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Mid Level Developer Jobs in Saint Louis, MO (NOW HIRING)

Mid-Level Test Engineer

Granite City, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Glen Carbon, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Columbia, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Wood River, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Bridgeton, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Edwardsville, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Saint Louis, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Dupo, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Saint Louis, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Venice, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Saint Louis, MO · On-site

$87K - $157K/yr

Leidos is seeking an experienced Mid-Level Test Engineer to join the Chinook Program supporting an ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

South Roxana, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Saint Ann, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Ballwin, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Earth City, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Hartford, IL · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Mid-Level Test Engineer

Valley Park, MO · On-site

$87K - $157K/yr

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.

Showing results 21-40

Mid Level Developer information

See Saint Louis, MO salary details

$10.7K

$84.3K

$109.9K

How much do mid level developer jobs pay per year?

As of Sep 7, 2026, the average yearly pay for mid level developer in Saint Louis, MO is $84,259.00, according to ZipRecruiter salary data. Most workers in this role earn between $58,300.00 and $104,500.00 per year, depending on experience, location, and employer.

What is a mid level developer?

Mid Level Developers are software professionals who have gained several years of experience beyond entry-level positions and are proficient in coding, debugging, and collaborating on projects. They possess a strong understanding of programming languages, frameworks, and software development processes. Mid Level Developers often take on more responsibility than junior developers, such as mentoring newer team members, contributing to architectural decisions, and ensuring code quality. They are expected to work independently on tasks, communicate effectively with team members, and deliver reliable solutions to complex problems.

What are the key skills and qualifications needed to thrive as a mid level developer?

To thrive as a Mid Level Developer, you need solid programming skills in languages such as Java, Python, or JavaScript, along with a relevant degree or equivalent experience. Familiarity with version control systems like Git, integrated development environments (IDEs), and frameworks such as React or Spring Boot is typically required. Effective problem-solving, teamwork, and strong communication skills help you collaborate and adapt to project needs. These abilities ensure you can deliver reliable code, work smoothly with colleagues, and contribute to successful software projects.

What opportunities for professional growth can a mid level developer typically expect within a software development team?

As a Mid Level Developer, you can expect to take on more complex projects, mentor junior team members, and gradually assume greater ownership of features or modules. Many organizations support growth through peer code reviews, access to learning resources, and the chance to participate in architectural discussions. Advancement paths often include moving toward senior developer roles, technical leads, or specializing in areas like DevOps or security, depending on your interests and the company's needs.

What is the difference between Mid Level Developer vs Junior Developer?

AspectMid Level DeveloperJunior Developer
Experience2-4 years0-2 years
SkillsProficient in multiple programming languages, problem-solving, and project contributionBasic coding skills, learning foundational concepts
ResponsibilitiesDeveloping features, debugging, collaborating on projectsAssisting in tasks, learning codebases, under supervision
Work EnvironmentIndependent work, team collaboration, project ownership

The main difference between a Mid Level Developer and a Junior Developer lies in experience, skill proficiency, and responsibilities. Mid Level Developers have more experience, can handle complex tasks independently, and contribute significantly to projects, whereas Junior Developers are still learning foundational skills and typically work under supervision.

What are the most commonly searched types of Developer jobs in Saint Louis, MO?

The most popular types of Developer jobs in Saint Louis, MO are:

What are popular job titles related to Mid Level Developer jobs in Saint Louis, MO?

For Mid Level Developer jobs in Saint Louis, MO, the most frequently searched job titles are:

What job categories do people searching Mid Level Developer jobs in Saint Louis, MO look for?

The top searched job categories for Mid Level Developer jobs in Saint Louis, MO are:

What cities near Saint Louis, MO are hiring for Mid Level Developer jobs?

Cities near Saint Louis, MO with the most Mid Level Developer job openings:

Infographic showing various Mid Level Developer job openings in Saint Louis, MO as of August 2026, with employment types broken down into 1% As Needed, 75% Full Time, 16% Part Time, and 8% Contract. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution, with an average salary of $84,259 per year, or $40.5 per hour.

