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Senior Python Developer Jobs in Leesburg, VA, US
2,200+ senior python developer jobs from 510+ companies hiring in Leesburg, VA, US.
2mo
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Vulnerability Researcher (Android) / Software Engineer (VR), Senior-Level
Chantilly, Virginia, United States
OnsiteFull Time
8+ YOESenior-level vulnerability researcher with 8+ years in vulnerability research/reverse engineering; strong Android experience; proficient in C/C++, Python; reverse engineering tools (IDA Pro, Ghidra, Frida); active TS/SCI eligible security clearance.
Android, C/C++, Python, IDA Pro, Ghidra, Frida
2mo
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Staff Engineer
Chantilly or Washington
HybridFull Time
4+ YOE4+ years building web apps with Node.js/React/Next.js; Python; AI platforms; Zapier; secure coding; SQL/relational modeling.
Node.js, React, Next.js, Laravel, Python, Zapier, OpenAI API, Google Gemini API, Codex CLI, Claude Code, Gemini CLI, NotebookLM, OAuth, OIDC, Swagger, MySQL, PostgreSQL, Git, CI/CD, Docker, Vitest, Pytest
2mo
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Software Engineer, Backend - AI Practice Team
Houston or Knoxville or Washington
$90k-$150k/yr OnsiteFull Time
8+ YOE8+ years backend development; Go and Python; cloud deployment; Kafka; distributed systems patterns; performance optimization; Docker/Kubernetes; Databricks.
Go, Python, Kafka, Docker, Kubernetes, Databricks
6d
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Senior Data Analytics Engineer
Reston, Virginia, United States
OnsiteFull Time
5+ YOE5+ years in data and analytics engineering; strong SQL and dimensional modeling; Python, PySpark, SparkSQL; Microsoft Fabric experience; end-to-end data solutions; Git; ML/AI familiarity.
SQL, Python, PySpark, SparkSQL, Microsoft Fabric, Fabric Notebooks, Git
1mo
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Engineering Lead (Python & Django)
Arlington, Virginia, United States
HybridFull Time
7+ YOE1+ Mgmt7+ years of software engineering experience with strong expertise in Python and Django; proven leadership of projects or teams; experience building scalable web applications; ability to obtain government clearance.
Python, Django, REST APIs, PostgreSQL, MySQL
1w
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Red Team Senior Close Access Network Capability/Wi-Fi Developer
Fort Belvoir, Virginia, United States
OnsiteFull Time
5+ YOETop Secret/SCI clearance; 5+ years offensive cyber tool and wireless capability development; Python, C/C++, Go; Linux development; travel 15%; pass aptitude test.
Python, C / C++, Go, Linux
2mo
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Principal Engineer, Software (Reston, VA, US, 20191)
Reston, Virginia, United States
OnsiteFull Time
10+ YOEUS citizenship, ability to obtain/maintain security clearance, BS in CS or related field, 10+ years in applications development, strong communication, multi-architecture development, expert in JS (TypeScript/React/Angular) and Python, SDLC/Agile, SOLID, data eng, Docker/Kubernetes, cloud-native, secure DevOps.
JavaScript, TypeScript, React, Angular, Python, Docker, Kubernetes, SQL, ETL, Data warehousing, Data streaming
1w
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Senior Data Platform Engineer
Detroit or Miami or New York or San Francisco or Washington
$160k-$200k/yr HybridAll Commitments Available
6+ YOE6+ years of data infrastructure/engineering experience; 4+ years with modern data stacks; 2+ years building production data pipelines; strong SQL, Python; Terraform; cloud-based IaC; ownership mindset.
SQL, Python, Terraform, BigQuery, Snowflake, Redshift, dbt, Fivetran, Postgres, Pulumi, CloudFormation, Looker
3w
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Senior Software Development Engineer L4
Bowie or Bowie Government Office
$85k-$170k/yr OnsiteFull Time
5+ YOE5+ years software development; strong C# and MS SQL; testing/architecture experience; AWS interest; independent contributor; strong collaboration.
C#, MS SQL Server, Python, Lua, AWS
1mo
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Senior Test Engineer
Manassas, Virginia, United States
$85k-$95k/yr OnsiteFull Time
2+ YOEBachelor's or Technology degree in engineering or related field, 2+ years of experience or a Master's with 6 months experience; Secret clearance; U.S. citizenship.
DOORS, Selenium, JUnit, pytest, Python, Bash, PowerShell, JIRA, Bugzilla
1mo
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Software Developer 6
Springfield, Virginia, United States
OnsiteFull Time
12+ YOEActive Top Secret clearance with SCI eligibility; 12+ years of related experience or 9+ years with Master’s; DoD 8570 IAT Level II+ (e.g., CISSP, Security+); strong coding in C#, Java, Python; front-end HTML/CSS/JS, Angular/React; SQL/MongoDB; excellent communication and teamwork.
