Full-Time

Ground Software Engineer

Mid-Career

Posted on 9/18/2025

Millennium Space Systems

Millennium Space Systems

501-1,000 employees

Delivers national-security space missions and constellations

Compensation Overview

$167.4k - $246.3k/yr

El Segundo, CA, USA

In Person

Category
Software Engineering (1)
Required Skills
Kubernetes
FastAPI
Python
JavaScript
Software Testing
InfluxDB
Postgres
Infrastructure as Code (IaC)
Docker
MongoDB
REST APIs
Flask
Requirements
  • Bachelor’s degree in Computer Science, Computer Engineering, Aerospace Engineering, or a related field
  • Five (5) or more years of experience designing and developing software in a production environment
  • Demonstrated experience writing scripts and backend software applications in Python
  • Demonstrated experience with Python webserver frameworks (Twisted, Flask, FastAPI) and building RESTful web services in conjunction with message broker architectures
  • Demonstrated experience with backend development interacting with relational, time-series, and document databases (PostgreSQL, InfluxDB, MongoDB)
  • Comfortable building interactive UIs using Javascript frameworks
  • Familiarity with GitLab CI/CD and Infrastructure as Code practices
  • Familiarity with containerization and container orchestration practices using Docker, Podman, and Kubernetes
  • Experience with unit testing, integration tests, and end-to-end testing
  • Comfortable communicating technical details verbally and in writing
  • Experience with iterative and agile software development
  • Ability to obtain TS/SCI clearance
  • Applicants MUST be U.S. citizens and eligible for security clearance
Responsibilities
  • Leads the design, development, integration, testing, and delivery of large-scale ground software and mission control systems
  • Interacts with other Millennium staff to support testing on components, subsystems, and spacecraft in test configurations
  • Integrates Millennium software applications into Government-furnished software and infrastructure
  • Executes integrated system test events bridging Millennium-developed products and Government-furnished systems
  • Implements specific mission data processing applications into existing systems to support payloads and end data users
  • Supports software testing and installation in classified environments
  • Guides junior developers through development tasks, troubleshooting exercises
  • Plans and executes validation/verification testing
  • Contributes to ground software or tool development by completing larger feature requests, taking ownership of larger software modules, analysis packages, and workflows
Desired Qualifications
  • Active TS/SCI clearance
Millennium Space Systems

Millennium Space Systems

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Millennium Space Systems provides space systems for national security, delivering missile-warning and other space missions by rapidly creating affordable prototypes and satellite constellations across different orbits. Its products are designed to work correctly the first time, with an emphasis on speed to meet customer needs. The company differentiates itself by offering fast, cost-effective prototype-and-constellation solutions rather than long, expensive development cycles, focusing on reliable performance for critical space missions. The goal is to enable secure, rapid, and dependable space capabilities for national security customers.

Company Size

501-1,000

Company Stage

N/A

Total Funding

N/A

Headquarters

El Segundo, California

Founded

2001

Simplify Jobs

Simplify's Take

What believers are saying

  • Targeting 26 satellite deliveries in 2026, up from 4 in 2025 via El Segundo investments.
  • Tony Gingiss appointed CEO December 9, 2024, drives Boeing-Millennium integration.
  • Delivered TRACERS satellites to Vandenberg June 16, 2025 for NASA mission.

What critics are saying

  • Production fails 550% ramp to 26 satellites in 2026, slips schedules 6-12 months.
  • Resolute design delays past 2026 bid-ready, loses to Relativity Space.
  • FOO Fighter fails 2027-2028 testing, Space Development Agency terminates $414M contract.

What makes Millennium Space Systems unique

  • Resolute platform fills 2-4 kW gap between Millennium small sats and Boeing large sats.
  • FOO Fighter delivers fire-control sensing for hypersonic missile tracking in LEO.
  • Secured spot on Space Force’s $1.84B RG-XX Andromeda contract for GEO reconnaissance.

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Benefits

Professional Development Budget

401(k) Company Match

Remote Work Options

Paid Vacation

Paid Sick Leave

Paid Holidays

Hybrid Work Options

Mental Health Support

Wellness Program

Company News

PR Newswire
Jun 16th, 2025
Millennium Space Systems Delivers Pair Of Space Vehicles To Launch Site For Nasa'S Tracers Mission

EL SEGUNDO, Calif., June 16, 2025 /PRNewswire/ -- Millennium Space Systems, a Boeing Company, delivered two space vehicles for NASA's Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS) mission to Vandenberg Space Force Base Friday, marking a key milestone in preparation for launch later this year

Envision
Apr 9th, 2025
Boeing's bet: supercharge satellite production

When Envision Employment Services Incorporated acquired Millennium in 2018, it built prototypes and delivered one or two satellites a year.

Stock Titan
Dec 16th, 2024
Millennium Space Systems Names Tony Gingiss as CEO

Millennium Space Systems, a Boeing Company [NYSE: BA], has appointed Tony Gingiss as its new CEO effective December 9, 2024.

Military News
Oct 28th, 2024
U.S. Enhances Early Warning System with New Satellite Batch for Epoch Program

Millennium Space Systems signed the initial contract to deliver the first six satellites for MTC Epoch 1 in 2023.

SpaceNews
Aug 29th, 2024
Firefly names space industry veteran Jason Kim as new CEO

Kim joins Firefly from Millennium Space, a Boeing subsidiary specializing in small satellites primarily for U.S. government agencies, where he served as CEO.

INACTIVE