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Assistant Software Developer Jobs in Belleville, IL

Agile Defense

Software Engineer III

Saint Louis, MO · On-site

$56 - $75/hr

Azure DevOps Pipelines or other CI/CD tools Microservices or RESTful APIs Agile experience * Strong ... These tools assist our recruitment team but do not replace human judgment. Final hiring decisions ...

Agile Defense

Software Engineer III

Saint Louis, MO

$56 - $75/hr

Azure DevOps Pipelines or other CI/CD tools Microservices or RESTful APIs Agile experience * Strong ... These tools assist our recruitment team but do not replace human judgment. Final hiring decisions ...

Cisco

Senior Software Engineer, Backend

Clayton, MO · On-site +1

$165K - $241K/yr

Experienceutilizingautomated testing frameworks and LLM-based coding assistants within the software development lifecycle. Preferred Qualifications * Programming experience in Rust, Scala, Python.

Cisco

Software Engineer, Backend

Clayton, MO · On-site

$155K - $222K/yr

Experienceutilizingautomated testing frameworks and LLM-based coding assistants within the software development lifecycle. Preferred Qualifications * Programming experience in Rust, Scala, Python.

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All JobsSoftware Developer JobsAssistant Software Developer JobsAssistant Software Developer Jobs in Belleville, IL

Assistant Software Developer information

See Belleville, IL salary details

$28.7K

$97.4K

$234.6K

How much do assistant software developer jobs pay per year?

As of Aug 8, 2026, the average yearly pay for assistant software developer in Belleville, IL is $97,388.00, according to ZipRecruiter salary data. Most workers in this role earn between $61,700.00 and $103,000.00 per year, depending on experience, location, and employer.

What is the difference between Assistant Software Developer vs Junior Software Developer?

AspectAssistant Software DeveloperJunior Software Developer
Required CredentialsTypically an associate degree or relevant certificationsUsually an associate degree or entry-level certifications
Work EnvironmentSupportive team, learning-focused, entry-level projectsHands-on coding, developing features, debugging
Employer & Industry UsageCommon in tech companies, startups, and IT departmentsWidely used across software firms, tech startups, and IT services

The main difference is that Assistant Software Developers often focus on supporting tasks and learning, while Junior Software Developers are more involved in actual coding and project work. Both roles are entry-level, but Junior Developers typically have more hands-on responsibilities and experience.

What are the key skills and qualifications needed to thrive as an assistant software developer, and why are they important?

To thrive as an Assistant Software Developer, you need a solid understanding of programming languages (such as Java, Python, or C#), basic software development principles, and often a degree in computer science or a related field. Familiarity with version control systems like Git, integrated development environments (IDEs), and common frameworks or libraries is typically required. Strong problem-solving abilities, teamwork skills, and attention to detail help individuals excel in collaborative and fast-paced development environments. These skills and qualities are vital for producing high-quality code, supporting project goals, and contributing effectively to software development teams.

What is an assistant software developer?

An Assistant Software Developer is an entry-level professional who supports software development teams by assisting in coding, testing, debugging, and maintaining software applications. They typically work under the guidance of more experienced developers, helping to implement features, fix bugs, and learn best practices in software engineering. This role is ideal for recent graduates or those new to the field, providing valuable hands-on experience and an opportunity to build technical skills. Over time, Assistant Software Developers may advance to more senior roles as they gain experience and expertise.

What are some common challenges faced by assistant software developers when working on team projects?

