# Senior AI Engineer

**Company:** [Saga](https://hotfix.jobs/companies/saga)
**Location:** Remote
**Role:** ML Engineering
**Experience:** 5+ years
**Skills:** Python, Llm Fine-Tuning, RLHF, Prompt Engineering, Data Pipelines, Api Services, Go, Distributed Systems, Multi-Modal Ai, Reinforcement Learning
**Posted:** 2026-03-23

> Senior AI Engineer builds, trains, deploys, and operates character AI agents at scale, managing LLM/SLM pipelines, social platform integrations, and feedback loops. Requires 5+ years in backend/ML engineering with production AI deployment experience.

## Job Description

## The Work

- Build and maintain the training and inference pipelines for character AI agents, including LLM/SLM orchestration and swarm-based architectures
- Deploy and operate AI agents across social media platforms (Instagram, X, WhatsApp, TikTok) with consistent character behavior and personality coherence
- Develop tooling for studios and creators to customize agent personality, lore, brand guidelines, and behavioral guardrails
- Build and improve the feedback loops — fine-tuning, reward models, **RLHF**, and **RLAIF** — that keep agents improving over time
- Architect and scale the infrastructure supporting agent deployments, including multi-modal capabilities (text, voice, video, livestreaming)
- Contribute to the agentic commerce platform — enabling agents to drive transactions, recommend products, and interact with payment systems
- Implement safety and content moderation systems to ensure agents behave appropriately across diverse user interactions
- Collaborate with studio partners to translate creative direction into agent training parameters and behavioral specifications
- Monitor agent performance, engagement metrics, and behavioral drift in production

## Must Have

- **5+ years** of backend or ML engineering experience, with hands-on work deploying AI/ML models to production
- Experience with **LLM fine-tuning**, **prompt engineering**, and inference optimization
- Strong proficiency in **Python**; experience with **Golang** is a plus
- Experience building and operating **API services** and **data pipelines** at scale
- Familiarity with **reinforcement learning** techniques (**RLHF**, reward modeling) or agent framework development
- Understanding of **multi-model architectures** — orchestrating multiple models or agents to collaborate on tasks
- Experience deploying applications that integrate with third-party platforms and APIs (social media, messaging, commerce)
- Strong systems thinking — comfortable reasoning about **distributed systems**, scaling, and reliability
- Exceptional problem-solving and communication skills

## Nice to Have

- Experience with **character AI**, conversational AI, or NPC behavior systems
- Background in gaming, entertainment, or media technology
- Experience with **multi-modal AI** (voice, image, video generation or processing)
- Familiarity with **blockchain** infrastructure, on-chain payments, or crypto-native commerce
- Experience with **MCP (Model Context Protocol)** or agent-to-agent communication protocols
- Understanding of content safety, trust & safety systems, or responsible AI practices
- Contributions to open-source AI/ML projects

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**Apply:** https://hotfix.jobs/jobs/3a020e06-4cc9-47c2-95c7-df33f4f1788e
**Canonical:** https://hotfix.jobs/jobs/3a020e06-4cc9-47c2-95c7-df33f4f1788e