Senior Full-Stack Engineer

Elder Research • Arlington, VA

1d • Hybrid

About The Position

Elder Research Inc., a wholly owned subsidiary of MANTECH International Corporation seeks a motivated, career and customer-oriented Senior Full-Stack Engineer to join our team in Arlington, VA who will help lead development of the analytics platform. This is a high-ownership role: you'll drive front-end architecture decisions, contribute meaningfully to Python backend services, mentor engineers on the team, and ship complex features end-to-end. The balance between front-end and back-end work in this role evolves with the product—some sprints emphasize UI development, while others focus on Python-based pipelines and document-processing services. We’re seeking a true full-stack engineer who is equally comfortable operating across both layers and can adapt as priorities shift, rather than someone with a strong bias toward one side of the stack. As a Sr. Full-Stack Engineer, you will lead front-end architecture for a growing internal platform, driving component design, state management, routing, and performance optimization, while also contributing to Python backends that power document processing, OCR, summarization, and inference pipelines. You will build end-to-end large-scale PDF upload workflows with chunking, resumability, progress feedback, and robust error handling, supported by scalable Python services, and develop interactive prompt-guidance and conversation continuity features, including context upload and deep integration with OCR and inference systems.

Requirements

• Expert-level TypeScript and React, with a track record of owning complex front-end systems end-to-end
• Strong, production-grade Python skills: not just scripting, but building and maintaining backend utilities, integrating with microservices, and contributing to data and inference pipelines
• Comfort moving fluidly between front-end and backend work sprint-to-sprint without a strong preference for either
• Proven delivery of large-file upload systems (chunking, resumable uploads, error recovery)
• Hands-on experience with browser APIs (File API, Streams, Web Workers) and front-end performance profiling
• Experience mentoring engineers and leading technical design discussions
• Strong Git/GitHub fluency and CI/CD experience
• Demonstrated accessibility experience – hands-on work with WCAG or Section 508 compliance

Nice To Haves

• Experience building analytics or AI-assisted internal tooling
• Familiarity with OCR and document-processing systems
• Experience with serverless architectures (Lambda, S3-based pipelines)
• Experience in regulated or security-conscious development environments
• Comfort working in cross-disciplinary teams alongside data scientists and cloud engineers

Responsibilities

• Build and maintain strongly typed front-end components using TypeScript and React, including complex document and conversation workflows integrated with Python services
• Develop advanced file upload interfaces with chunking, resumable flows, progress tracking, and resilient error handling
• Leverage browser APIs (File API, Streams, Web Workers) and optimize front-end performance
• Lead front-end architecture decisions, design reviews, and establish component standards
• Develop and extend Python backend utilities for document processing, chat/inference, OCR, and pipeline orchestration
• Write Python scripts for QA automation, data validation, CI/CD, and support serverless/containerized workflows
• Mentor engineers, lead technical discussions, and produce clear internal documentation
• Ensure accessibility (WCAG 2.1 / Section 508), testing coverage, and strong GitHub/CI/CD governance practices

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed