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Isys Technologies
Isys Technologies

60 Isys Technologies Software Performance Engineer Jobs Hiring Near You

Isys Technologies

IL · On-site

$85K - $92K/yr

I2X Technologies is seeking a Senior Network Software Engineer to support ongoing activities for a ... Conduct planning and performance of analytical research, design development, and other tasks to ...

Isys Technologies

Software Developer

Huntsville, AL · On-site

I2X Technologies is seeking a Software Engineer/Developer to support ongoing activities for a customer in Huntsville, AL . This position will be on-site and will require an active Secret. * Writing ...

Isys Technologies

IL · On-site

$102K - $109K/yr

I2X Technologies is seeking a Network Software Engineer Lead to support ongoing activities for a ... Conduct planning and performance of analytical research, design development, and other tasks to ...

Isys Technologies

Software Developer

Huntsville, AL · On-site

$110K - $130K/yr

I2X Technologies is seeking a Software Engineer/Developer to support ongoing activities for a customer in Huntsville, AL . This position will be on-site and will require an active Secret. * Writing ...

Isys Technologies

Software Developer

Huntsville, AL · On-site

I2X Technologies is seeking a Software Engineer/Developer to support ongoing activities for a customer in Huntsville, AL . This position will be on-site and will require an active Secret. * Writing ...

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Isys Technologies Jobs Information

What makes Isys Technologies an attractive place to work?

Isys Technologies is a reputable company in the technology sector, known for its commitment to delivering innovative solutions and exceptional customer service. The company's work environment is characterized by a culture of collaboration, innovation, and continuous learning, with opportunities for employees to work on diverse projects and contribute to the company's growth. Joining Isys Technologies offers professionals a chance to be part of a dynamic team, develop their skills, and make a meaningful impact in the industry.

What other companies are hiring for Software Performance Engineer jobs?

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What are the most popular categories at Isys Technologies?

Infographic showing various Software Performance Engineer job openings at Isys Technologies in the United States as of August 2026, with employment types broken down into 97% Full Time, and 3% Part Time. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution.

Journeyman LLM + Ontology Software Engineer

Isys Technologies

Omaha, NE • On-site

$92K - $105K/yr

Full-time

Re-posted 10 days ago

Job description

Minimum Clearance Required
TS/SCI
Responsibilities
I2X Technologies is a reputable technology services company to the Federal Government. Whether the focus is on space exploration, national security, cyber security, or cutting-edge engineering applications, I2X is ready to offer you the chance to make a real-world impact in your field and for your country. We provide long-term growth and development. Headquartered in Colorado, I2X is engaged in programs across the country and in more than 20 states. Our programs support multiple Federal agencies, the Department of Defense and often focused on the space initiatives of our government customers.
Job Description: Journeyman LLM + Ontology Software Engineer
I2X Technologies is seeking a Journeyman Journeyman LLM Engineer:
Job Summary: We are looking for a Journeyman LLM Engineer to develop and enhance intelligent applications that combine Large Language Models (LLMs) with formal ontologies and knowledge graphs.
Responsibilities:
  • Design and implement solutions that integrate LLMs with ontologies for improved accuracy and reasoning
  • Develop Retrieval-Augmented Generation (RAG) systems using ontology-based knowledge
  • Build and maintain knowledge graphs and ontologies to support LLM applications
  • Fine-tune, prompt engineer, and evaluate LLMs for specific business use cases
  • Create APIs and services that allow applications to interact with LLMs and ontology data
  • Ensure the reliability, scalability, and ethical use of LLM-powered features
  • Collaborate with data scientists, engineers, and domain experts

Qualifications
Requirements:
  • 3-6 years of experience in software engineering with a focus on AI/ML or LLM development
  • Solid experience and proficiency with Java for building scalable back-end services and integrating with LLMs
  • Strong hands-on experience working with Large Language Models
  • Practical experience with ontologies, knowledge graphs (RDF, OWL, or similar), and semantic technologies
  • Proficiency in Python and relevant frameworks (LangChain, LlamaIndex, etc.)
  • Experience with vector databases and retrieval systems
  • Solid understanding of software engineering best practices and version control (Git)

Preferred or Desirable to have:
  • Experience in ontology modeling or semantic web technologies
  • Knowledge of graph databases (Neo4j, GraphDB, etc.)
  • Familiarity with evaluation frameworks for LLMs
  • Experience with cloud platforms (AWS, Azure, or GCP)

Essential Requirements:
US Citizenship is required.
Clearance: TS/SCI
In compliance with Colorado's Equal Pay for Equal Work Act, the annual base salary range for this position is listed . Please note that the salary information is a general guideline only. I2X Technologies considers factors such as (but not limited to) scope and responsibilities of the position, candidate's work experience, education/training, key skills, internal peer equity, as well as, market and business considerations when extending an offer.
Physical Demands:
The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job with or without reasonable accommodation.
While performing the duties of this job, the employee will regularly sit, walk, stand and climb stairs and steps. May require walking long distance from parking to work station. Occasionally, movement that requires twisting at the neck and/or trunk more than the average person, squatting/ stooping/kneeling, reaching above the head, and forward motion will be required. The employee will continuously be required to repeat the same hand, arm, or finger motion many times. Manual and finger dexterity are essential to this position. Specific vision abilities required by this job include close, distance, depth perception and telling differences among colors. The employee must be able to communicate through speech with clients and public. Hearing requirements include conversation in both quiet and noisy environments. Lifting may require floor to waist, waist to shoulder, or shoulder to overhead movement of up to 20 pounds. This position demands tolerance for various levels of mental stress.
I2X Technologies is an Engineering and Information Technology Company focused on providing Services to the Federal and State Government. I2X offers a competitive compensation program and comprehensive benefits package to our employees.

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