# Staff Software Engineer, Agent Platform

**Company:** [Replit](https://hotfix.jobs/companies/replit)
**Location:** Foster City, CA
**Role:** Backend Engineering
**Salary:** $250k – $365k/yr
**Experience:** 5+ years
**Skills:** Backend Development, Full-Stack, AI Tools, Operational Transforms, Ot, Crdts, Git, Event Sourcing, Streaming Services, Systems Engineering, Developer Experience
**Posted:** 2026-04-14

> Build high-throughput backend services, collaborative multiplayer systems for AI agents, and full-stack infrastructure to enhance the Agent platform. Requires 5+ years in backend/systems engineering with full-stack experience preferred.

## Job Description

## Responsibilities
- Build high-throughput backend applications and services, like streaming chat between user and agent.
- Design a collaborative \"Multiplayer Computer\" that lets humans and AI agents work together on shared shells, filesystems, and state—conflict-free and in real time.
- Develop infrastructure (frontend & backend) that empowers product engineers to rapidly ship delightful user experiences.
- Design and build durable, well-crafted interfaces between the Agent and internal systems, as well as external agentic systems (MCP).

## Required Skills and Experience
- 5+ years professional experience in building backend services, systems and platforms.
- Someone who values simplicity and pragmatism—you think radically but ship incrementally.
- Self-directed and comfortable working autonomously.
- Collaborative and team-oriented with a strong sense of shared ownership.

## Preferred Qualifications
- Experience across the full-stack.
- Experience building AI powered tooling or products.
- Experience with collaborative editing technologies such as **Operational Transforms (OT)**, **CRDTs**, or the inner workings of Git.
- Experience with event sourcing systems.

## What We Value
- Problem-solving mindset: Ability to approach complex operational challenges systematically and devise effective solutions.
- Self-directed and autonomous: Capable of working independently while collaborating effectively with cross-functional teams.
- Strong communication skills: Ability to explain complex technical concepts to both technical and non-technical audiences.
- Continuous learning: Passion for staying current with industry best practices and new technologies.
- Focus on automation: Strong belief in automating repetitive tasks and building self-healing systems.

## Full-Time Employee Benefits Include
- Competitive Salary & Equity
- 401(k) Program with a 4% match
- Health, Dental, Vision and Life Insurance
- Short Term and Long Term Disability
- Paid Parental, Medical, Caregiver Leave
- Commuter Benefits
- Monthly Wellness Stipend
- Autonomous Work Environment
- In Office Set-Up Reimbursement
- Flexible Time Off (FTO) + Holidays
- Quarterly Team Gatherings
- In Office Amenities

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**Apply:** https://hotfix.jobs/jobs/b1c682b5-6aab-48bf-904a-863ebeac73ea
**Canonical:** https://hotfix.jobs/jobs/b1c682b5-6aab-48bf-904a-863ebeac73ea