Senior Frontend Software Engineer

York is seeking a Senior Frontend 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 own the frontend experience end-to-end, from design system management to the real-time telemetry dashboards that satellite operators depend on in high-stakes environments. You'll partner closely with UI/UX, backend engineers, and operators to build interfaces that are fast, reliable, and intuitive under pressure, tackling difficult problems like:

Visualizing live satellite state across a constellation
Surfacing alerts during critical mission windows
Designing workflows to transfer data between air-gapped environments
Ensuring full UI functionality during the transfer of control between Mission Operation Centers

You'll also drive frontend best practices across the team and help junior engineers grow their craft.
Prior space-industry experience is not required.

Position Details

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

Responsibilities

Lead development of user-facing features using TypeScript and React, collaborating closely with UI/UX and backend engineers to deliver cohesive, performant experiences
Translate designs and requirements into high-quality, maintainable code that meets both functional and visual standards
Build and own reusable components, shared libraries, and design systems that scale across the platform
Engineer frontend algorithms and business logic to support scalability, automation, and near-real-time data presentation
Write unit tests and documentation for internal users and customers
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 frontend best practices and design system standards across the team

Required Qualifications

Bachelor's degree in Computer Science or related field
6+ years of software engineering experience with a strong focus on frontend and web application development
Deep proficiency in modern React, including component architecture, performance optimization, and state management patterns
Strong expertise in TypeScript and its application in large-scale frontend codebases
Experience building and maintaining design systems and shared component libraries
Proficiency with common front-end tooling such as Yarn, Babel, and Material-UI
Experience with Git in a collaborative, multi-contributor environment
Familiarity with backend APIs and the ability to design and consume REST APIs effectively
Demonstrated ability to mentor engineers and drive frontend code quality through reviews and design discussions
Proven ability to collaborate across engineering, UI/UX, 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 with modern state management tools such as TanStack Query
Experience with WebAssembly (WASM) for performance-critical frontend workloads
Experience with WebGL or other canvas-based rendering for data-rich environments
Experience with offline-first development architecture and local data synchronization strategies