HTML, CSS, JavaScript, XML, jQuery, C#, Java, Python, Angular, React, Node.js, MySQL, MongoDB, Apache
1mo
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Windows CNO Developer
Arlington, Virginia, United States
$60k-$180k/yr OnsiteFull Time
7+ YOEActive TS/SCI clearance; 7–10+ years in low-level or systems programming on Windows; proficiency in C/C++, Python, and assembly; experience with reverse engineering tools; strong Windows internals knowledge.
IDA Pro, Ghidra, WinDbg, x64dbg, Visual Studio, Git, CMake, Python, C/C++, Assembly
1mo
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Software Engineer 3
Annapolis Junction, Maryland, United States
OnsiteFull Time
20+ YOEActive TS/SCI with Poly, US citizen, 20 years experience, BS in CS, strong Java and Python, ML/AI skills.
Java, Python, Machine Learning, Artificial Intelligence, Cloud Platforms, Containerization
2mo
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Senior Network Engineer (Active Secret Clearance Required)
Alexandria or Washington
OnsiteFull Time
5+ YOEBachelor's degree preferred; 5+ years network engineering/architecture; 3+ years Cisco SD-WAN; Active Secret Clearance; IAT II/III certs.
Cisco SD-WAN, Cisco 4331, Cisco C8300, UCS servers, Firepower Management Center, Python, Ansible, AWS, Azure
1w
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Senior Electrical Engineer - RF Systems - Lunar Permanence
Seattle or Reston
$157k-$220k/yr OnsiteFull Time
Blue Origin: Develops reusable rockets and systems for human spaceflight.
8+ YOEBachelor's in Electrical Engineering with 8+ years’ experience or Master’s with 6+ years; experience in high-speed mixed-signal circuits, PCB design/layout, and RF hardware; proficiency with Altium Designer or Cadence toolchains.
Altium Designer, Cadence OrCAD, Cadence Allegro, Python, MATLAB, Simulink, SPICE, SpaceWire, I2C, SPI, UART, DDS, JESD204B/C, FPGA, DDR
1mo
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Full Stack Developer - Tech Dev (TS/SCI Required)
Washington or Reston
$165k-$185k/yr OnsiteFull Time
7+ YOE7+ years software development; full stack; TS/SCI clearance; BS or AS with 10+ years exp; strong JS/TS, .NET/C#, Python; SQL/ORM; Git; Agile; able to work with government clients.
.NET, C#, Python, JavaScript, TypeScript, React
3w
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Gen AI Developer
Washington, District of Columbia, United States
$115k-$135k/yr HybridFull Time
6+ YOEDegree in CS/Data Science/AI; Python; AI frameworks (TensorFlow, PyTorch); NLP and generative AI; LangChain/LangGraph; Google Cloud/Azure; 6-8 years AI experience; cloud architecture and LLM integration.
Python, TensorFlow, PyTorch, LangChain, LangGraph, Google Cloud, Azure, Azure Databricks, Azure Data Factory, Azure Cosmos DB, Azure Cognitive Services, Azure Storage, Azure Service Bus, Azure Functions, Azure API Management, Databricks, Natural Language Processing, LLM, Vector databases
1mo
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Lead- Full Stack Engineer
McLean, Virginia, United States
HybridFull Time
10+ YOE10+ years in full stack development; hands-on Vue.js, Node.js, Python; GenAI/LLM integration; AWS cloud services (Lambda, S3, RDS, Fargate); REST/GraphQL APIs; Kafka; Docker; Kubernetes; RDBMS (Postgres/MySQL/Oracle)
Vue.js, Node.js, Python, GenAI/LLM, AWS (Lambda, S3, RDS, Fargate), REST APIs, GraphQL, Kafka, Docker, Kubernetes, PostgreSQL, MySQL, Oracle, CI/CD
1mo
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Software Engineer
Annapolis Junction, Maryland, United States
$200k-$225k/yr OnsiteFull Time
14+ YOEActive TS/SCI with Polygraph; 14+ years software engineering; Bachelor’s in CS/Engineering/Math/Physics; strong Java, Python, JavaScript (React); REST APIs; AWS; Docker/Kubernetes; IaC (Ansible or similar); Agile experience.
Java, Python, JavaScript, React, REST APIs, AWS, Docker, Kubernetes, Ansible, GitHub, GitLab, Jenkins
1mo
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Principal Security Software Engineer, Applied Computing (Starshield)
Washington, District of Columbia, United States
$221k-$300k/yr OnsiteFull Time
8+ YOE8+ years in security software development; BS in CS/STEM or equivalent; Python/C++/Golang; OS/distributed systems security; AI/LLM integration experience.
Python, C++, Golang
2mo
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Solutions Engineer
Washington, District of Columbia, United States
$185k-$220k/yr OnsiteFull Time
Strong engineering background; excellent communication; public sector experience; proficient in Python/JavaScript/Typescript/Bash; able to work fast-paced; active US government security clearance; DC-based or willing to relocate; AI/ML background preferred.
