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Sr Software Engineer Iii Jobs (NOW HIRING)

Agentic Software Engineer III

Arlington, VA · On-site

$66.25 - $88.75/hr

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Software Engineer III

Reston, VA · On-site +1

$59.75 - $80.25/hr

We are looking for a Senior Python Engineer with a "hacker" mindset to join our team as a Software Engineer III. This role is dedicated to large-scale web scraping and data harvesting. If you have ...

Software Engineer III

Bentonville, AR · On-site

$49 - $65.75/hr

The Software Engineer-III designs, develops, troubleshoots, and debugs software programs for software enhancements and new products. Develops software tools including operating systems, compilers ...

Software Engineer III

San Diego, CA · On-site +1

$125K - $175K/yr

Software Engineer III ID: 1158 Location: San Diego, CA Description Gnostech, LLCis seeking a skilled Software Engineer III to support the Navy and Marine Corps (NAVWAR/NIWC Pacific) Meteorology and ...

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Sr Software Engineer Iii information

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$75.5K

$143.3K

$192K

How much do sr software engineer iii jobs pay per year?

As of Jul 16, 2026, the average yearly pay for sr software engineer iii in the United States is $143,292.00, according to ZipRecruiter salary data. Most workers in this role earn between $122,500.00 and $161,500.00 per year, depending on experience, location, and employer.

What are Sr Software Engineer III roles and responsibilities?

A Sr Software Engineer III is a senior technical professional responsible for designing, developing, testing, and maintaining complex software systems. They often lead project teams, mentor junior engineers, and collaborate with cross-functional departments to deliver high-quality software products. In addition, they contribute to architectural decisions, code reviews, and process improvements to ensure best practices are followed. Their role typically requires extensive technical expertise, leadership skills, and the ability to solve challenging problems.

How does a Sr Software Engineer III typically collaborate with cross-functional teams on large-scale projects?

As a Sr Software Engineer III, you will frequently work alongside product managers, designers, QA engineers, and other stakeholders to deliver complex projects. Collaboration often involves participating in architectural discussions, code reviews, and sprint planning sessions to ensure alignment across teams. You may also mentor junior engineers and help break down large tasks into manageable components, ensuring smooth coordination and timely delivery. Effective communication and the ability to balance technical and business requirements are key to success in this role.

What are the key skills and qualifications needed to thrive as a Sr Software Engineer III, and why are they important?

To thrive as a Sr Software Engineer III, you need advanced proficiency in software development, problem-solving, and system architecture, typically backed by a relevant degree and several years of experience. Mastery of programming languages (such as Java, Python, or C++), familiarity with cloud platforms, and knowledge of development tools like Git and CI/CD pipelines are crucial. Leadership, effective communication, and the ability to mentor junior engineers are standout soft skills in this role. These competencies ensure the delivery of robust, scalable solutions and foster team growth in complex technical environments.

What is the difference between Sr Software Engineer Iii vs Software Engineer Iii?

AspectSr Software Engineer IiiSoftware Engineer Iii
Required CredentialsBachelor's degree in CS or related field; 5+ years experience; proficiency in multiple programming languagesBachelor's degree in CS or related field; 3-5 years experience; strong coding skills
Work EnvironmentLeads projects, mentors junior staff, collaborates with cross-functional teamsDevelops features, writes code, participates in team meetings
Employer & Industry UsageUsed in tech companies, software firms, and enterprise environmentsCommon in tech startups, mid-sized companies, and large corporations

The main difference between a Sr Software Engineer Iii and a Software Engineer Iii lies in experience and responsibilities. The senior role typically involves leadership, mentorship, and project oversight, while the standard engineer focuses on coding and feature development. Both roles require strong technical skills, but the senior position demands more experience and strategic input.

More about Sr Software Engineer Iii jobs
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What job categories do people searching Sr Software Engineer Iii jobs look for? The top searched job categories for Sr Software Engineer Iii jobs are:
Senior Software Engineer 3

Senior Software Engineer 3

T-Rex Solutions

Annapolis Junction, MD

$134K - $177K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted 4 days ago


Job description

Are you ready to make a significant impact by supporting critical national security infrastructure? T-Rex Solutions is looking for a fully cleared Senior Software Engineer 3 to join our dynamic team at Ft. Meade, MD in support of the Intelligence Community.

