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Trainee Junior Javascript Developer Jobs in Missouri

Leidos

Entry Level Software Developer

Saint Louis, MO · On-site

$57K - $104K/yr

The Leidos Maritime ASET team has an opening for a junior (entry level) software developer to work ... Applicant must possess competence with Python and JavaScript/TypeScript. Other duties include ...

Chenega Corporation

ServiceNow Developer

Saint Louis, MO

$52.50 - $72/hr

The Senior ServiceNow Developer will mentor junior developers, collaborate across engineering teams ... CSS * JavaScript * Agile development practices * 3+ years of experience in ITSM development

Chenega MIOS

ServiceNow Developer

Saint Louis, MO · On-site

$51.25 - $70.50/hr

The Senior ServiceNow Developer will mentor junior developers, collaborate across engineering teams ... CSS * JavaScript * Agile development practices * 3+ years of experience in ITSM development

Meridian Systematics

Cloud Engineer

Saint Louis, MO · On-site

$110K - $136K/yr

... * DevOps & Automation: Automate service deployments, build CI/CD pipelines, and support ... JavaScript, TypeScript, Angular, Microservices architecture, REST API integration, Relational ...

Meridian Systematics

Cloud Engineer

Saint Louis, MO · On-site

$150 - $200/hr

... * DevOps & Automation: Automate service deployments, build CI/CD pipelines, and support ... JavaScript, TypeScript, Angular, Microservices architecture, REST API integration, Relational ...

Next Level Solutions

Senior Solutions Engineer

Springfield, MO · On-site

$47 - $60.75/hr

... Junior Engineers, participate in code reviews, and help teammates work through technical challenges. Your technical toolkit may include C#, .NET, SQL, APIs, JavaScript/Angular, Azure , and other ...

Phoenix Court Group

Senior DevOps Engineer

California, MO · On-site

$150 - $200/hr

Mentor and guide junior team members, sharing DevOps best practices and fostering a culture of ... Experience with PHP, Javascript, GoLang. * Extra: Experience provisioning servers and services ...

CACI

Full Stack Developer

Saint Louis, MO · On-site

$90K - $189K/yr

... using JavaScript or TypeScript. Architecture: Contribute to the overall system architecture ... Provide technical leadership and guidance to junior developers through code reviews and best ...

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Trainee Junior Javascript Developer information

What does a trainee junior JavaScript developer do?

A Trainee Junior Javascript Developer is an entry-level professional who assists in building and maintaining web applications using JavaScript. They typically work under the guidance of more experienced developers, learning to write clean code, debug simple issues, and use frameworks like React or Node.js. This role is designed to help individuals develop foundational programming skills and gain practical experience in real-world software development projects.

What types of projects can a trainee junior JavaScript developer expect to work on during their first year?

As a Trainee Junior Javascript Developer, you will typically start by assisting with smaller tasks such as bug fixes, writing unit tests, or implementing basic features under the guidance of senior developers. Over time, you'll gain exposure to collaborative projects like developing user interfaces, integrating APIs, or maintaining front-end codebases using frameworks such as React or Vue.js. These projects help you build technical skills while learning best practices in code review, version control, and agile workflows. Regular mentorship and code feedback are common, fostering rapid professional growth in a supportive team environment.

What are the key skills and qualifications needed to thrive as a trainee junior JavaScript developer, and why are they important?

To thrive as a Trainee Junior Javascript Developer, you need a solid understanding of JavaScript fundamentals, HTML, CSS, and a relevant degree or coding bootcamp experience. Familiarity with version control systems like Git, basic knowledge of frameworks such as React or Node.js, and exposure to development environments are typically required. Strong problem-solving skills, eagerness to learn, and effective communication set candidates apart in this role. These skills and qualities are crucial for adapting to fast-paced development teams and building a foundation for future growth in software engineering.

What is the difference between Trainee Junior Javascript Developer vs Junior Web Developer?

AspectTrainee Junior Javascript DeveloperJunior Web Developer
Required CredentialsBasic coding knowledge, often in training or bootcampSome experience or formal education in web development
Work EnvironmentInternship or entry-level training programFull-time role in a development team
Employer UsageTraining programs, startups, or companies hiring entry-levelEstablished companies, agencies, or startups

In summary, a Trainee Junior Javascript Developer is typically in training or an internship, focusing on learning JavaScript basics, while a Junior Web Developer has more experience and handles broader web development tasks. Both roles serve as entry points but differ in experience level and responsibilities.

