ZipRecruiter

Log In

1

Senior Javascript Engineer Jobs in Swansea, IL (NOW HIRING)

Nerdy

Senior Software Engineer

Saint Louis, MO · On-site

$114K - $151K/yr

Your focus would be on building products using Javascript and Typescript and a core Object-Oriented ... We require Senior Software Engineers with a strong focus on AI-Native development. Proficiency in ...

Worky

Senior Software Developer

O Fallon, IL · On-site

$110 - $120/hr

The DevSecOps Engineer is also responsible for driving solutions that meet the customers' technical ... Java, HTML5 technologies, Angular, Spring, RHEL, SQL, Oracle RDBMS, JavaScript, XML, Agile ...

New

ECS

Senior Software Developer

O Fallon, IL · On-site

$110K - $120K/yr

The DevSecOps Engineer is also responsible for driving solutions that meet the customers' technical ... Java, HTML5 technologies, Angular, Spring, RHEL, SQL, Oracle RDBMS, JavaScript, XML, Agile ...

Husch Blackwell Llp

Senior Software Engineer

Saint Louis, MO · On-site +1

$114K - $151K/yr

The Senior Software Engineer designs, builds, and maintains the technical systems and application ... Proficiency in one or more back-end languages (e.g., Python, Javascript, TypeScript) and ...

Husch Blackwell LLP

Senior Software Engineer

Saint Louis, MO · On-site +1

$114K - $151K/yr

The Senior Software Engineer designs, builds, and maintains the technical systems and application ... Proficiency in one or more back-end languages (e.g., Python, Javascript, TypeScript) and ...

Leidos

Senior Test Engineer

Hartford, IL · On-site

$107K - $195K/yr

As a Senior Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with scripting languages including JavaScript, and Python. * Knowledge of containerized ...

Leidos

Senior Test Engineer

Saint Louis, MO · On-site

$107K - $195K/yr

Leidos is seeking an experienced Senior Test Engineer to join the Chinook Program supporting an ... Familiarity with scripting languages including JavaScript, and Python. * Knowledge of containerized ...

Leidos

Senior Test Engineer

South Roxana, IL · On-site

$107K - $195K/yr

As a Senior Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with scripting languages including JavaScript, and Python. * Knowledge of containerized ...

Leidos

Senior Test Engineer

Wood River, IL · On-site

$107K - $195K/yr

As a Senior Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with scripting languages including JavaScript, and Python. * Knowledge of containerized ...

Leidos

Senior Test Engineer

Fairview Heights, IL · On-site

$107K - $195K/yr

As a Senior Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with scripting languages including JavaScript, and Python. * Knowledge of containerized ...

Leidos

Senior Test Engineer

Saint Ann, MO · On-site

$107K - $195K/yr

As a Senior Test Engineer, you will play a key role in ensuring the delivery of reliable, secure ... Familiarity with scripting languages including JavaScript, and Python. * Knowledge of containerized ...

next page

Showing results 1-20

All JobsJavascript Engineer JobsSenior Javascript Engineer JobsSenior Javascript Engineer Jobs in Swansea, IL

Senior Javascript Engineer information

See Swansea, IL salary details

$121.4K

$162.8K

$185.5K

How much do senior javascript engineer jobs pay per year?

As of Aug 20, 2026, the average yearly pay for senior javascript engineer in Swansea, IL is $162,771.00, according to ZipRecruiter salary data. Most workers in this role earn between $151,500.00 and $175,300.00 per year, depending on experience, location, and employer.

What does a senior JavaScript engineer do?

A Senior JavaScript Engineer is responsible for designing, developing, and maintaining complex web applications using JavaScript and related technologies. They often lead development teams, make architectural decisions, and ensure best coding practices are followed. In addition to writing code, they may mentor junior developers, review code for quality, and collaborate with cross-functional teams to deliver high-quality software solutions.

What are the key skills and qualifications needed to thrive as a senior JavaScript engineer?

To thrive as a Senior Javascript Engineer, you need deep expertise in JavaScript, modern front-end frameworks (like React or Angular), and a solid grasp of software engineering principles, typically supported by a degree in computer science or equivalent experience. Familiarity with build tools (Webpack, Babel), version control systems (Git), and automated testing frameworks is crucial for efficient development. Strong problem-solving skills, effective communication, and leadership abilities help you mentor team members and collaborate on complex projects. These skills are vital for delivering high-quality, scalable applications and driving innovation within development teams.

