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Freelance Backend Web Developer Jobs in Wisconsin

LRS

Software Developer - .NET

Milwaukee, WI

$60 - $80/hr

NET Backend Engineer to support the design, modernization, and ongoing improvement of enterprise ... backend systems Strong experience with .NET technologies and building or consuming web services ...

VIVA USA INC

Java Developer

Madison, WI · On-site +1

$51.50 - $66.50/hr

Develop and maintain Java-based backend applications, ensuring high performance and scalability ... web applications development, web services, REST api and etc - 3+ years in Messaging Queues and ...

Resource Point LLC

Java Developer

Madison, WI · On-site

$51.50 - $66.50/hr

... * 5+ years in web applications development, web services, REST API and etc,. * 3+ years in ... Develop and maintain Java-based backend applications, ensuring high performance and scalability.

Zfinity Global

Java Developer -III

Madison, WI · On-site

$51.50 - $66.50/hr

Key Responsibilities: · Develop and maintain Java-based backend applications, ensuring high ... · 5+ years in web applications development, web services, REST api and etc · 3+ years in ...

New

Technoviz LLC

Java Developer III

Madison, WI · On-site

$55/hr

Key Responsibilities: · Develop and maintain Java-based backend applications, ensuring high ... web applications development, web services, REST api and etc - 3+ years in Messaging Queues and ...

New

Digitek Software, Inc.

Java developer

Madison, WI · On-site

$51.50 - $66.50/hr

... web applications development, web services, REST api and etc - 3+ years in Messaging Queues and ... Key Responsibilities: · Develop and maintain Java-based backend applications, ensuring high ...

ETC

IT Developer - Mobile Apps

Middleton, WI · On-site

... back-end data sources, cloud, and RESTful web service APIs • Work with product and design teams ... Bootstrap, Material Design, etc. • SQL database design and programming • Source code control ...

IO Datasphere

Java Developer

Madison, WI · On-site

$51.50 - $66.50/hr

Tasks · Develop and maintain Java-based backend applications, ensuring high performance and ... web applications development, web services, REST API and etc. · 3+ years - Experience with ...

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Freelance Backend Web Developer information

What is a Freelance Backend Web Developer?

A Freelance Backend Web Developer is a self-employed professional who specializes in building and maintaining the server-side logic, databases, and APIs that power web applications. Unlike front-end developers who focus on the visual and interactive aspects of a website, backend developers work behind the scenes to ensure websites and applications function correctly and efficiently. Freelance backend developers typically work on a project basis for various clients, managing their own schedules and business operations. They often use programming languages like Python, Java, Ruby, PHP, or Node.js, and are responsible for tasks such as database management, server configuration, and integrating third-party services.

What are some common challenges freelance backend web developers face when working with multiple clients simultaneously?

Freelance backend web developers often juggle projects for several clients at once, which can present challenges in managing deadlines, aligning with different technical stacks, and maintaining clear communication. Each client may use unique frameworks or have distinct workflow expectations, requiring adaptability and strong organizational skills. Effective time management and clear documentation help ensure smooth collaboration and prevent misunderstandings throughout the development process.

What are the key skills and qualifications needed to thrive as a Freelance Backend Web Developer, and why are they important?

To thrive as a Freelance Backend Web Developer, you need strong proficiency in server-side programming languages (such as Python, Node.js, or PHP), database management, and a solid understanding of web architecture, often supported by a relevant degree or proven project experience. Familiarity with frameworks (like Django, Express, or Laravel), version control systems (such as Git), and cloud platforms (AWS, Azure) is typically required. Excellent problem-solving, time management, and client communication skills set successful freelancers apart in this competitive field. These skills ensure you can deliver robust, scalable solutions, meet client expectations, and efficiently manage independent projects.
What are the most commonly searched types of Backend Web Developer jobs in Wisconsin? The most popular types of Backend Web Developer jobs in Wisconsin are:
Freelance Backend Web Developer jobs near you
Full Stack Developer (Angular/NodeJS) - II

Full Stack Developer (Angular/NodeJS) - II

Syms Strategic Group, LLC (SSG)

