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Software Engineer Contract Jobs in Missouri (NOW HIRING)

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

Proficient in authoring test code with lots of smaller tests followed by few contract tests at ... degree in software engineering, computer science, information technology or related discipline ...

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

... contract tests at service level and fewer journey tests at the integration level (Test Pyramid ... degree in software engineering, computer science, information technology or related discipline ...

Work with software lead to understand requirements and translate into technical specification for ... Contract-to-Hire 3-6 months * Must be US-Citizen or Green-Card only * Will be required to travel ...

Mid-Level Software Engineer

Saint Louis, MO · On-site

$87K - $157K/yr

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

Mid-Level Software Engineer

Earth City, MO · On-site

$87K - $157K/yr

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

Mid-Level Software Engineer

Fenton, MO · On-site

$87K - $157K/yr

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

... boundaries, contracts, ownership, and long-term platform direction * Remain hands-on in the ... software engineering experience, including significant technical leadership across complex ...

Mid-Level Software Engineer

Bridgeton, MO · On-site

$87K - $157K/yr

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

Mid-Level Software Engineer

Saint Louis, MO · On-site

$87K - $157K/yr

US citizenship is required per contract. * Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with 2-6 years of prior ...

SR. SOFTWARE ENGINEER

Saint Louis, MO · On-site +1

$119K - $157K/yr

Leadership * Coach less senior Software Engineers in processes, techniques and problem solving ... Contract-to-Hire 3-6 months * Must be US-Citizen or Green-Card only * Will be required to travel ...

Showing results 21-40

Software Engineer Contract information

See Missouri salary details

$59.6K

$138.4K

$192.8K

How much do software engineer contract jobs pay per year?

As of Aug 11, 2026, the average yearly pay for software engineer contract in Missouri is $138,378.00, according to ZipRecruiter salary data. Most workers in this role earn between $112,600.00 and $162,300.00 per year, depending on experience, location, and employer.

What is a software engineer contract?

Software engineer contracts are agreements where software engineers are hired on a temporary basis to work on specific projects or for a set period of time, rather than as permanent employees. Contractors often work for multiple clients, are paid hourly or per project, and may have more flexible schedules. These contracts outline the scope of work, compensation, deadlines, and other terms. Contract software engineers are responsible for delivering quality code and meeting the requirements set by the client or organization. This working arrangement can offer more autonomy, but also less job security and benefits compared to full-time employment.

What are the key skills and qualifications needed to thrive as a software engineer contract?

To thrive as a Software Engineer Contract, you need strong programming skills, a solid understanding of software development methodologies, and a relevant degree or proven experience in computer science or related fields. Familiarity with source control systems (e.g., Git), cloud platforms, and proficiency in languages or frameworks required by the contract are crucial, as are any certifications in areas like AWS or Agile methodologies. Excellent problem-solving, adaptability, and communication skills help you quickly integrate with new teams and deliver results in diverse environments. These skills ensure you can efficiently contribute to projects, meet client expectations, and maintain professional flexibility across various assignments.

What is the difference between Software Engineer Contract vs Software Engineer Full-Time?

AspectSoftware Engineer ContractSoftware Engineer Full-Time
Employment TypeTemporary, project-basedPermanent, ongoing
Work EnvironmentTypically freelance or agency-basedCompany offices or remote
CredentialsUsually similar certifications and skillsSame as contract roles
BenefitsLimited or no benefitsHealth, retirement, paid leave

In summary, Software Engineer Contract roles are temporary positions focused on specific projects, often with fewer benefits, while Software Engineer Full-Time roles offer permanent employment with comprehensive benefits. Both roles require similar skills and credentials but differ mainly in employment stability and perks.

What are some common challenges faced by software engineers working on contract positions, and how can they be managed?

Software engineers on contract often face challenges such as quickly adapting to new codebases, understanding diverse team workflows, and managing changing project scopes. It's important to proactively communicate with team members, clarify project requirements early on, and stay organized to meet tight deadlines. Additionally, maintaining a strong personal workflow and being open to feedback can help contract engineers integrate more smoothly and deliver high-quality results within limited timeframes.
What are the most commonly searched types of Software Engineer jobs in Missouri? The most popular types of Software Engineer jobs in Missouri are:
What are popular job titles related to Software Engineer Contract jobs in Missouri? For Software Engineer Contract jobs in Missouri, the most frequently searched job titles are:
What cities in Missouri are hiring for Software Engineer Contract jobs? Cities in Missouri with the most Software Engineer Contract job openings:
Infographic showing various Software Engineer Contract job openings in Missouri as of August 2026, with employment types broken down into 1% Internship, 90% Full Time, 6% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $138,378 per year, or $66.5 per hour.

