Freelance Java Backend Developer Jobs in Belleville, IL

Job Description

At Boeing, we innovate and collaborate to make the world a better place. We’re committed to fostering an environment for every teammate that’s welcoming, respectful and inclusive, with great opportunity for professional growth. Find your future with us.

The Boeing Company is currently seeking BackEnd Software Engineer (Experienced or Senior) to lead our Model-Based Engineering (MBE) software team located in Berkeley, Missouri. This position will focus on supporting the Boeing Defense Services (BDS) business organization.

Our teams are currently hiring for a broad range of experience levels including; Experienced or Senior Backend Software Engineers.

This role focuses on building prototypes and new capabilities for web applications and services. You will design APIs, develop data-processing and analytics pipelines, optimize SQL queries, and help establish production-ready infrastructure. As a backend developer, you’ll play a key role in shaping the architecture needed to take prototypes and minimum viable products into production.

Responsibilities may include researching and selecting technologies and programming languages, building reliable and high-performance server applications, and helping ensure our systems can scale to support hundreds or even thousands of users. For the right candidate, this role may also grow into a full-stack position with frontend development opportunities.

Join Us. Build the Future.

Position Responsibilities:

• Leads architecture, development, documentation and maintenance of standardized, efficient, and innovative processes, tools, methodologies, and performance metrics to streamline the software engineering lifecycle and enable continuous integration, delivery, and deployment of safety critical software

• Provide comprehensive technical oversight for different systems, guiding teams in designing and operating production-ready systems

• Evaluate emerging technologies and seek innovative solutions to address existing and new challenges

• Mentor and develop engineers across all levels through sharing and learning

• Ability to take projects from beginning to end with little direct supervision

• Teamwork and coordination skills with ability to create clarity from ambiguity

• Work with a team to shape the architecture of several web applications

• Build new and expand on existing infrastructure for multi-application communications, logging, alerts, authentication, configuration, and more

• Create test-suites for server applications to verify reliability, performance, and behavior

• Work collaboratively to make decisions that affect the entire system

• Interface with users and developers to define and implement solutions to meet requirements

• Work independently and with a team to prototype features and applications

• Communicate effectively to push the team’s processes to best fit our needs

• Engage in architectural discussions, influence the roadmap, and take ownership of key projects and initiatives

• Resolving complex technical issues and driving innovations that improve system availability, resilience, and performance

• Research and oversees implementation of current and emerging technologies, tools, frameworks and changes in regulations relevant to software development

• Oversee the architecture, design, development, analyses, and maintenance of large-scale software systems that meet industry, customer and quality

• Partners with appropriate stakeholders to inform system definition and oversees translation of system-level requirements into software requirements and models that meet customer, operational and performance requirements and have clear traceability to design, code and test artifacts

• Oversees code reviews to ensure alignment to requirements and standards

Basic Qualifications (Required Skills/ Experience):

• Bachelor’s Degree

• Active U.S. Secret Security Clearance

• Ability to obtain Special Program Access

• 5+ years of experience in backend software development (Java, Spring, Oracle SQL, SQL Server)

• 5+ years of experience with Go, Python, Java or equivalent server language

• 5+ years of experience with database technologies using SQL or PL/SQL

• Knowledge and understanding of Agile development processes

Preferred Qualifications (Desired Skills/Experience):

• 9 or more years’ related work experience or an equivalent combination of education and experience

• Experienced Level: Bachelor of Science degree from an accredited course of study in engineering, engineering technology (includes manufacturing engineering technology), chemistry, physics, mathematics, data science, or computer science and 5+ years of related work experience OR Bachelor’s Degree and 9+ years of directly related work experience OR 13+ years of related, relevant experience

• Senior Level: Bachelor of Science degree from an accredited course of study in engineering, engineering technology (includes manufacturing engineering technology), chemistry, physics, mathematics, data science, or computer science and 9+ years of related work experience OR Bachelor’s Degree and 13+ years of directly related work experience OR 17+ years of related, relevant experience

• Active Top Secret U.S. Security Clearance

• 5+ years of experience in infrastructure development

• Experience with concurrency programming

• Experience with GitLab, CI/CD, Docker, Kubernetes

• Strong experience with JavaScript frameworks: NodeJS, ReactJS

• Strong experience with Go or Java

• Basic C++ or Python

• Familiar with Kafka, NiFi, Redis, or RabbitMQ

• Experience developing RESTful APIs for complex datasets

• Experience leading projects

• Experience with AWS cloud

• Understanding microservices, client-server architecture, event-driven architecture, domain-driven design (DDD), and other modern architectural styles to build robust and adaptable systems

• Experience in large-scale software system architecture, design, and development of distributed/on-premises end-to-end scalable software

Travel:

Up to 10%

Drug Free Workplace:

Boeing is a Drug Free Workplace (DFW) where post offer applicants and employees are subject to testing for marijuana, cocaine, opioids, amphetamines, PCP, and alcohol when criteria is met as outlined in our policies.

Conflict of Interest:

Successful candidates for this job must satisfy the Company’s Conflict of Interest (COI) assessment process.

Relocation:  

This position offers relocation based on candidate eligibility. Note: Basic relocation will be offered for eligible internal candidates. 

CodeVue Coding Challenge:

To be considered for this position you will be required to complete a technical assessment as part of the selection process.  Failure to complete the assessment will remove you from consideration.

Pay & Benefits:

At Boeing, we strive to deliver a Total Rewards package that will attract, engage and retain the top talent.  Elements of the Total Rewards package include competitive base pay and variable compensation opportunities. 

The Boeing Company also provides eligible employees with an opportunity to enroll in a variety of benefit programs, generally including health insurance, flexible spending accounts, health savings accounts, retirement savings plans, life and disability insurance programs, and a number of programs that provide for both paid and unpaid time away from work. 

The specific programs and options available to any given employee may vary depending on eligibility factors such as geographic location, date of hire, and the applicability of collective bargaining agreements.  

Pay is based upon candidate experience and qualifications, as well as market and business considerations. 

Summary Pay Range Experienced Level: $126,650 - $171,350

Summary Pay Range Senior Level: $160,650 - $217,350

Potential signing bonus for eligible/qualified external candidates.

Applications for this position will be accepted until Aug. 28, 2026

Export Control Requirements:

This position must meet U.S. export control compliance requirements. To meet U.S. export control compliance requirements, a “U.S. Person” as defined by 22 C.F.R. §120.62 is required. “U.S. Person” includes U.S. Citizen, U.S. National, lawful permanent resident, refugee, or asylee.

Export Control Details:

US based job, US Person required

Education

Bachelor's Degree or Equivalent Required

Relocation

This position offers relocation based on candidate eligibility.

Security Clearance

This position requires an active U.S. Secret Security Clearance (U.S. Citizenship Required). (A U.S. Security Clearance that has been active in the past 24 months is considered active)

Visa Sponsorship

Employer will not sponsor applicants for employment visa status.

Shift

This position is for 1st shift

Equal Opportunity Employer:

Boeing is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, national origin, gender, sexual orientation, gender identity, age, physical or mental disability, genetic factors, military/veteran status or other characteristics protected by law.