La Crosse, WI • On-site

$85K - $116K/yr

Full-time

Posted 7 days ago

New

Job description

Syms Strategic Group (SSG) is seeking a talented Full Stack Developer (Angular/NodeJS) - II
Location: Remote
Department: Veterans Affairs (VA)
Type: Full Time
Min. Experience: Experienced
Security Clearance Level: Public Trust
Salary Range: $85,389 - $116,975
Military Veterans are highly encouraged to apply!
Essential Duties and Responsibilities
  • Build, support, and migrate a cloud-based Web Dashboard application that processes healthcare Electronic Data Interchange (EDI) transactions
  • Design, build, and maintain Representational State Transfer Application Programming Interfaces (RESTful APIs) in Java and/or NodeJS that retrieve, transform, and serve EDI healthcare records
  • Integrate with internal platform APIs, EDI processing pipelines, and data services to deliver live and historical EDI transaction data reliably and performantly
  • Support and contribute to an Angular-based dashboard front-end - consuming APIs, building or maintaining components, and ensuring data is surfaced accurately to business and clinical users
  • Collaborate with back-end C#/.Net and AWS data engineers to define clean API contracts and ensure reliable data delivery across services
  • Write clean, testable, well-documented code and participate actively in code review
  • Perform unit and integration testing across back-end services and API layers
  • Support deployment, monitoring, and performance of back-end services in production on AWS
  • Apply and promote best software engineering practices within an Agile framework
  • Use Git and GitHub for version control, branching, pull requests, and collaborative development
Required Skills and Experience
  • Experience with Java and/or NodeJS back-end integration work and Angular front-end User Interface (UI)
  • An understanding of structured healthcare data
  • Proven experience building back-end services that serve structured EDI or healthcare data to front-end application
  • Hands-on Angular experience with the ability to integrate APIs and contribute to front-end components
  • Strong back-end development experience in Java and JavaScript/TypeScript/NodeJS - API design, data transformation, error handling, and performance
  • Experience with Angular or another Modern front-end framework
  • Proven ability to build RESTful APIs that consume and transform structured data (XML, JSON)
  • Working knowledge of Angular, including components, services, and API integration
  • Hands-on Cloud (AWS/Azure) experience, including API Gateway, Lambda, S3, CloudWatch, or related services
  • Proficiency with Git/GitHub, including branching strategies, pull requests, and collaborative workflows
  • Experience with unit and integration testing frameworks (JUnit, Jest, or equivalent)
  • Strong communication skills and an ability to work with stakeholders and cross-functional engineers to define and refine API requirements
  • Experience with Agile methodologies (Scrum and Kanban) and JIRA
  • An ability to work independently and as part of a distributed team
  • Strong attention to detail, especially around data accuracy and fidelity for healthcare records
  • An ability to conduct code reviews and provide constructive feedback
  • U.S. Citizenship required for this position.
Professional CertificationsNone requiredYears of Professional Experience8+ years of software development experience with a strong back-end focus (Java and/or NodeJS)
8+ years of experience designing and consuming RESTful APIs in healthcare or enterprise environmentsDesired experienceElectronic Data Interchange X.12 (EDI) Medical Claims
  • X.12 medical claims (837, 834, 277, etc)
Familiarity with web document submission processes
Experience in a high paced DevOps environment
Front-end development experience
Familiarity with healthcare payer/Pharmacy Benefit Manager (PBM) systems, clearinghouses, or pharmacy operations
Knowledge of HIPAA compliance requirements in API and web applications
Familiarity with accessibility standards (Section 508/WCAG 2.1) for government-facing applications
Experience with containerization (Docker, ECS, EKS)
Familiarity with C#/.Net back-end services for cross-team integration touchpoints
Experience working with remote U.S. based teams (Not Offshore teams)Formal EducationBachelor's degree in Computer Science, Engineering, or a related technical disciplineCitizenship RequirementU.S. Citizenship required for this specific opportunitySecurity Clearance RequirementsMust possess or qualify for a Public Trust (MBI)CRITICAL NOTES:
  1. SSG will not make assumptions regarding your qualifications. Your answers to the mandatory screening questions must be supported by the information on your resume. Applications with inconsistencies will not be considered.
  2. Recruiters or Third parties will not be considered.
  3. This is a 100% U.S. based remote position. However, candidates from CA, CO, IL, MN, NJ, NY, OR, or WA will not be considered.
  4. This is a W-2 position
  5. All interviews will be conducted on Microsoft Teams with your camera on; there will be no exceptions
  6. As part of our screening process, you will be requested to provide a link to your LinkedIn profile

U.S Citizenship is required for this specific opportunity. Applicants selected will be subject to a government security investigation and must meet eligibility requirements for access to classified information and be able to obtain a government-granted security clearance. Individuals may also be subject to a background investigation including, but not limited to criminal history, employment and education verification, drug testing, and creditworthiness.
Syms Strategic Group, LLC is an Equal Opportunity Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, age, national origin, marital status, disability, veteran status, sexual orientation, or genetic information.

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