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Senior Unix Engineer Jobs in Missouri (NOW HIRING)

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

Title and Summary Senior Software Engineer All About Us MasterCard is a technology company in the ... Web Services - SOAP/ RESTFul, Servers - WebSphere/JBOSS/Tomcat, HTML/ javascript/ JQuery, UNIX ...

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology ... Solaris/UNIX or Red Hat Linux • Experience integrating vendor and open-source solutions into ...

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology ... Solaris/UNIX or Red Hat Linux Experience integrating vendor and open-source solutions into ...

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology ... Solaris/UNIX or Red Hat Linux • Experience integrating vendor and open-source solutions into ...

Job Title: Sr AWS Developer Location: St Louis, MO - Remote Start Duration: 6+ Months Contract then ... Good background in Linux/Unix administration and Ability to spin off new instances. * VPC ...

Express Scripts POSITION SUMMARY : B2B/EDI engineer responsible for detail design, development ... QUALIFICATIONS • Advanced WTX/Mercator programming skills. • Advanced UNIX/Linux skills. • ...

Express Scripts POSITION SUMMARY : B2B/EDI engineer responsible for detail design, development ... Advanced UNIX/Linux skills. Advanced knowledge of client integration (B2B) concepts and Electronic ...

Senior Site Reliability Engineer

O Fallon, MO · On-site

$53.25 - $70.75/hr

Title and Summary Senior Site Reliability Engineer Overview The BizOps team is looking for a Senior ... Unix, Shell Scripting, SQL, Python, Apache Nifi, Splunk, Dynatrace, Jenkins, GIT, XLR etc. We ...

Sr. ETL Developer

Kansas City, MO · On-site

$49.75 - $65.25/hr

Sr. ETL Developer Kansas City MO 1 Year Plus contract MUST HAVES Datastage, SSIS, Hadoop. Job ... Unix. 3-5 years of Experience in SQL Server, SSIS, SSRS and SSAS 1-2 years of Informatica ...

Sr. ETL Developer

Independence, MO · On-site

$46.50 - $60.75/hr

Sr. ETL Developer Kansas City MO 1 Year Plus contract MUST HAVES Datastage, SSIS, Hadoop. Job ... Unix. 3-5 years of Experience in SQL Server, SSIS, SSRS and SSAS 1-2 years of Informatica ...

ENGR SR SOFTWARE DEVT

Kansas City, MO · Remote

$119K - $157K/yr

Senior Software Engineer 3M Health Care is now Solventum At Solventum, we enable better, smarter ... Experience developing code for a Linux/Unix based operating system. * Experience developing and ...

Showing results 21-40

Senior Unix Engineer information

See Missouri salary details

$55.8K

$118.7K

$172.1K

How much do senior unix engineer jobs pay per year?

As of Aug 10, 2026, the average yearly pay for senior unix engineer in Missouri is $118,711.00, according to ZipRecruiter salary data. Most workers in this role earn between $98,000.00 and $134,600.00 per year, depending on experience, location, and employer.

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

To thrive as a Senior Unix Engineer, you need deep expertise in Unix/Linux system administration, scripting, troubleshooting, and a relevant degree or equivalent experience. Familiarity with automation tools (such as Ansible or Puppet), shell scripting languages (like Bash or Perl), and certifications like RHCE or CompTIA Linux+ is highly valued. Strong problem-solving skills, effective communication, and the ability to mentor junior staff help set top performers apart in this role. These skills ensure reliable systems, smooth operations, and robust support for complex enterprise environments.

What does a senior Unix engineer do?

A Senior Unix Engineer is responsible for designing, implementing, and maintaining Unix-based systems within an organization. They handle advanced troubleshooting, system performance tuning, security configurations, and ensure the reliability and scalability of Unix infrastructure. In addition, they often mentor junior engineers, develop automation scripts, and collaborate with other IT teams to support business operations. Their expertise is crucial for managing large-scale, mission-critical environments.

What is the difference between Senior Unix Engineer vs System Administrator?

AspectSenior Unix EngineerSystem Administrator
CredentialsBachelor's in Computer Science, Unix/Linux certifications (e.g., RHCE, LPIC)Bachelor's in IT or related field, Linux/Unix certifications often preferred
Work EnvironmentDesigning, implementing, and maintaining Unix systems, often in enterprise environmentsManaging daily system operations, troubleshooting, and user support
Industry UsageTech, finance, healthcare, and large enterprisesVaries across industries, including small to large organizations
Search & Comparison IntentFocus on advanced Unix skills and system designFocus on operational support and system maintenance

The main difference is that Senior Unix Engineers focus on designing and optimizing Unix systems, while System Administrators handle daily operations and support. Both roles require similar certifications and work in related environments, but their responsibilities differ in scope and complexity.

