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York Space Systems was founded to radically improve spacecraft affordability and reliability, transforming, and enabling next- generation space mission operations worldwide. Today, York is one of the most innovative aerospace companies, specializing in end-to-end customer solutions and the rapid production of spacecraft platforms. York's complete Space Segment Solution includes spacecraft production, payload integration, system integration & test, launch services, ground segment services, and mission operations, enabling customers to leverage York's existing technology solutions to get to orbit rapidly and responsively. We're looking to expand our team across the board.
York Space Systems is seeking a Senior Full Stack Software Engineer who is passionate about building software that pushes the bounds of what's possible. Our software is a modern web-based application (React/TypeScript, C# .NET) with a microservice infrastructure (Docker, Kafka, REST) that operators use to monitor and control constellations of spacecraft across several active missions.
As a senior member of the team, you'll take end-to-end ownership of complex features, drive technical planning and breakdown, and actively invest in the growth of the engineers around you. You'll work closely with engineers, satellite operators, customers, and UI/UX to tackle hard problems like:

• Collision avoidance, conjunction analysis, and orbit-raising maneuver planning
• Operation center failover and continuity of control
• Cross-satellite network maintenance and space-to-ground link management
• Ground station contact scheduling and pass optimization
• Multi-vehicle mission coordination

Your work will be integrated with our in-house simulation software and deployed in Mission Operation Centers where it directly supports active missions in orbit.
Prior space-industry experience is not required.
Position Details

• Team size: 6-8 developers
• Remote Policy: Hybrid (4 days in office)

Responsibilities

• Develop key user-facing features to support both current and future missions using TypeScript, React, C#, MSSQL, InfluxDB, Kafka, and Python
• Translate designs and requirements into high-quality, maintainable code
• Build reusable components, shared libraries, and scalable services for use across the platform
• Engineer algorithms and business logic to promote scalability and automation
• Write unit tests and documentation for internal users and customers
• Write integration tests against simulation tools to validate behavior against realistic mission scenarios
• Participate in agile ceremonies including sprint planning, standups, and retrospectives
• Other duties as assigned

Team Leadership

• Collaborate with engineers, operators, UI/UX, and customers across departments
• Mentor junior and mid-level engineers through code reviews, pair programming, and design discussions
• Contribute to sprint planning, technical scoping, and cross-team alignment on feature work
• Help establish and advocate for engineering best practices across the team

Required Qualifications

• Bachelor's degree in Computer Science or related field
• 6+ years of full-stack software engineering experience
• Deep expertise in strongly typed backend languages, particularly C#, including multithreaded applications, concurrency patterns, and near-real-time data handling
• Strong proficiency in modern React and its core principles, including component architecture and performance optimization
• Experience designing and consuming REST APIs at scale
• Experience with SQL databases, including schema design and query optimization
• Proficiency with common front-end tooling such as Yarn, Babel, and Material-UI
• Experience with Git in a collaborative, multi-contributor environment
• Demonstrated ability to mentor engineers and drive code quality through reviews and design discussions
• Proven ability to collaborate across engineering, design, and operational stakeholders
• Exceptional problem-solving skills with the ability to navigate ambiguous requirements independently and drive to resolution
• Strong verbal and written communication skills, including presenting technical concepts to non-technical audiences
• Ability to thrive in a fast-paced, mission-driven environment
• Active security clearance or ability to obtain one

Preferred Qualifications

• Experience working across a polyglot stack including Python, Kafka, and InfluxDB
• Experience with modern state management tools such as TanStack Query
• Experience designing and executing forward and backward compatible database migrations and deployment strategies in live production environments
• Experience with feature flagging strategies, including gradual rollouts, environment-based toggles, and flag lifecycle management
• Experience with container-based installation and deployment strategies, including Docker and CI/CD pipeline integration
• Experience managing backend caching layers, including cache invalidation strategies and distributed cache patterns in resource-constrained environments
• Familiarity with modern security practices including API token management, CUI or classified information handling, and/or air-gapped environments

In compliance with local law, we are disclosing the compensation, or a range thereof, for roles in locations where legally required. Actual salaries will vary based on several factors, including but not limited to external market data, internal equity, location, skill set, experience, and/or performance.
Benefits

• 100% employer-paid medical, dental, and vision insurance (subject to spousal surcharge).
• Company holidays, floating holidays, and sick time.
• Unlimited PTO.
• Generous 401(k) match.

How To Apply
Interested candidates are encouraged to apply by clicking the "Apply" link at the top of the page. York Space Systems will be accepting applications on a rolling basis until the position is closed. York Space Systems provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, military or protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. Must have permanent authorization to work in the United States. This policy applies to all terms and conditions or employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. YORK SPACE SYSTEMS IS AN EEO EMPLOYER.