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Sr Python Developer Jobs in Washington, DC (NOW HIRING)

ARSIEM

318 - Senior Python Developer

Fort George G Meade, MD · On-site

$134.70K - $181.30K/yr

ARSIEM is looking for a motivated Senior Python Developer with the right knowledge, skills, and abilities to support a new cybersecurity initiative. You will work closely with a small team and ...

WorkNova LLC

Python Developer

Reston, VA · On-site

$52.25 - $72/hr

Position Summary The Senior Python Developer will design, develop, test, and implement cloud native applications, data pipelines, and backend services within AWS. The role requires strong Python ...

Unisys

Python Developer

Reston, VA

$52.25 - $72/hr

We are seeking a Senior Python Developer to support the design, development, and scaling of cloud-native applications. The ideal candidate should have experience in end-to-end development, delivering ...

Ekcel Technologies Inc

Sr AWS Python Developer

Reston, VA · On-site

$126.40K - $170.10K/yr

Sr AWS Python Developer (2 positions) Location- Reston, VA (In person Client interview) day one onsite Experience : 8 to 18 years FTE or C2C We are looking for Visa independent candidates only for ...

Mavens Guild

Senior Spark & Python Developer

Mclean, VA · On-site

$122.80K - $165.30K/yr

In a senior developer role, you will design and build data flow and data integration processes to ... Drawing from your vast hands-on experience in Python (PySpark), Spark, REST, Java, and Scala, you ...

Mavens Guild

Senior Spark & Python Developer

Mclean, VA · On-site

$122.80K - $165.30K/yr

In a senior developer role, you will design and build data flow and data integration processes to ... Drawing from your vast hands-on experience in Python (PySpark), Spark, REST, Java, and Scala, you ...

Mavens Guild

Senior Spark & Python Developer

Mclean, VA · On-site

$122.80K - $165.30K/yr

In a senior developer role, you will design and build data flow and data integration processes to ... Drawing from your vast hands-on experience in Python (PySpark), Spark, REST, Java, and Scala, you ...

CyberMaxx

Senior Software Engineer, Python

Linthicum, MD · On-site

$120K - $140K/yr

We seek to hire a Senior Python Developer who will be responsible for designing and building novel tools in the cybersecurity SOAR and SIEM space, utilized by our clients and security analysts to ...

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How much do sr python developer jobs pay per year?

As of May 29, 2026, the average yearly pay for sr python developer in Washington, DC is $160,814.00, according to ZipRecruiter salary data. Most workers in this role earn between $137,600.00 and $185,200.00 per year, depending on experience, location, and employer.

What is a Sr Python Developer job?

A Sr Python Developer is an experienced software engineer who specializes in designing, developing, and maintaining applications using Python. They are responsible for writing clean, efficient, and scalable code while also mentoring junior developers and collaborating with cross-functional teams. Their role often includes optimizing application performance, integrating third-party services, and ensuring best coding practices. Additionally, they may work with frameworks like Django or Flask and databases such as PostgreSQL or MongoDB to build robust backend systems.

What are the key skills and qualifications needed to thrive in the Sr Python Developer position, and why are they important?

To thrive as a Sr Python Developer, you need expert proficiency in Python programming, strong problem-solving skills, and a solid background in computer science or related fields, often demonstrated by several years of relevant experience. Familiarity with frameworks like Django or Flask, version control systems such as Git, and sometimes certifications such as PCEP or PCAP are typically valued. Strong communication, leadership, and the ability to mentor junior developers are standout soft skills for this position. These combined proficiencies ensure that Sr Python Developers can build robust solutions, contribute to architectural decisions, and drive team success in complex technical environments.

What are the typical daily responsibilities of a Sr Python Developer?

As a Sr Python Developer, your daily tasks often include designing and coding complex features, reviewing code from team members, and troubleshooting bugs or performance issues. You may also lead technical discussions, contribute to architectural decisions, and collaborate closely with product managers, QA engineers, and other developers. Mentoring junior team members and staying up to date with best practices or new technologies is also a regular part of the role. This combination of hands-on engineering and leadership responsibilities ensures both the quality of the codebase and the continual growth of the team.
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Sr Python Developer jobs near you
Senior Python Developer (SWE-3)

Senior Python Developer (SWE-3)

Leidos

Fort George G Meade, MD • On-site

$107.90K - $195.05K/yr

Full-time

Retirement, PTO

Posted 2 days ago

Leidos rating

8.4

Company rating: 8.4 out of 10

Based on 146 frontline employees who took The Breakroom Quiz

58th of 424 rated business services

Job description

Leidos has a new and exciting opportunity for a Senior Python Developer in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!

Job Summary:

Our LOE program provides our customer's Operations organization with the best possible solutions for their mission needs. We achieve this through rapid prototyping, new development, and advanced technology research. From leading-edge visualizations to analytic development, we're always pushing the boundaries to find new and better data sources and tradecraft to answer intelligence questions. With a focus on collaboration and a fast-paced environment, our prototype development program is the ideal place to grow your skills and make a real impact. Clickhereto learn more about how this program "Delivers Mission Success!"

Seeking a motivated Senior Python Developer with the right knowledge, skills, and abilities to support a new cybersecurity initiative. You will work closely with a small team and mission stakeholders to capture requirements, create parsers for network protocols, develop fingerprints and signatures to identify suspicious and anomalous network activity, and deploy solutions to customer supported tools to automate and enable data and metadata analysis.

Job Responsibilities/Qualifications:

  • Mission Focus: Collaborate closely with customers to overlay network datasets through an existing architecture with the ABYSS product. Integrate parsers and signatures into ABYSS and develop tradecraft for front end sensors.
  • Technical Proficiency: Develop parsing and processing of network protocols to populate customer data repositories. Prototype and develop analytic workflows to automate tasks such as profiling network traffic/activity and detecting/alerting based on network changes.
  • Qualifications: Bachelor's degree in computer science, plus 8-years of relevant experience or equivalent. Proficiency with Python, C++, and Spark. Experience with Jupyter Notebooks, JIRA, Confluence, and Git/Gitlab. Understanding of ASDF and TCLD. Knowledge of XKEYSCORE/ABYSS fingerprints.
  • Security Clearance: Active TS/SCI with Polygraph required to be considered for this role.
  • Desirable Skills: General understanding of SNORT signatures. Familiarity with SCADA/industrial systems and related protocols.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you - apply today!

Careers.leidos.com

conmd

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:February 11, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

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About Leidos

Sourced by ZipRecruiter

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. We empower our teams, contribute to our communities, and operate sustainable practices. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community.

Industry

It services

Company size

10,000+ Employees

Headquarters location

Reston, VA, US

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