What are some of the most common challenges faced by senior Unix engineers in a large enterprise environment?

Senior Unix Engineers in large enterprises often face challenges related to managing complex, heterogeneous server environments and ensuring high availability. Balancing routine maintenance, security patching, and system upgrades with the need to minimize downtime can be demanding. Additionally, staying up to date with evolving technologies and scripting languages, while coordinating with cross-functional teams like network, storage, and application groups, requires strong communication and problem-solving skills.
What are popular job titles related to Senior Unix Engineer jobs in Missouri? For Senior Unix Engineer jobs in Missouri, the most frequently searched job titles are:
What job categories do people searching Senior Unix Engineer jobs in Missouri look for? The top searched job categories for Senior Unix Engineer jobs in Missouri are:
What cities in Missouri are hiring for Senior Unix Engineer jobs? Cities in Missouri with the most Senior Unix Engineer job openings:
Infographic showing various Senior Unix Engineer job openings in Missouri as of August 2026, with employment types broken down into 93% Full Time, 2% Part Time, and 5% Contract. Highlights an 86% Physical, 5% Hybrid, and 9% Remote job distribution, with an average salary of $118,711 per year, or $57.1 per hour.

Senior Software Engineer

MasterCard

O Fallon, MO • On-site

$114K - $151K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 3 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 EngineerAll About Us
MasterCard is a technology company in the global payments business. We connect consumers, financial institutions, merchants, governments, and businesses worldwide and enable them to use secure and convenient electronic forms of payment.
Join the industry's most passionate, motivated & engaged global team - Our employees are encouraged to drive innovation every day in support of a more connected world - A World Beyond Cash.
Overview:
The MasterCard B&MI Technology development team is engaged in working with new and innovative technologies to build business solutions that keep MasterCard positioned as a leader in delivering value added business analytic and reporting solutions to our diverse customer base. We work collaboratively with our product partners and other technical teams to continuously improve and enhance our existing products and drive new products to the global marketplace. We are currently seeking candidates that will be responsible to support the technical lead in overall architecture, design and produce a high-quality code using different languages.
Role:
This position is a member of the MasterCard B&MI Technology focusing on development of Enterprise Application Development using Java tech stack and Angular/React as the Front-end technologies.
Participate in the gathering of business requirements.
Ensure software designs align with MasterCard's Enterprise Architecture and leverage our enterprise services.
Ensure product development meets MasterCard's business needs.
Ensure development teams use the appropriate MasterCard standard development methodologies and follow our technology standards, and that all projects and development are appropriately documented.
Ensure that software and system design and delivery support the goal of zero down time in production.
Work closely with business partners on product definition, product roadmaps, business case development, and overall direction for the team.
Respond to operational and business concerns or issues relative to future business programs, projects, or enhancements to ensure consistent delivery of quality services.
Ensure development supports all appropriate certifications and compliance requirements, including those for PCI, GLBA, Safe Harbor, and others.
Responsible for performance engineering of the enterprise software architecture, and providing functional guidance, advice, and/or training to other application developers.
Responsible for designing, developing, testing, delivering, and monitoring scalable and secure cloud architectures, using various AWS cloud and cloud native platforms, such as EC2, ECS, S3.
Need to improve and expand the existing platform by ensuring that it is resilient, secure, and scalable.
All About You:
Bachelor's degree in Information Systems, Information Technology, Computer Science or Engineering or equivalent work experience
Excellent Communication skills required to interact across multiple organizational levels of internal and external customer groups.
Strong analytical and problem-solving abilities, with quick adaptation to new technologies, methodologies, and systems
High-energy, detailed-oriented, proactive, and able to function under pressure in an independent environment along with a high degree of initiative and self-motivation to drive results.
Strong interpersonal, relationship-building with a solid track record for developing internal and external.
Proficient working with J2EE, Java 8 or higher, JSP, Servlets, Spring 5, Hibernate, and Database (Oracle, SQL Server)
Experience with SQL and NO SQL databases like MySQL, Postgres, MongoDb etc.
Experience in the following a plus: Web Services - SOAP/ RESTFul, Servers - WebSphere/JBOSS/Tomcat, HTML/ javascript/ JQuery, UNIX ( Shell, awk scripting), XML/ XSLT, CSS, C Sharp, React / Angular , IDE (Microsoft Visual Studio, RAD/ Eclipse)
Experience with various tools(Maven, Gradle, Jenkins, Chef, Sonar) and methodologies ( Waterfall, Agile)
Prior experience in Cloud Native Application DevelopmentMastercard 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