Senior Software Engineer, Agent Platform

Foster City, CA · Remotefull timeRemote

Senior Software Engineer, Agent Platform at Replit · Lumi · Lumi

senior

$180k–$260k

H1B: yes

Replit Senior Software Engineer at Replit building tools to enhance the Agent experience and bridge AI and UX teams. Responsible for developing backend services, collaborative systems, and infrastructure to empower product engineers.

Responsibilities

This role blends systems engineering, developer experience and product engineering. We tackle complex challenges across the full stack, from browser-based interfaces to high-performance backends to Linux systems engineering. We’re looking for engineers who have a keen sense of the product experience and how to power it with performant systems.
On this team, you’ll have the opportunity to grow your skills across our infrastructure and product, and to lead end-to-end efforts with meaningful impact. We value diverse perspectives and encourage candidates from all backgrounds and experiences to apply.
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)

Qualification

Experience across the full-stackExperience with event sourcing systemsProblem-solving mindsetSelf-directed and autonomousStrong communication skillsContinuous learning

Required

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

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.
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