Assistant Software Developers often encounter challenges such as understanding existing codebases, managing time effectively while balancing multiple tasks, and keeping up with rapidly changing project requirements. Collaboration is key, as you'll frequently work alongside senior developers, testers, and project managers, which requires clear communication and openness to feedback. Embracing these challenges helps build problem-solving skills and sets the stage for future career growth within the development team.
What are the most commonly searched types of Software Developer jobs in Belleville, IL? The most popular types of Software Developer jobs in Belleville, IL are:
What are popular job titles related to Assistant Software Developer jobs in Belleville, IL? For Assistant Software Developer jobs in Belleville, IL, the most frequently searched job titles are:
What job categories do people searching Assistant Software Developer jobs in Belleville, IL look for? The top searched job categories for Assistant Software Developer jobs in Belleville, IL are:
What cities near Belleville, IL are hiring for Assistant Software Developer jobs? Cities near Belleville, IL with the most Assistant Software Developer job openings:
Assistant Software Developer jobs near you
Infographic showing various Assistant Software Developer job openings in Belleville, IL as of August 2026, with employment types broken down into 87% Full Time, 8% Part Time, 3% Contract, and 2% Nights. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution, with an average salary of $97,388 per year, or $46.8 per hour.

Senior Software Engineer - Real Time Product Engineering

London Stock Exchange Group

Saint Louis, MO • On-site

$114K - $151K/yr

Full-time

Medical, Retirement, PTO

Re-posted 16 days ago

Job description

Senior Software Engineer - St. Louis
Companies across the world face fast-changing risks. Understanding and responding to those risks is essential to long-term success. As part of our St. Louis engineering team, you will help deliver solutions that empower customers to protect their brand, make confident decisions, and move quickly in a complex environment.
We're seeking a collaborative, motivated Senior Software Engineer who enjoys solving substantial problems, supporting other teams, and contributing to a culture of excellence. If you thrive in an empowered environment and want to make an impact on financial systems used across the organization, you'll be an excellent fit.
What You'll Do
As part of the Tools Team, you'll work closely with internal development groups, business analysts, and quality engineers. Your work will directly support the tools and utilities that enable teams to deliver high-quality software.
In this role, you will:
  • Build, maintain, and improve tools that help internal teams work more effectively.
  • Collaborate with multiple collaborators, each with their own priorities, in a dynamic environment.
  • Participate in and lead code reviews to support consistent engineering standards.
  • Help ushers LSEG's progress toward full DevOps adoption.
  • Develop scalable, future-focused solutions in partnership with the architecture team.
  • Work across multiple computer stacks and technology.
  • Develop a strong understanding of the financial domain to support partner teams.

This position is ideal for someone who enjoys learning, adapting, and helping others succeed.
Required Experience
  • Bachelor's degree in Computer Science, Software Engineering, or a related field
  • 5+ years of software development experience
  • Experience with multiple programming languages (e.g., C#, C++)
  • Strong understanding of Agile, Scrum, and DevOps practices
  • Validated knowledge of data structures, algorithms, and design patterns
  • Experience with version control systems (e.g., Git, DX1)
  • Proficiency with databases and SQL
  • Strong analytical and problem-solving skills
  • Excellent communication and collaboration skills
Preferred Skills
  • Experience with scripting languages (e.g., Python, Perl)
  • Familiarity with cloud platforms (AWS, Azure, or Google Cloud)
  • Knowledge of containerization and orchestration (Docker, Kubernetes)
  • Experience with automated testing frameworks
  • Experience using AI tools to accelerate development
    • We encourage the use of AI, including tools like Copilot, to improve efficiency and code quality.
    • Ability to evaluate new AI tools and make suggestions on how they can enhance team efficiency
    • Experience integrating AI-powered automation into development workflows
    • Familiarity with prompt-engineering techniques to get the most from AI coding assistants
What We Offer
  • Comprehensive health and wellness benefits
  • Flexible working hours and remote-work options
  • Paid time off for vacation, holidays, and sick leave
  • A supportive, creative, and growth-focused work environment with opportunities for career advancement

Join us as we reshape the future of financial markets-and build tools that make a real impact.
Career Stage:
Senior Associate
London Stock Exchange Group (LSEG) Information:
Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.
LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.
Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.
Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.
We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone's race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.
You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.
LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.
Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it's used for, and how it's obtained, your rights and how to contact us as a data subject.
If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.

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