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Zacharie P.

Zacharie P.

AI Training & Data Annotation · Senior

United States · Rate on request

Professional Overview

I specialize in AI/LLM evaluation and coding-agent benchmarking, backed by 20+ years of production software engineering. Across Mercor, Snorkel AI, Aligneer, Handshake, Outlier, Turing, and Shift, my work includes evaluation harnesses, reference solutions, regression tests, grading rubrics, RLHF preference annotation, and multimodal data annotation. I build repository-based coding tasks with Docker environments and automated verifiers, then analyze agent trajectories for correctness, regressions, reward hacking, and answer leakage. In a Java coding-agent evaluation, I diagnosed API and state-integrity failures, refined task instructions, and independently verified the corrected implementation with 24 passing tests. My technical background includes Java, Python, SQL, TypeScript, React, AWS, and CI/CD, with production systems supporting 5M+ monthly requests and 99.9% uptime. I bring practical engineering judgment to model evaluation, benchmark design, and AI training data quality.

Experience

Company
Snorkel AI, Aligneer, Handshake, Outlier, Turing, Shift
Jan 2026 – Oct 2026
Role title
Coding-Agent Evaluation and SWE Benchmark Engineer

AI Expertise

AI Training & Data Annotation AI Safety & Governance

Skills

Model Evaluation RLHF AI Agents Claude Data Annotation Docker TypeScript Computer Vision

Employment Type

Contract

Description of Responsibilities

  • Build Snorkel AI Harbor tasks with golden patches and held-out tests
  • Write golden solutions and regression tests from real GitHub PRs for Handshake
  • Score Aligneer coding-agent trajectories on 7 quality dimensions in Claude Code
  • Write Turing red-team prompts to break Gemini, Claude, and Qwen on reasoning
  • Annotate robot-learning video for Shift with contact boundaries at ±5 frames

Key Achievements / KPIs

  • Shipped 5 Snorkel tasks: oracle passed 3/3 runs, no-op agent scored 0 on each
  • Grew graded tests on a Snorkel task from 13 to 34
  • Built two tasks where Claude Opus 4.8 and Codex GPT-5.5 both scored 0/8
  • Wrote 35-55 item grading rubrics for Handshake tasks without LLM help
Company
Mercor
Aug 2025 – Oct 2026
Role title
AI/LLM Evaluation and Coding-Agent Benchmark Engineer

AI Expertise

AI Training & Data Annotation NLP & Prompt Engineering

Skills

Model Evaluation RLHF Prompt Engineering AI Agents Claude Data Annotation Excel A/B Testing

Employment Type

Contract

Description of Responsibilities

  • Grade Claude Code output on Java/DDD refactoring tasks with hidden rubrics, gold
  • Rank up to 6 AI-generated spreadsheets, slide decks, and documents per task agai
  • Write coding prompts calibrated to 0-40% and 40-70% AI pass-rate bands for vibe-
  • Produce RLHF preference labels from paired model outputs for a phased frontier-m
  • Audit an AI agent’s Excel analysis of recruiting data for scoring anomalies, dup

Key Achievements / KPIs

  • Raised a Claude Code run from 20 to 24 passing tests by tracing two defects to p
  • Ranked AI deliverables across 52 tasks: 29 spreadsheet tasks and 23 slide-deck t
  • Passed the Mercor Spreadsheet Proficiency exam 12/12, proctored, with AI tools p
  • Completed 11 separate Mercor engagements since 2025 across grading, ranking, RLH
Company
PAX Technology
Mar 2024 – Nov 2025
Role title
Senior Software Engineer

AI Expertise

MLOps & AI Infrastructure Data Engineering & Big Data

Skills

Kafka AWS Docker Kubernetes CI/CD TypeScript Node.js Claude

Employment Type

Full-time

Description of Responsibilities

  • Built fleet services for remote updates on thousands of IoT payment terminals
  • Wrote C++ and Java code for low-latency TCP/IP links to terminal firmware
  • Designed Kafka pipelines for terminal telemetry and deployment orchestration
  • Provisioned AWS, Azure, and GCP with Terraform, mainly AWS Lambda and Aurora
  • Integrated Angular frontends with Node.js/Express services and MongoDB

Key Achievements / KPIs

  • Cut deployment time 60% with Jenkins and GitLab CI/CD, enabling daily releases
  • Kept 99.9% uptime on IoT device services with tuned PostgreSQL and Flyway
  • Cut incident triage time with Prometheus, Loki, and Grafana fleet dashboards
  • Added SonarQube, Black Duck, and Fortify security scans to CI/CD pipelines

Education

School
Kennesaw State University
Sep 2004 – Jun 2007
Degree / Program
Master of Science (M.S.) in Computer Science

Field of Study: Machine Learning and Pattern Recognition

School
University of Yaoundé I
Oct 1991 – Jun 1992
Degree / Program
Master of Science (M.S.) in Computer Science

Field of Study: Operations Research and Linear Programming (Simplex Method)

School
University of Yaoundé I (Cameroon)
Oct 1988 – Jun 1991
Degree / Program
Bachelor of Science (B.S.) in Mathematics

Field of Study: Mathematics with Computer Science

Areas of Expertise

NLP & Prompt Engineering

Build natural language processing systems, fine-tune large language models, and craft reliable production prompts for AI-powered products.

MLOps & AI Infrastructure

Architect scalable ML infrastructure — CI/CD for ML, model versioning, experiment tracking, monitoring, and cloud deployment on AWS, GCP, or Azure.

Automation & AI Workflows

Build intelligent automation pipelines, integrate AI APIs into existing tools, and replace manual workflows with agentic AI systems.

Open to

Contract Freelance Full-time Contract-to-hire Part-time

Skills

model evaluation rlhf data annotation Prompt Engineering ai agents Python Docker claude SQL CI/CD

Experience Level

Senior

Current location

United States

Time Zone

New York UTC-5

Primary Work Language

English

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