What are some common challenges faced by senior JavaScript engineers when leading projects with cross-functional teams?

Senior JavaScript Engineers often encounter challenges such as aligning frontend and backend development timelines, ensuring code quality across distributed teams, and effectively communicating complex technical concepts to non-technical stakeholders. Managing dependencies between various team members and integrating new technologies or frameworks can also present difficulties. Successful engineers overcome these challenges by fostering clear communication, implementing robust documentation, and promoting collaborative problem-solving within agile workflows.

What job categories do people searching Senior Javascript Engineer jobs in Swansea, IL look for?

The top searched job categories for Senior Javascript Engineer jobs in Swansea, IL are:

What cities near Swansea, IL are hiring for Senior Javascript Engineer jobs?

Cities near Swansea, IL with the most Senior Javascript Engineer job openings:

Senior Javascript Engineer jobs near you

Senior Software Engineer 622

Freedom Technology Solutions Group

Saint Louis, MO • Remote

$119K - $157K/yr

Full-time

Re-posted 27 days ago

Job description

Freedom Technology Solutions Group is seeking a Software Developer to support our client's intelligence analysis products and capabilities. This position involves providing software development capabilities to enhance existing and emerging client capabilities, including design and development, modernization of existing applications and services, and operations and sustainment. The role focuses on driving the client's adaptation of higher levels of automation and operational efficiency through agile development methodologies, rapid prototyping, and modern technology stacks. 

The Senior Software Developer provides comprehensive knowledge across multiple backend and cloud technologies, leading major assignments and guiding project outcomes. Functions as a technical expert and may lead teams of developers. 

Responsibilities: 

  • Lead the design, development, and deployment of enterprise-scale backend services.
  • Architect and optimize secure DevSecOps pipelines and automated testing frameworks.
  • Direct the migration, scaling, and modernization of applications in AWS environments.
  • Drive geospatial solution integration across enterprise applications.
  • Define technical standards, coding guidelines, and best practices.
  • Supervise development teams and provide technical mentorship.
  • Evaluate performance results and recommend project-wide improvements.
  • Support proposal writing, technical white papers, and client briefings. 

Key Technologies:

  • Linux
  • Java, JavaScript, Python
  • Containerization (Docker, OpenShift, Kubernetes, ...)
  • AWS Services
  • GitLab
  • Apache Spark, Glue, and other ETL processes/procedures
  • Data Types: Structured and Unstructured, Parquet, JSON, XML, etc. 

Required Qualifications:

  • Active security clearance TS/SCI (eligible for CI Poly).
  • 9-13 years of backend development experience.
  • Expert proficiency in Java, JavaScript, and/or Python.
  • Proven leadership in DevSecOps adoption and Agile/SAFe development frameworks.
  • Advanced AWS expertise, including architecture and deployment of containerized applications.
  • Deep experience with geospatial systems and enterprise integration.
  • Strong ability to plan, manage, and deliver complex technology assignments.
  • Using GitLab for code source repository and using GitLab CI/CD
  • Developing customized code, scripts, modules, macro procedures, or libraries for specialized spatial analysis functions using languages such as Python, Java, JavaScript, PHP, C, C++, C#, Perl, or similar
  • Experience working independently with clients or stakeholders to develop user stories for full-service consumer and business applications 

Desired Qualifications:

  • Experience with government and/or commercial imagery products, including SAR or related RADAR imaging technologies
  • Developing geospatial information systems (GIS) and working with open-source and proprietary geospatial formats
  • Using and developing common geospatial tools, data, and operating platforms such as:
    • Tools: Boundless Spatial suite, Remote View, PostGRES/PostGIS, Oracle Spatial, ArcGIS Desktop, ArcGIS Server, Image Server, File Geodatabases
    • Data Formats: KML, KMZ, NITF, TIFF, JPEG, GeoPDF, and similar geo-related formats and data structures
  • Abstracting new or legacy systems via standards-based APIs, including Open Geospatial Consortium standards
  • Developing terrain analysis visualization and algorithms
  • Developing automated detection algorithms
  • Experience with Argo Workflows 

Apply