Senior Software Engineer

MasterCard

O Fallon, MO

$114K - $151K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 4 days ago


Job description

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build asustainableeconomy where everyone can prosper. We support a wide range of digital payments choices, making transactionssecure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Senior Software EngineerWho is Mastercard?
We work to connect and power an inclusive, digital economy that benefits everyone, everywhere, by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team - one that makes better decisions, drives innovation, and delivers better business results.
Technology at Mastercard
What we create today will define tomorrow. Revolutionary technologies that reshape the digital economy to be more connected and inclusive than ever before. Safer, faster, more sustainable.
And we need the best people to do it. Technologists who are energized by the challenges of a truly global network. With the talent and vision to create the critical systems and products that power global commerce and connect people everywhere to the vital goods and services they need every day.
Working at Mastercard means being part of a unique culture. Inclusive and diverse, a rich collaboration of ideas and perspectives. A place that celebrates your strengths, values your experiences, and offers you the flexibility to shape a career across disciplines and continents. And the opportunity to work alongside experts and leaders at every level of the business, improving what exists, and inventing what's next.
Payment Enablement Program
The Payment Enablement program provides a suite of value-added switching services to each qualified transaction processed by Mastercard, increasing the security, accessibility, and simplicity of data for participating customers.
About the Role
Software Engineers at Mastercard design and code artificial intelligence, cloud, and machine learning platforms that provide mission-critical insights to many of the world's leading organizations and governments. As a Software Engineer, you will deliver these products and solutions with speed and agility as part of a small team. This will involve developing high-performing, highly scalable software solutions and products for some of the world's top brands. Specific tasks vary depending on the project and the business unit that you join in.
All staff at Mastercard are expected to demonstrate 'Mastercard Way' cultural values every day - own it, simplify it, sense of urgency, thoughtful risk-taking, unlock potential, and be inclusive - with a relentless focus on our customers.
As a Senior Software Engineer at Mastercard, you are expected to perform the following general responsibilities:
Actively participate in team prioritization discussions with Product/Business stakeholders
Estimate and own delivery tasks (design, dev, test, deployment, configuration, documentation) to meet the business requirements
Drive code/design/process trade-off discussions within their team when required
Perform demos/acceptance discussions in interacting with Product owners
Develop complete understanding of end-to-end technical architecture and dependency systems
Drive adoption of technology standards and opinionated frameworks, and review coding, test, and automation work of team members
Mentor and guide new and less-experienced team members
Identify opportunities to improve an overall process and trim waste; Share and seek knowledge within Guild/Program to drive reuse of patterns/libraries/practices and enhance productivity
All About You
Skillful at writing secure code in multiple languages; Familiar with secure coding standards (e.g., OWASP, CWE, SEI CERT) and vulnerability management
Understands the basic engineering principles used in building and running mission critical software capabilities (security, scalability, resiliency, performance, operability, customer experience, testing, and simplification)
Strong understanding of software design, software architecture, data structures, and algorithms, with the ability to develop scalable and maintainable solutions.
Proficient in authoring test code with lots of smaller tests followed by few contract tests at service level and fewer journey tests at the integration level (Test Pyramid concept)
Apply tools (e.g., Sonar, Zally, Checkmarx) and techniques to scan and measure code quality and anti-patterns as part of development activity
Experience conducting code reviews and troubleshooting complex application and production issues in distributed systems.
Proficient in collaborating with team and business stakeholders to estimate requirements (e.g., story pointing) and prioritize based on business value
Able to perform domain-driven design to architect and map software solutions to business contexts
Proficient in orchestrating release workflows and pipelines, and apply standardized pipelines via APIs to achieve CI and CD using industry standard tools (e.g., Jenkins, AWS/Azure pipelines, XL Release, others); Able to configure rules and build automation for code with vulnerability scanning and software composition analysis using standard tools (e.g., Sonar, Checkmarx, JFrog XRay, Veracode, others)
Manage builds and artifacts leveraging standard tools (e.g., Artifactory) to ensure error-free deployment of production code using canary and or blue-green techniques
Experience with performance tuning, monitoring, observability, and maintaining highly available production systems.
Proficient in authoring test cases leveraging behavior-driven development and customer journey concepts
Experience developing applications which use cryptography preferred
Bachelor's degree in software engineering, computer science, information technology or related discipline preferred, or equivalent work experience; Payment industry knowledge preferred but not requiredMastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact reasonable_accommodation@mastercard.com and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

Corporate Security Responsibility


All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

  • Abide by Mastercard's security policies and practices;

  • Ensure the confidentiality and integrity of the information being accessed;

  • Report any suspected information security violation or breach, and

  • Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.

In line with Mastercard's total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account; paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave); 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire; 10 annual paid U.S. observed holidays; 401k with a best-in-class company match; deferred compensation for eligible roles; fitness reimbursement or on-site fitness facilities; eligibility for tuition reimbursement; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.

Pay Ranges

O'Fallon, Missouri: $115,000 - $184,000 USD