$125 - $150/hr

Other

Medical, Dental, Vision, Life, Retirement, PTO

Posted 8 days ago


Key responsibilities

  • Lead and oversee Phase I ESAs, Phase II ESAs, permitting, CERCLA/RCRA investigations, remedial design, environmental remediation, and environmental compliance inspections.

  • Develop work plans, health and safety plans, field sampling plans, and sampling and analysis plans.

  • Perform sampling of soil, groundwater, surface water, sediment, soil vapor, and air, and oversee remediation projects.


Job description

Headquartered in St. Louis, Missouri, Professional Environmental Engineers, Inc. (PE) is a full-service environmental engineering and consulting small business that specializes in providing cost-effective environmental solutions for both government and commercial clientele. PE is seeking a dynamic, ambitious, and versatile Environmental Engineer, Geologist, or Scientist to work out of our St Louis office that desires a variety of tasks, enjoys a fast-paced environment, likes new challenges and wants to grow, and is a team player. This role blends technical expertise with project management, ensuring compliance with client requirements and regulatory guidelines. The ideal candidate will have considerable experience managing and executing environmental projects with complex soil, groundwater, and other media, as well as maintain a history of providing on-time, on-budget delivery of services and deliverables.

RESPONSIBILITIES
  • Lead and oversee Phase I ESAs and related due diligence projects, as well as Phase II ESAs, permitting, CERCLA/RCRA investigations, remedial design, environmental remediation, and environmental compliance inspections through monitoring and maintaining project schedules and budgets, evaluating project productivity and quality, and directing the complete technical operations of the project.
  • Develop work plans, health and safety plans, field sampling plans, and sampling and analysis plans.
  • Prepare soil boring logs, cross-sections, contour maps, well schematics, and site maps.
  • Perform sampling of soil, groundwater, surface water, sediment, soil vapor, and air and other field related tasks.
  • Perform oversight of remediation projects.
  • Prepare highly technical reports, tables, spreadsheets, and maps for client and regulatory agency review.
MINIMUM REQUIREMENTS
  • Bachelor’s degree in engineering (environmental, civil, or chemical) or science (earth and planetary sciences, soil science, geophysics, hydrogeology, environmental geology, biology, or chemistry) with an environmental emphasis.
  • At least 10 years of total experience and 5 years of Project Management experience
  • Knowledge of geologic principles and local geologic framework, including the ability to independently identify local soil types using USCS or equivalent soil classification system and correlate site geology to regional geologic framework.
  • Knowledge of environmental regulatory programs including but not limited to federal programs such as CERCLA, RCRA, and NEPA and state regulations such as Missouri Risk Based Corrective Action (MRBCA), Kansas Risk Based Standards, and the Illinois Site Remediation Program (SRP).
  • Strong communication and interpersonal skills to provide effective intra and inter-discipline coordination on projects, as well as effective communication with clients and vendors.
  • Must be organized, self-directed, able to prioritize and multi-task, work in a team environment and take direction from others and have the ability/desire to lead tasks.
  • Proficient in computer software programs, particularly MS Word, Excel, PowerPoint, and Adobe Acrobat.
  • Ability to lift and carry up to 40 lbs occasionally.
  • A valid driver’s license and the ability to travel (less than 25%).
  • OSHA 40-hr HAZWOPER/Current 8-hr Refresher.
  • Professional Engineer or Registered/Professional Geologist licensure
  • Project Management Professional certification
  • ASTM Phase I ESA Training
  • Experience with Stormwater Pollution Prevention Plan (SWPPP) Inspections and developing Spill Prevention Control Countermeasure (SPCC) Plans.
  • NEPA experience
BENEFITS

PE offers competitive wages and comprehensive benefits including medical, dental, vision, paid time off, 401(k), life, disability, and professional development.

Posting Notices

PE is an equal opportunity and affirmative action employer.

PE is committed to providing reasonable accommodations to qualified individuals with disabilities upon request.

PE has a Drug-Free Workplace Policy and requires all job applicants to take a drug test prior to hire. An applicant who fails the drug test will not be hired.

To ensure the employee can perform his or her duties safely, a physical examination will be required after an offer of employment. Employment will be conditional based on the job-related results of the examination. This examination is required only because the employee’s safety requires the examination.

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