What are popular job titles related to Trainee Junior Javascript Developer jobs in Missouri?

For Trainee Junior Javascript Developer jobs in Missouri, the most frequently searched job titles are:

What job categories do people searching Trainee Junior Javascript Developer jobs in Missouri look for?

The top searched job categories for Trainee Junior Javascript Developer jobs in Missouri are:

What cities in Missouri are hiring for Trainee Junior Javascript Developer jobs?

Cities in Missouri with the most Trainee Junior Javascript Developer job openings:

Trainee Junior Javascript Developer jobs near you
Infographic showing various Trainee Junior Javascript Developer job openings in Missouri as of July 2026, with employment types broken down into 85% Full Time, 3% Part Time, 1% Temporary, and 11% Contract. Highlights an 82% Physical, 3% Hybrid, and 15% Remote job distribution.

Entry Level Software Developer

Saint Louis, MO • On-site

Leidos
IT Services • 10K+ employees
Learn more about Leidosexternal

$57K - $104K/yr

Full-time

Re-posted 20 hours ago

Leidos rating

8.3

Company rating: 8.3 out of 10

Based on 153 frontline employees who took The Breakroom Quiz

81st of 500 rated business services

Job description

The Leidos Maritime ASET team has an opening for a junior (entry level) software developer to work on the design and coding with software solutions for 6 month - temporary to permanent hire position. The ideal candidate has a familiarity with and a baseline understanding of software development concepts, developing coding skills using different tools, and ambition towards future projects in support of the mission.
Primary Responsibilities
  • Applicant must possess competence with Python and JavaScript/TypeScript. Other duties include working with Docker, AWS Cloud, and familiarity with JSON APIs.
  • This role includes creation and documentation of new and existing functionality within software version control repositories (GitLab) and utilizing DevOps principals and tools to deliver new features within an Agile construct.
  • Participate in program Agile software development initiatives (standup, planning, Increment planning) to support innovation and enhancement of custom applications through iteration/functionality testing.
  • Primary responsibilities will involve developing configurations and features for processing Safety of Navigation (SoN) data through an Optical Character Recognition (OCR), Machine Learning (ML) application.
  • This role includes API development and database integration for interaction with React frameworks, using various open-source packages for visualization and data filtering and code modifications that shall apply best practices in unit and build testing.
  • Participate and collaborate with team members to assess tickets to ensure proper testing and delivery of functionality per User Story Acceptance Criteria.

Basic Qualifications
  • Requires bachelors degree and 0+ years of prior relevant experience.
  • 0+ years of experience with Python.
  • 0+ years of experience with modern JavaScript development framework.
  • 0+ years of experience with unit testing, continuous integration tools, and Gitlab version control.
  • Proactive self-starter demonstrates a positive, willing attitude and excellent oral and written communication skills.
  • Experience in either software development projects or software integration projects in a service-oriented environment (Cloud, SOA, Web-Services) or virtualization environment.
  • Organizational Skills: Can plan and prioritize work. Follows tasks to their logical conclusion and makes sure that everything has been done to the right standard. Good attention to detail.
  • Communications: Ability to communicate clearly and efficiently to team members and clients, verbally and in writing. Able to present ideas in a variety of ways depending upon audience and context.
  • US Citizenship required.
  • Ability to obtain and maintain a TS/SCI with Polygraph clearance.

Preferred Qualifications
  • 0+ years of experience with Optical Character Recognition (OCR) and/or Computer Vision (CV) Technologies (AWS Textract, Tesseract, OpenCV).
  • 0+ years of experience with AWS cloud formation templates and/or AWS CDK.
  • Experience with 2D data (HTML Canvas, OpenLayers, Leaflet, GeoJSON, Godot).
  • AWS Solutions or DevOps certification.
  • Team Collaboration tools (Jira, Confluence).
  • Active TS/SCI with Polygraph clearance.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.
Original Posting:
July 9, 2026
For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
Pay Range:
Pay Range $57,850.00 - $104,575.00
The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

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About Leidos

Sourced by ZipRecruiter

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. We empower our teams, contribute to our communities, and operate sustainable practices. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community.

Industry

It services

Company size

10,000+ Employees

Headquarters location

Reston, VA, US

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