We are seeking developers for a high priority and highly visible malware analysis modernization program. The individual will work with a team of dynamic and innovative engineers to develop new capabilities supporting the virtual malware containment enclave . The individual will also support the modernization of malware enrichment services.

Required Skills:

  • Analyze user requirements to derive software design and performance requirements
  • Debug existing software and correct defects
  • Provide recommendations for improving documentation and software development process standards
  • Design and code new software or modify existing software to add new features
  • Integrate existing software into new or modified systems or operating environments
  • Develop simple data queries for existing or proposed databases or data repositories
  • Write or review software and system documentation
  • Serve as team lead at the level appropriate to the software development process being used on any particular project
  • Design or implement complex database or data repository interfaces/queries
  • Develop or implement algorithms to meet or exceed system performance and functional standards
  • Assist with developing and executing test procedures for software components
  • Develop software solutions by analyzing system performance standards, confer with users or system engineers; analyze systems flow, data usage and work processes; and investigate problem areas
  • Modify existing software to correct errors, to adapt to new hardware, or to improve its performance
  • Design, develop and modify software systems, using scientific analysis and mathematical models to predict and measure outcome and consequences of design
  • Design or implement complex algorithms requiring adherence to strict timing, system resource, or interface constraints; Perform quality control on team products
  • Implement recommendations for improving documentation and software development process standards
  • Oversee one or more software development teams and ensure the work is completed in accordance with the constraints of the software development process being used on any particular project
  • Confer with system engineers and hardware engineers to derive software requirements and to obtain information on project limitations and capabilities, performance requirements and interfaces
  • Coordinate software system installation and monitor equipment functioning to ensure operational specifications are met
  • Recommend new technologies and processes for complex software projects
  • Serve as the technical lead of multiple software development teams
  • Select the software development process in coordination with the customer and system engineering
  • Ensure quality control of all developed and modified software
  • Delegate programming and testing responsibilities to one or more teams and monitor their performance

Desired Skills:

  • Kotlin
  • Spring or Spring Boot
  • Python
  • Java Application (no front end necessary), REST
  • Mongo

Requirements:

  • Bachelor's and 12 years of related experience or 25 years of related experience without a degree.
  • Active TS/SCI w/ FSP required within 7 years.

T-Rex Overview

Established in 1999, T-Rex Solutions, LLC is a proven mid-tier business providing data-centric mission services to the Federal government as it increasingly tries to secure and leverage the power of data. We design, integrate, secure, and deploy advanced technical solutions for our customers so they can efficiently fulfill their critical objectives. T-Rex offers both IT and professional services to numerous Federal agencies and is a leader in providing high quality and innovative solutions in the areas of Cloud and Infrastructure Services, Cyber Security, and Big Data Engineering.

T-Rex is constantly seeking qualified people to join our growing team. We have built a broad client base through our devotion to delivering quality products and customer service, and to do that we need quality individuals. But more than that, we at T-Rex are committed to creating a culture that supports the development of every employee's personal and professional lives. T-Rex has made a commitment to maintain the status of an industry leader in compensation packages and benefits which includes competitive salaries, performance bonuses, training and educational reimbursement, Transamerica 401(k) and Cigna healthcare benefits.

T-Rex is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, religion, color, sex (including pregnancy and sexual orientation), parental status, national origin, age, disability, family medical history or genetic information, political affiliation, military service, or other non-merit based factors.

In compliance with pay transparency guidelines, the annual base salary range for this position is $200,000 - $250,000. Please note that the salary information is a general guideline only. T-Rex considers factors such as (but not limited to) scope and responsibilities of the position, candidate's work experience, education/training, key skills, internal peer equity, as well as market and business considerations when extending an offer.

T-Rex offers a diverse and collaborative work environment, exciting opportunities for professional growth, and generous benefits, including: PTO available to use immediately upon joining (prorated based on start date), paid parental leave, individual and family health, vision, and dental benefits, annual budget for training, professional development and tuition reimbursement, and a 401(k) plan with company match fully vested after 60 days of employment among other benefits.