Join SpaceXSI as a Software Engineer to build critical backend services for developer tools in a fast-paced environment.
Posted by employer 18 hours ago
First seen on Joblaze 52 minutes ago
Last verified on the company career page 52 minutes ago
Skills & Technologies
What you'll build
- Own authentication architecture
- Power agent backend infrastructure
- Build webhook server
- Harden SCM integrations
- Drive agent reliability
Must have
- Experience building and operating backend services in production
- Experience working with APIs and third-party integrations
Nice to have
- Experience with auth systems
- Experience working on agentic products
- Care about clean abstractions
- Strong software engineering fundamentals
- Experience with authentication frameworks
AI in the day-to-day
SpaceXSI is building Super Intelligence to help humanity understand the universe.
Not disclosed in this posting: years of experience, visa sponsorship.
Benefits
Joblaze summary
In the role of Software Engineer on the Core Services team at SpaceXSI, the individual will develop and maintain essential backend systems that support authentication, webhooks, and agent workflows. Key skills include experience with backend services, APIs, and a focus on reliability and performance, particularly in complex systems. This position is well-suited for engineers with a strong foundation in software development and a passion for creating clean, scalable architectures. The team is engaged in innovative projects that aim to redefine developer tools and enhance the overall user experience.
Joblaze insights
- Listed today — first seen on Joblaze November 10, 2026. Last confirmed on Cursor's careers page November 10, 2026.
- This exact title is also open at 1 other location at Cursor: San Francisco, CA.
- Salary band is below the typical range for Backend roles (median ~$180,000).
- Starts above 49% of 142 comparable mid backend roles in United States we track (median $140,000 across 57 companies).
- API appears in 2.6% of 267 comparable mid backend roles in United States; JWT appears in 0.4% of 267 comparable mid backend roles in United States.
Quick facts
- Is the Software Engineer, Core Services role remote?
- No — this is an on-site role in San Francisco, CA, United States.
- What's the salary range?
- Cursor lists $140,000–$225,000 for this role.
- Where is the role based?
- Cursor is hiring for this position in San Francisco, CA, United States.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: API, JWT, OAuth, RBAC, event-driven architectures.
- What seniority level is this role?
- Cursor targets mid-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Software Engineer, Core Services role at Cursor.
From the original posting
SOFTWARE ENGINEER, CORE SERVICES
As a Software Engineer on the Core Services team at SpaceXSI, you'll own the critical shared services that sit between our product surfaces and the infrastructure layer: auth, webhooks, and the backend systems that power agent workflows. SpaceXSI is redefining how developers write code, and your work is what makes that possible at scale. You'll build the systems that every product team depends on, ensuring they are reliable, well-abstracted, and ready for whatever comes next.
RESPONSIBILITIES:
Own authentication: designing and implementing a scalable auth architecture that secures one of the most widely-used developer tools in the world
Powering the agent backend: owning the infrastructure behind Cursor's agent workflows, optimizing for end-to-end performance and reliability as agents become central to the developer experience
Build a robust webhook server: handling high-throughput event delivery with proper retry semantics, dead-letter queues, and observability so external integrations just work
Harden SCM integrations: building resilient abstractions over source control providers so Cursor stays rock-solid regardless of third-party conditions
Drive end-to-end agent reliability: partnering with the client and inference teams to improve the full path from user action to agent response, closing the loop on one of the hardest problems in AI-powered development
BASIC QUALIFICATIONS:
Experience building and operating backend services in production. Experience working with APIs and third-party integrations.
PREFERRED SKILLS AND EXPERIENCE:
Experience with auth systems, API gateways, or webhook infrastructure
Experience working on agentic products or infrastructure and strong opinions on reliability and performance of complex multi-step systems
Care deeply about clean abstractions, well-defined service contracts, and making it easy for other engineers to build on top of your work
Strong software engineering fundamentals and enjoying owning the full lifecycle of production services
Experience with authentication/authorization frameworks (OAuth, JWTs, RBAC), event-driven architectures, or building developer-facing platform services is a plus
ADDITIONAL REQUIREMENTS:
If there appears to be a fit, we'll reach out to schedule 2-3 short technicals. After, we'll schedule an onsite in our office, where you'll work on a small project, discuss ideas, and meet the team
COMPENSATION AND BENEFITS:
The annual compensation range for this role is listed below.
Annual Salary:
$140,000 - $225,000 USD
Your actual level and base salary will be determined on a case-by-case basis and may vary based on the following considerations: job-related knowledge and skills, education, and experience.
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.
Standard company text repeated across Cursor's postings is omitted here.