AI developer jobs in the United States at Rex.zone focus on building production AI systems and LLM training workflows end to end, from data ingestion and feature pipelines to model training, RLHF, evaluation, and deployment.

Company: Rexzone

Role: AI Developer

Location: Remote, United States

Experience:

Mid-Senior experience building AI or ML-powered products in production environments

Key Skills:

AI development
Python
machine learning
deep learning
LLMs
NLP
computer vision
RLHF
prompt evaluation
model evaluation
MLOps
data pipelines
APIs
cloud deployment

Qualification:

Strong Python and software engineering fundamentals (APIs, testing, code reviews, CI/CD)
Hands-on experience with machine learning and deep learning concepts, and practical exposure to LLMs, NLP, or computer vision
Ability to design evaluation plans and interpret results to drive model performance improvement
Comfort working with data labeling processes, QA evaluation, and clear annotation guidelines compliance

Role Focus:

Design, build, and ship AI/ML features that connect training data to model behavior in production
Implement LLM application patterns (RAG, tool use, structured outputs)
Build evaluation harnesses
Collaborate on RLHF-style feedback loops to improve model performance and reliability
Partner with data operations to define labeling specs, QA evaluation standards, and annotation guidelines compliance for datasets used across NLP, computer vision, and content safety labeling
Build and maintain AI services (batch and real-time)
Integrate model inference APIs
Optimize latency and cost
Develop data pipelines for training and evaluation
Create automated evaluation for large language model evaluation, prompt evaluation, and safety regressions

Nice to have:

Experience with RLHF, preference modeling, prompt iteration, or human feedback loops
Familiarity with MLOps tools for deployment, monitoring, and experiment tracking
Experience implementing retrieval-augmented generation, vector search, and embedding pipelines
Background in content safety labeling, policy-aligned classification, or red-teaming evaluation
Experience collaborating with annotation vendors or BPO teams and defining scalable labeling and quality workflows

Other:

Salary Range: 63360 to 126720 USD per YEAR, depending on experience, scope, and interview performance
Compensation may include additional benefits per Rexzone policy and client engagement terms where applicable
Remote Type: Remote
Employment Type: FULL_TIME (primary)

AI Developer

Skills Required

Description