Web Developer Internship Jobs in O Fallon, MO (NOW HIRING)

Job Title: Junior Application Developer Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Continental US Anticipated Posting End: 12/31/2026 The Opportunity: Launch your development career on a fast-paced Agile team building GEOINT applications for the National Geospatial-Intelligence Agency (NGA). Contribute to modern web-based software that directly supports national security missions. Gain hands-on experience with GIS technologies, cloud-native architectures, and large-scale data environments.

Learn from experienced developers and architects invested in growing your skills. Responsibilities: Develop, test, and maintain application features under the guidance of senior developers. Implement web application functionality using Java and/or Python and modern frameworks.

Support integration of application components with APIs, services, and databases. Assist with GIS-enabled feature development and geospatial service enhancements. Participate in code reviews, unit testing, debugging, and documentation.

Apply secure coding practices and follow established engineering standards. Contribute within sprint cycles as part of a cross-functional Agile team. Qualifications: Required: Bachelor's degree in Computer Science, Software Engineering, or a related technical discipline (equivalent experience accepted).

0-3 years of professional software development experience. Experience developing software using Java, Python, or both (academic, internship, or professional). Familiarity with web application development concepts and technologies.

Understanding of relational databases and basic data modeling principles. Strong problem-solving skills and ability to work effectively within a team. Security Clearance (TS/SCI) with willingness to undergo polygraph examination.

Desired: Exposure to GIS technologies (ArcGIS, GeoServer, OpenLayers, Cesium, or similar). Familiarity with Git, CI/CD, or containerization tools. Coursework or projects involving Agile development practices.

Experience using geospatial software such as Esri ArcGIS Pro / ArcGIS Enterprise and related APIs. - What You Can Expect: A culture of integrity. At CACI, we place character and innovation at the center of everything we do.

As a valued team member, you'll be part of a high-performing group dedicated to our customer's missions and driven by a higher purpose - to ensure the safety of our nation. An environment of trust. CACI values the unique contributions that every employee brings to our company and our customers - every day.

You'll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality. A focus on continuous growth. Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground - in your career and in our legacy.

Pay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities.

Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits. Since this position can be worked in more than one location, the range shown is the national average for the position.

The proposed salary range for this position is: $53,100-$106,300 CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.