Sr. Full Stack Developer

Expression is seeking a highly skilled and experienced Senior Full Stack Developer with a passion for technology and problem-solving to join their team. The ideal candidate should be proficient in both front-end and back-end development, with a focus on developing and maintaining web-based applications and systems using modern technologies.

In this position, you will have opportunities to work with small, feature-focused teams to engineer solutions, mentor team members, and collaborate with their staff of data scientists, DevSecOps engineers, and product designers to contribute to their Agile development process. You should be knowledgeable and customer-oriented, possessing strong communication and presentation skills.

Location & Qualifications:

• Fully remote, full time, must be a US Citizen eligible for a DoD Secret clearance.
• An active Secret clearance is nice-to-have but optional.
• Residence or willingness to relocate to the DC area, and to work hybrid on-site is nice-to-have but optional.

• Education: Associates degree or higher in Engineering, Computer Science, or related field and/or equivalent experience in industry as Software Engineer.
• Experience:
  • Strong fundamental programming skills; you should be familiar with SOLID design principles, have good intuition for code quality, be able to read and understand unfamiliar code quickly, and be able to write excellent, readable code and tests, with attention to both detail and expediency.
  • Senior-level proficiency with React frontend application development, including functional components, utilizing and creating hooks, local and remote state management, component and rendering lifecycles, CSS-in-JS styling, and component-driven development.
  • Senior-level proficiency with the Express.js backend framework and related technologies such as GraphQL, REST, at least one ORM (Drizzle/TypeORM/Knex/Sequelize). It is expected that you will be comfortable defining database migrations, writing queries, mutations and resolvers, and be able to write code connecting backend Express.js services to external APIs.
  • Senior-level experience with TypeScript; you should understand how to inspect types within libraries, use utility types, and intelligently engineer interfaces. You should understand the distinction between compile-time typing and runtime typing.
  • Proficiency with Git VCS and GitFlow. You should have experience with the branch-and-merge process, selecting release candidates, and producing and backporting hotfixes.
  • Skills:
    • Superior, independent problem-solving and communication skills; this position requires not only the ability to understand complex interfaces, workflows and data, but also the ability to simplify and communicate those ideas to less-experienced developers.
    • Ability to perform thorough code review and mentor junior and mid level developers, supplying them with useful feedback that enables them to grow with each MR and maintain the quality of the codebase and product.

• Familiarity with the Agile process, particularly Scrum.
• Familiarity with real-time geospatial data visualization and streaming using any of the following, or similar technologies: Mapbox, WebGL, D3.js, Visx, Charts.js, Protobuffers, GraphQL Subscriptions, SSE, Websockets.
• Deep knowledge of PostgreSQL + PostGIS; you should be able to synthesize, understand and modify complex geospatial/temporal queries, have a thorough understanding of query optimization, indexing and partitioning in support of high-volume analytical workloads.
• Either experience with spectrum or RF engineering, or related skills such as familiarity with undergraduate-level physics. Alternatively, a demonstrable history of learning and then problem-solving within complex, unfamiliar technical domains quickly.
• Experience collaborating with product design teams, data scientists/engineers, ISSOs, and government stakeholders.
• AWS Cloud Developer-level experience; with a solid understanding of CI/CD, containers, networking, managed services, as well as troubleshooting & supporting deployment within a high-security production environment.