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Software Development Engineer 3 Jobs in Washington

Software Engineer 3

Hanover, MD · On-site

$57.25 - $76.75/hr

Utilizes software development and software design methodologies appropriate to the development ... The Level 3 Software Engineer (SWE) shall possess the following capabilities: * Analyze user ...

Software Engineer 3

Laurel, MD · On-site

$57 - $76.50/hr

Software Engineer 3 "Your Main Objective: Work with data scientist team to capture Cyber knowledge ... Support a wide-range of cyber knowledge development priorities to include workflows, requirements ...

Software Engineer III

Annapolis, MD · On-site

$57 - $76.50/hr

Reflexive Concepts is seeking a skilled Software Engineer III to join our team! The DevOps Software ... Recent software development experience using Rust and Python * Experience using Splunk for data ...

We are a fast paced and diverse team of database specialists and software engineers responsible for ... We are looking for individuals who have strong experience in backend development specializing in ...

Software Engineer 3

Annapolis, MD · On-site

$57 - $76.50/hr

Software Engineer 3 Location: Annapolis Junction, MD Compensation Range: $230 -$250K *Clearance ... Utilizes software development and software design methodologies appropriate to the development ...

SDET 3

Rockville, MD · On-site

$51 - $65.75/hr

The main function of a Software Development Engineer in Test (SDET) is to develop and execute software test plans in order to identify software problems and their causes. Job Responsibilities:

Software Engineer III

Washington, DC · On-site

$65 - $87.50/hr

Software Engineer III - Position Description We anticipate future opportunities for a Software ... Experience with applying modern software development methodologies (e.g. agile, DEVOPS/DEVSECOPS ...

Showing results 41-60

Software Development Engineer 3 information

What is a Software Development Engineer 3?

A Software Development Engineer 3 (SDE 3) is a senior-level software engineer responsible for designing, developing, and maintaining complex software systems. They typically have several years of experience, demonstrate strong technical skills, and often lead projects or mentor junior engineers. Proficiency in programming languages, system architecture, and problem-solving is essential for this role.

How does a Software Development Engineer 3 typically collaborate with cross-functional teams during the software development lifecycle?

As a Software Development Engineer 3, you will often work closely with product managers, quality assurance engineers, UX designers, and other developers to ensure alignment on project goals and technical requirements. Collaboration usually involves participating in sprint planning, code reviews, and design discussions, as well as providing mentorship to junior engineers. This level of engagement fosters a deeper understanding of the product and helps deliver high-quality software solutions that meet user and business needs.

What skills and qualifications are needed to thrive as a Software Development Engineer 3?

To thrive as a Software Development Engineer 3, you need advanced proficiency in programming languages like Java, Python, or C++, strong problem-solving abilities, and a bachelor’s degree in computer science or related field. Experience with version control systems (e.g., Git), cloud platforms (e.g., AWS or Azure), and familiarity with CI/CD pipelines and relevant certifications are often required. Effective communication, leadership, and collaboration skills help in mentoring junior engineers and working within agile teams. These competencies enable you to deliver robust software solutions, drive technical excellence, and contribute to both team and organizational success.

What are the roles and responsibilities of a Software Development Engineer 3?

A Software Development Engineer 3 (SDE3) is a senior-level software engineer responsible for designing, developing, and maintaining complex software systems. They often lead technical initiatives, mentor junior engineers, and contribute to architectural decisions. SDE3s are expected to have deep expertise in their technology stack, strong problem-solving skills, and the ability to drive projects from conception to deployment. They collaborate with cross-functional teams to deliver high-quality software solutions and may also participate in code reviews and technical interviews.
What job categories do people searching Software Development Engineer 3 jobs in Washington look for? The top searched job categories for Software Development Engineer 3 jobs in Washington are:
What cities in Washington are hiring for Software Development Engineer 3 jobs? Cities in Washington with the most Software Development Engineer 3 job openings:
Infographic showing various Software Development Engineer 3 job openings in Washington as of August 2026, with employment types broken down into 79% Full Time, and 21% Contract. Highlights an 90% In-person, and 10% Remote job distribution.

Software Engineer 3

T-Rex Solutions

Hanover, MD • On-site

$57.25 - $76.75/hr

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 26 days ago


Job description

T-Rex is looking for a talented Software Engineer 3 to work on a program in the Hanover, Maryland area in support of the Intelligence Community.

Responsibilities:

This Position Is An Onsite Role

The Software Engineer develops, maintains, and enhances complex and diverse software systems (e.g., processing-intensive analytics, novel algorithm development, manipulation of extremely large data sets, real-time systems, and business management information systems) based upon documented requirements. Works individually or as part of a team. Reviews and tests software components for adherence to the design requirements and documents test results. Resolves software problem reports. Utilizes software development and software design methodologies appropriate to the development environment. Provides specific input to the software components of system design to include hardware/software tradeoffs, software reuse, use of Commercial Off-the-shelf (COTS)/Government Off the-shelf (GOTS) in place of new development, and requirements analysis and synthesis from system level to individual software components.   

The Level 3 Software Engineer (SWE) shall possess the following capabilities:   

  • 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.
  • Additional contract or position specific required experience for this level (skills, technologies, expertise):   
  • Build applications using specified programming language per the development requirements.   
  • Development for Windows or UNIX applications using scripting languages (e.g., C, C++, C#, Java, and Python).   
  • Dev Ops- Build and deploy technologies (e.g., Artifactory, Docker, Terraform, Ansible, Packer)   (U) Cl/CD- Experience with Cl/CD tools (e.g., Jenkins and Bamboo), and building automated Cl/CD pipelines.  


Typically requires a Bachelor's degree and at least 20 years of related experience.
Active and transferable U.S. government issued TS/SCI with polygraph security clearance is required prior to start date.
U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.


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 $180,000 - $210,000. 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.