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Manuel Martínez-Arraya

Manuel Martínez-Arraya

LLM Personalization Engineer (SendMage)

Argentina flagBuenos Aires, Argentina
$20.00/hrExpertOtherAws Sagemaker

Key Skills

Software

Other
AWS SageMakerAWS SageMaker

Top Subject Matter

Outbound sales/personalized marketing AI
Software Engineering
Regulatory Compliance & Risk Analysis

Top Data Types

TextText
DocumentDocument

Top Task Types

Text GenerationText Generation

Freelancer Overview

LLM Personalization Engineer (SendMage). Brings 13+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Internal and Proprietary Tooling. Education includes Bachelor of Business Administration, UADE (2016) and No Formal Degree, Platanus Ventures (2023). AI-training focus includes data types such as Text and labeling workflows including Text Generation.

ExpertEnglishSpanish

Labeling Experience

LLM Personalization Engineer (SendMage)

TextText Generation
As sole engineer at SendMage, created and maintained LLM-driven personalization pipelines for outbound sales messaging. Developed prompt orchestration, quality-control layers, and content generation using OpenAI and Anthropic APIs. Oversaw AI output quality and brand alignment through systemic prompt and output curation. • Built and tuned prompts to generate per-contact customized outreach. • Evaluated and iterated on responses for adherence to brand and campaign goals. • Maintained high deliverability and low manual intervention through LLM workflows. • Used proprietary and external APIs for ongoing text generation improvements.

As sole engineer at SendMage, created and maintained LLM-driven personalization pipelines for outbound sales messaging. Developed prompt orchestration, quality-control layers, and content generation using OpenAI and Anthropic APIs. Oversaw AI output quality and brand alignment through systemic prompt and output curation. • Built and tuned prompts to generate per-contact customized outreach. • Evaluated and iterated on responses for adherence to brand and campaign goals. • Maintained high deliverability and low manual intervention through LLM workflows. • Used proprietary and external APIs for ongoing text generation improvements.

2023 - 2025

Education

P

Platanus Ventures

No Formal Degree, Entrepreneurship

No Formal Degree
2023 - 2023
U

UADE

Bachelor of Business Administration, Business Administration and Computer Sciences

Bachelor of Business Administration
2012 - 2016

Work History

S

Stealth Startup

Co-Founder

Buenos Aires
2026 - Present
S

SendMage

Co-Founder & Engineer

Buenos Aires
2023 - 2025