Senior Developer

Reflexive Concepts is seeking a skilled Senior Developer to join our team!

• Lead a small, collaborative development team supporting the sustainment and continuous enhancement of a mission-critical Enterprise Support Services application that enables a key operation.
• Serve as a senior technical point of contact between the development team and the customer, helping translate customer needs into clear, actionable technical requirements and solutions.
• Engage with customers and stakeholders to understand business needs, communicate technical approaches, refine requirements, and build alignment and buy-in for proposed solutions.
• Build intuitive, responsive web interfaces backed by robust data retrieval and storage capabilities.
• Apply hands‑on expertise with modern Python frameworks, such as Django, FastAPI, or Flask, to deliver scalable, secure, and performant applications.
• Apply hands‑on expertise with modern JavaScript and front‑end frameworks, specifically React.js and Vue.js, to deliver high‑quality user interfaces and dynamic, client‑side application features.
• Integrate backend services through RESTful APIs to support seamless data flow and reliable application functionality.
• Leverage full‑stack development skills across Python backend services and modern JavaScript front‑end architectures to deliver scalable, end-to-end solutions.
• Demonstrate strong experience with relational database management systems (RDBMS), with primary expertise in PostgreSQL and secondary experience with Oracle and SQL Server.
• Translate complex business requirements into effective enhancements within existing database structures and application logic.
• Support and execute application upgrades while implementing code enhancements that improve performance, maintainability, and long‑term sustainability.
• Develop efficient data retrieval solutions that power user‑friendly displays and dynamic application views.
• Diagnose, troubleshoot, and resolve application defects to help maintain system stability and a positive user experience.
• Design, build, and deploy Docker containerized applications to Linux servers.
• Conduct thorough unit testing to validate software reliability, performance, and feature accuracy.
• Collaborate within Git/Git Lab workflows and contribute to CI/CD pipelines that enable smooth, automated delivery of application updates.
• Bring a proactive, ownership‑oriented approach to problem‑solving, provide technical leadership to the development team, and demonstrate a strong willingness to take on new challenges and learn emerging technologies.
• Actively contribute in an Agile environment by participating in sprint planning, backlog grooming, and iterative development cycles that deliver continuous value.

• Active TS/SCI security clearance with Full Scope (FS) Polygraph.
• A bachelor's degree in a technical discipline and twelve (12) years of experience in software development/engineering. Sixteen (16) years of experience in software development/engineering may be substituted in lieu of a degree.
• Working knowledge of JavaScript and modern front‑end frameworks, specifically React.js and Vue.js.
• Experience with REST APIs.
• Experience with modern Python full-stack development, utilizing Python web frameworks (such as Django, FastAPI, or Flask) paired with modern front‑end frameworks (React.js or Vue.js) and RESTful API integrations.
• Unit testing experience.
• Git/Git Lab experience with CI/CD.
• Experience with Docker.
• Working knowledge of Linux.
• Working knowledge of Agile software development processes.

• Extensive experience in agile development, including running sprint planning sessions, managing sprint backlogs, and delivering high‑quality results on time.
• A background in developing enterprise‑level applications with a focus on scalability, security, and performance.
• Experience managing systems in a virtual hosting environment, including AWS.
• Familiarity with CI/CD.