Software Engineer (TS/SCI with Poly Required)

GCI, Inc.; Chantilly (VA); On-site; USD 143,000 - 238,000; Full time

Job summary

GCI, Inc. is seeking a Software Engineer (TS/SCI with Poly Required) in Chantilly, VA. You will design, develop and deploy cloud-based software in a mission-critical environment, with emphasis on OpenSearch, data ingestion, and AWS services.

The role requires hands-on development, collaboration with data scientists and engineers, and a focus on scalable, robust software in an agile setting. A TS/SCI with Poly clearance and US citizenship are required.

Qualifications

• Bachelor's degree in Computer Science or related technical discipline.
• 10 years of related experience or equivalent.

Responsibilities

• Design, develop, test, and debug software in a mission-critical environment.
• Build cloud-based applications and tools; propose new technologies to improve performance.
• Collaborate with data scientists, analysts, PMs and engineers across teams.
• Deploy software into an AWS-based data ingest pipeline and manage data in S3.
• Drive OpenSearch data-layer design, indexing strategies and query optimization.
• Troubleshoot complex issues and maintain thorough documentation.
• Support continuous improvement and cross-functional collaboration.

Skills

Python

REST APIs

OpenSearch

AWS CDK

Terraform

OOP design

AWS EC2

AWS S3

AWS IAM

AWS VPC

Unit testing

Education

Bachelor's degree in Computer Science

Tools

Git

Job description

Software Engineer (TS/SCI with Poly Required)

Job Category: Software Engineering

Requisition Number: SOFTW002287

• Posted : September 2, 2026
• Full-Time
• On-site
• Salary Range : $142,792 USD to $238,451.20 USD

Locations

Showing 1 location

Chantilly
Chantilly, VA, USA

Description

GCI embodies excellence, integrity and professionalism. The employees supporting our customers deliver unique, high-value mission solutions while effectively leverage the technological expertise of our valued workforce to meet critical mission requirements in the areas of Data Analytics and Software Development, Engineering, Targeting and Analysis, Operations, Training, and Cyber Operations. We maximize opportunities for success by building and maintaining trusted and reliable partnerships with our customers and industry.

At GCI, we solve the hard problems. As a Software Engineer, a typical day will include the following duties:

The Software Engineer will design, develop, code, test, and debug complex software products to be deployed in a mission critical environment. The ideal candidate is a hands-on developer with significant experience in scalable data platforms, cloud-based services, and big data analytics, and OpenSearch or Elasticsearch. They must have strong, firsthand technical expertise in a variety of data ingestion/computation technologies and the proven ability to fashion robust scalable solutions that can manage large data sets. They must be at ease working in an agile environment with a cross-functional team. This person should embody a passion for innovation and continuous improvement.

KEY RESPONSIBILITIES

• Work with a team to write new cloud-based applications and tools and recommend new technologies and methodologies to improve system performance and usability.
• Design, develop, test, debug, and deploy new software tools that extend or replace existing capabilities to parse raw data for analysis.
• Collaborate cross-functionally with data scientists, analysts, project managers and other engineers and technical SMEs.
• Deploy new software into an AWS-based data ingest pipeline.
• Write software that interacts with multiple data types and stores data into S3 buckets that is queried by processes running Athena or OpenSearch.
• As an OpenSearch expert, drive the design of indexing strategies, query optimizations, and maintain overall architectural ownership of the OpenSearch data layer.
• Troubleshoot complex problems and provide support to mission areas for software systems and application issues.
• Maintain good documentation for new software written and new procedures to be followed.
• Provide recommendations for continuous improvement.
• Work alongside other engineers on the team to sustain and advance our organization’s capabilities.

EDUCATION AND EXPERIENCE

• Bachelor's degree in Computer Science, Information Technology, or other related technical discipline, or equivalent combination of education, technical certifications, training, and work/military experience.

DESIRED QUALIFICATIONS

• Demonstrated hands-on experience with Python, Git, and unit testing frameworks.
• Demonstrated hands-on experience with building APIs and services using REST.
• Demonstrated hands-on experience with OpenSearch or Elasticsearch.
• Demonstrated hands-on experience with AWS CDK 1 and/or 2 or Terraform.
• Demonstrated hands-on experience applying object-oriented design principles and patterns to architect scalable, maintainable, and testable software systems in production environments.
• Demonstrated hands-on experience designing and developing applications using core AWS services, including EC2, S3, IAM, and VPC

*A candidate must be a US Citizen and requires an active/current TS/SCI with Polygraph clearance.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

Qualifications

Education

Preferred

Bachelor of Science or better in Computer Science or related field.

Experience

Required

10 years:

Demonstrated work related experience.

Equal Opportunity Employer
This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights notice from the Department of Labor.