ML systems in AdTech and programmatic advertising. He's a published researcher in Bayesian statistics and uncertainty quantification, with a background in mechanical engineering. He specializes in custom AI product development, LLM applications, machine learning, and data-driven solutions. He takes AI products from concept to production, building scalable systems that deliver business results.
Portfolio
Experience
- Python - 7 years
- Amazon Web Services (AWS) - 7 years
- Machine Learning - 6 years
- Bayesian Statistics - 6 years
- Relational Databases - 6 years
- RAG Pipelines - 2 years
- LangChain - 2 years
- LLM Agents - 2 years
Preferred Environment
Python, PostgreSQL, LangGraph, Amazon Web Services (AWS)
The most amazing...
...solution I've built is an LLM and knowledge-graph AI engine that cut undetected ad fraud from 30% to under 3%.
Work Experience
Senior AI Engineer
EBSCO
- Led a team of 5 engineers building programmatic advertising infrastructure under OpenRTB 2.x across multiple DSP integrations, processing 5-10 billion requests per day at a 99.9% availability SLA.
- Owned system architecture, database schema design, PR review, sprint planning, and stakeholder reporting.
- Architected a centralized billing and analytics platform in PostgreSQL, automating data ingestion, contract workflows, and commission calculations.
Researcher at the Laboratory of Applied Mechanics
Facultad de Ingeniera - UNComa
- Awarded a competitive research grant to develop computational routines based on the Finite Element Method and Bayesian statistical algorithms.
- Published five peer-reviewed papers in IEEE, Springer, and ASME venues.
- Ran large-scale simulations on AWS cluster infrastructure for data-driven modeling and uncertainty quantification.
Experience
Auction Reserve Pricing Engine
Ad Account Fraud Screening Engine
Education
Master’s Degree in Data Science and Artificial Intelligence
University of Buenos Aires - Argentina
Degree in Mechanical Engineering
National University of Comahue - Argentina
Certifications
C2 English Proficiency
Cambridge Assessment
Skills
Libraries/APIs
React, Beautiful Soup, Playwright, Pandas, Claude API, Node.js, API Development, REST APIs, TensorFlow, Stripe, HLS.js
Tools
Claude Code, Codex, Claude, Git, Helm, NGINX, PlayReady
Languages
Python, JavaScript, TypeScript, ECMAScript (ES6), HTML5, Rust, BrightScript
Frameworks
Selenium, Agentic Frameworks, Next.js, LangGraph, NestJS, Jest, LightningJS
Paradigms
Continuous Delivery (CD), Continuous Integration (CI), REST, Testing
Platforms
Amazon Web Services (AWS), Docker, Google Cloud Platform (GCP), Vercel, Harness, SharePoint, Replit, Databricks, Azure, Kubernetes, tvOS
Storage
Relational Databases, PostgreSQL, MySQL, Redis
Other
LLM Agents, Machine Learning, FastAPI, Bayesian Statistics, Full-stack, Artificial Intelligence (AI), Large Language Models (LLMs), AI Engineering, Agentic AI, Agentic RAG Systems, RAG Architecture, Cloud Platforms, AI Integration, AI Tools, AI-assisted Development, GitHub Actions, Web Scraping, Full-stack Development, Cloudflare, Supabase, Architecture, Software Architecture, Telemetry, Real-time Data, Smart TV, Video Streaming, Roku, Widevine, Technical Leadership, API Integration, Recommendation Systems, Natural Language Processing (NLP), Prompt Engineering, Vector Search, Pgvector, RAG Pipelines, LangChain, Vector Databases, Data Build Tool (dbt), Internet of Things (IoT), MPEG-DASH, Web Applications, Video Players, Search Engines, English
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