Sr. Software Engineer, X Developer Platform
- Salary
- $180,000 - $330,000
- Level
- Senior
Not stated in the posting: work type, visa.
Open. First seen 2 October 2026.
About the role
SpaceXSI's standard text
SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.
SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.
SR. SOFTWARE ENGINEER, X DEVELOPER PLATFORM
The X Developer Platform team owns the partner ecosystem that connects X with B2B and B2C developers around the world. X reaches more than 500 million active users who produce billions of posts every week, and that activity generates signals and capabilities that go far beyond a conversation to listen to: real-time knowledge of what is happening in the world, rich media, commerce, communities, and the connective tissue between people, businesses, and now agents. Our job is to make that value available to developers as the everything API, so that anyone can build products on top of X.
Our mission is to help achieve the X Everything app and make X the clear digital townsquare of Earth. We do this by making X data and functionality available through a consistent and reliable API suite, so that developers and the emerging world of agents can realize its full potential. Behind the scenes we collect, process, enrich, and deliver hundreds of billions of signals a day.
The products we build are highly available, scalable, optimized, respectful of X's user base, and essential to the customers who depend on them. We work closely with our Product and Business counterparts and directly with customers to shape what we build next.
RESPONSIBILITIES:
- Collaborate with engineering, product leadership, business leadership, and engineers across the company
- Maintain and improve the systems that serve our existing customers while designing and shipping new products that expand what the platform can do
- Design clean, reliable, well-abstracted solutions to problems of scale, correctness, and developer experience
- Help shape the architecture of the platform as it grows to serve new categories of consumers, including agents and automated systems
BASIC QUALIFICATIONS:
- Bachelor's or master's degree in computer science
- 5+ years of industry experience working on commercial software application or services
PREFERRED SKILLS AND EXPERIENCE:
- Distributed systems experience (Kafka experience is a plus)
- Experience working with RPC frameworks and microservices
- Understanding of core CS concepts, such as, common data structures and algorithms
- Experience with front-end development technologies (e.g., HTML, CSS, JavaScript
- Experience with cloud platforms and services (e.g., AWS, Azure, Google Cloud)
COMPENSATION AND BENEFITS:
$180,000 - $330,000 USD
Base salary is just one part of our total rewards package at SpaceXSI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.
SpaceXSI's standard text
SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.
What this role asks for
74% of this description is written for the role. The rest is SpaceXSI's standard text, folded away below.
Compared with SpaceXSI's other open jobs.
The team: Engineering HIRES STEADILY
This role is one of 30 open in Engineering. 5 were posted in the last 30 days and the oldest in April: a team that hires all year rather than one being built.
WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS
Python (16 of 30), Rust (13 of 30), C++ (10 of 30), Golang (8 of 30), Java (8 of 30), Kafka (7 of 30), Machine Learning (7 of 30)
OTHER ROLES ON THIS TEAM
- Sr. Software Engineer, Data Engineering (X) posted Nov 6
- Sr. Software Engineer, Ads Product posted Nov 6
- Analytics Engineer (X) posted Nov 6
- Sr. Software Engineer, Linux Kernel posted Nov 6
- Senior Product Manager, Commerce Platform posted Oct 27
- Spring 2027 Software Engineering Internship/Co-op posted Oct 2
- Summer 2027 Software Engineering Internship/Co-op posted Oct 2
- Software Engineer, Evaluation Infrastructure posted Sep 30
- Sr. Network Engineer posted Sep 14
- Sr. Network Engineer posted Sep 14
- Sr. Analytics Engineer (X) posted Aug 12
- Sr. Software Engineer, Search Infrastructure posted Aug 6
- Software Engineer, Linux Kernel posted Aug 3
- Software Engineer, Evals posted Jul 22
- Sr. ML Infrastructure Engineer posted Jul 22
- Sr. Software Engineer, Platform Infrastructure posted Jul 20
- Software Engineer, Network Software & Services posted Jul 15
- Software Engineer, Data Engineering (X) posted Jul 12
- Software Engineer, Network (C++) posted Jul 2
- Network Operations Technician (Starlink) posted Jun 19
- Software Engineer, Ads Product posted Jun 2
- Software Engineer, Imagine Safety posted May 31
- Sr. Maching Learning Engineer, Search Ranking posted Apr 30
- Sr. Backend Engineer, API posted Apr 24
- Sr. Software Engineer, Consumer Subscriptions posted Apr 16
- Sr. Software Engineer, X Money posted Apr 14
- Sr. Machine Learning Engineer, Ads posted Dec 3
- Sr. Software Engineer, Network Software & Services posted Oct 15
- Sr. Machine Learning Engineer, Recommendation Systems posted Apr 11
From the team and dates on SpaceXSI's own job board.
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