SOFTWARE DEVELOPER/ENGINEER (CYBER)

Quantum Research International; Huntsville (AL); On-site; USD 90,000 - 130,000; Full time

Job summary

Quantum Research International, Inc. is seeking an Intermediate Software Developer/Engineer to support a RAG-based AI application using LLMs for secure, government-grade inference and response generation.

The role emphasizes building reliable AI-enabled systems with strong software engineering across multiple languages. The candidate will design, develop, and optimize RAG pipelines, integration with vector stores, embeddings, and backend services in .NET/C#, Go, or Python, while ensuring

Qualifications

• Active TS or ability to obtain TS/SCI clearance.
• 3+ years of professional software development experience.
• Experience with at least two of the following languages: .NET/C#, Go, Python.
• Familiarity with AI/ML fundamentals including embeddings, vector search, RAG patterns, and LLM inference.
• Experience building RESTful APIs, microservices, or backend systems.
• Experience with open AI models in local/self-hosted environments.

Responsibilities

• Design, develop, and maintain RAG pipelines with vector databases, embeddings, and LLMs for context-aware inference.
• Implement and optimize retrieval logic, prompts, and post-processing of LLM outputs.
• Build and integrate backend services using .NET/C#, Go, and/or Python.
• Collaborate with AI/ML engineers, data scientists, and stakeholders to translate requirements into production-grade features.
• Ensure security, performance, scalability, and compliance with government standards.
• Troubleshoot and optimize AI-assisted workflows including latency, accuracy, and cost.
• Participate in code reviews, testing, and documentation in an Agile environment.

Skills

.NET/C#

Go (Golang)

Python

RESTful APIs

Microservices

Backend systems

AI/ML fundamentals

Security/compliance

Job description

Quantum Research International, Inc (Quantum) provides our national defense and federal civilian and industry customers with services and products in the following main areas: 1) Cybersecurity and Information Operations; 2) Space Operations and Control; 3) Aviation Systems; 4) Ground, Air and Missile Defense, and Fires Support Systems; 5) Intelligence Programs Support; 6) Experimentation and Test; 7) Program Management; and 8) Audio/Visual Technology Applications. Quantum's Corporate Office is located in Huntsville, AL, but Quantum actively hires for positions nationwide and internationally. We pride ourselves on providing high quality support to the U.S. Government and our Nation's Warfighters. In addition to our corporate office, we have physical locations in Colorado Springs, CO; Crestview, FL; Orlando, FL; and Tupelo, MS.

Mission

Quantum Research International is seeking an Intermediate Software Developer/Engineer to support the development and enhancement of a Retrieval-Augmented Generation (RAG) application that leverages Large Language Models (LLMs) for intelligent inference and response generation. This is a government contract role focused on building secure, reliable AI-assisted systems. The ideal candidate has strong software engineering skills across multiple languages and a solid understanding of AI/ML concepts, with hands‑on interest in applied LLM technologies.

Job Responsibilities

• Design, develop, and maintain RAG pipelines integrating vector databases, embeddings, and LLMs for accurate, context‑aware inference.
• Implement and optimize retrieval logic, prompt engineering, and post‑processing of LLM outputs.
• Build and integrate backend services using .NET/C#, Go, and/or Python.
• Collaborate with AI/ML engineers, data scientists, and stakeholders to translate requirements into production‑grade features.
• Ensure application security, performance, scalability, and compliance with government standards.
• Troubleshoot and optimize AI‑assisted workflows, including latency, accuracy, and cost considerations.
• Participate in code reviews, testing, and documentation in an Agile environment.

Required Skills / Qualifications

• Active TS or ability to obtain TS/SCI clearance.
• At least 3+ years of professional software development experience.
• Strong experience in at least two of the following: .NET/C#, Go (Golang), Python. Solid understanding of all languages listed is a plus.
• Familiarity at the developer level with AI/ML fundamentals, including embeddings and vector searching, RAG patterns, LLM inference (prompting, context windows, token management), and basic evaluation metrics for generative AI.
• Experience building RESTful APIs, microservices, or backend systems.
• Experience with non‑frontier (open) AI models running in local or self‑hosted environments.

Desired Skills And Qualifications

• Direct experience developing and deploying AI‑assisted applications (chatbots, knowledge assistants, document intelligence tools).
• Hands‑on work with RAG frameworks/tools such as LangChain, LlamaIndex or similar.
• Experience implementing vector databases such as Pinecone, Weaviate, Chroma, pgvector, etc.
• Familiarity with Python data/AI ecosystem (NumPy, Pandas, Hugging Face, sentence‑transformers).
• Knowledge of .NET integrations with AI services or Go‑based backend services for high‑performance AI workloads.
• Experience developing in secure/controlled environments (FedRAMP, gov‑cloud, air‑gapped enclaves).
• Understanding of MLOps basics (model versioning, monitoring, CI/CD for AI).

Equal Opportunity Employer/Affirmative Action Employer M/F/D/V

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, disability, veteran status, genetic information, sexual orientation, gender identity, or any other characteristic protected by law. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.