Sr. Software Engineer, Ads Product

SpaceXSI•Palo Alto, CA

19h•$180,000 - $330,000

About The Position

SpaceXSI is building Super Intelligence and developing a full stack that includes compute infrastructure, Grok models, and applications such as Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. The Sr. Software Engineer, Ads Product will help rebuild and transform the X Ads Platform using SpaceXSI infrastructure and AI capabilities. The role spans product engineering, backend systems, infrastructure, and AI-powered features that affect a major part of X’s revenue. It suits engineers who learn quickly, ship effectively, and want to build and improve high-scale products. Deep prior advertising experience is not required, but the engineer should be interested in learning how large-scale advertising systems work.

Requirements

At least 5 years of experience building software through internships, projects, research, open-source work, startups, or full-time roles.

Nice To Haves

Strong software engineering fundamentals.
Ability to write clean, maintainable code and learn new codebases quickly.
Strong problem-solving skills and comfort working through ambiguity.
Interest in backend systems, distributed systems, data pipelines, product engineering, or AI applications.
A bias toward action, including shipping, learning from real users, and improving quickly.
Strong ownership mindset and willingness to take responsibility for meaningful parts of the product.
Excitement about building high-quality product experiences for advertisers and users.
Experience with ads, recommendations, search, ranking, marketplaces, payments, analytics, or growth systems.
Experience working with large-scale backend systems or data processing pipelines.
Experience with React, Golang, Python, Rust, gRPC, Java, or Scala.
Experience with machine learning, LLMs, experimentation, ranking, or optimization systems.
Prior startup, research, internship, or high-impact project experience.

Responsibilities

Build and ship product features across the X Ads Platform.
Work on systems related to ad delivery, targeting, optimization, measurement, and advertiser experience.
Use SpaceXSI infrastructure and AI capabilities to improve advertising product performance and quality.
Contribute to distributed systems that need to be reliable, fast, and scalable.
Collaborate with engineers, product leads, and cross-functional partners to turn ideas into working products.
Learn quickly, take ownership, and execute in a fast-moving environment.
Debug, maintain, and improve production systems serving users and supporting significant business impact.