Python, JavaScript/TypeScript, Bash
3mo
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Senior AI/ML Engineer (Azure)
Bethesda, Maryland, United States
HybridFull Time
Senior AI-ML Engineer with deep Microsoft Azure experience, leading cross-functional teams, strong ML lifecycle and data engineering skills.
Python, PyTorch, TensorFlow, Scikit-learn, LangChain, Semantic Kernel, AutoGen, Azure AI Foundry, Azure OpenAI Service, Azure AI Search, Azure AI Speech, Azure AI Vision, Azure AI Language, Azure Machine Learning
2mo
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Sr. Full Stack Developer I (6440)
Washington, District of Columbia, United States
$133k-$142k/yr HybridFull Time
5+ YOEActive Secret clearance; Bachelor's in Computer Science or Engineering; 5+ years full stack development; React (TypeScript) and Python (FastAPI); REST APIs; OIDC/JWT; WCAG/508 accessibility; USWDS; DoD/federal experience preferred.
React, TypeScript, FastAPI, Python, ORM, OIDC/JWT, USWDS, CI/CD, REST APIs
1mo
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Full-Stack Developer - Mid-Senior, TS/SCI with CI Poly - $150K-$200K + 15% 401k
Fairfax, Virginia, United States
$150k-$200k/yr OnsiteFull Time
5+ YOEMid-Senior full-stack developer with TS/SCI clearance and CI poly, 5+ years in full-stack dev, containerization ( Docker/Kubernetes ), Rust/JS/Python/Java, Linux, CI/CD, strong communication.
Docker, Kubernetes, Helm, Rust, Relational databases, Git, GitLab, CI/CD
1mo
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Full Stack Developer
Chantilly, Virginia, United States
OnsiteFull Time
5+ YOE5–7+ years in full stack development; proficient in Java/C#/C++; modern JavaScript (React); REST APIs; databases (SQL, MongoDB); cloud (AWS/Azure); DevOps; Agile/Scrum.
Java, C#, C++, React, HTML, CSS, SQL, MongoDB, Elasticsearch, Python, R, AWS, Azure, REST, API, IaC, DevOps, Terraform, Docker, Kubernetes
5d
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AI Staff Engineer (SW Engineer IV+)
Philadelphia or Boston or New York City or Baltimore or Washington D.C. or Charlotte or Raleigh-Durham or Atlanta or Chicago
$170k-$220k/yr HybridFull Time
8+ YOE8+ years software engineering; experience with Python/JS/TS; data pipelines; AI/ML production; cloud-native systems (AWS); strong cross-functional collaboration.
Python, JavaScript/TypeScript, AWS, Databricks, Spark, Snowflake, AI/ML
4w
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Senior Data Scientist / ML Engineer
Washington or London
HybridFull Time
5+ YOE5+ years in predictive ML; expert in Python and Databricks; ML engineering; healthcare experience not required; strong data pipelines.
Databricks, Python
3w
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RPA Developer (Robotic Process Automation, Associate)
Arlington, Virginia, United States
$122k-$131k/yr HybridFull Time
7+ YOE7+ years relevant experience; federal process knowledge; 1-3 years in systems development or automated financial analysis; 1 year developing RPA bots with UiPath/Automation Anywhere/Blue Prism/Kofax; strong analytical and communication skills.
UiPath, Automation Anywhere, Blue Prism, Kofax, SQL, NoSQL, C#, VB, Python, JavaScript, Java, .NET, REST APIs
2mo
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Cleared Software Engineer - Microservices
Annapolis Junction, Maryland, United States
$185k-$230k/yr OnsiteFull Time
12+ YOE12+ years of professional experience or 10+ years with a related Master’s degree; strong Java Spring Boot, AWS, Python, CI/CD, and Agile experience.
Java, Spring Boot, Python, AWS, Lambda, Step Functions, EC2, S3, Maven, GitLab, GitOps, Kubernetes, Docker, Ansible, MongoDB, DynamoDB, Cypress, Cucumber, OSS, CloudWatch
1w
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Software Engineer (API)
Linthicum Heights, Maryland, United States
HybridFull Time
7+ YOESeven years of SWE experience; BS in Computer Science or related field; Python; Django or Flask; MongoDB/MariaDB; REST endpoints; microservices.
Python, Django, Flask, MongoDB, MariaDB, REST, JSON, Docker, AWS, Jira, Confluence, Git
3w
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Software Engineer 2
Annapolis Junction or Hanover
$50k-$290k/yr OnsiteFull Time
The Swift Group: Providing engineering and cybersecurity services for national security missions.
14+ YOELinux, C++, Java, scripting (Shell, JavaScript, Bash, Python), networking, Git, Docker; 14+ years exp with software engineering or 19+ years exp in lieu of degree; US citizenship with TS/SCI poly clearance.
Linux, C++, Java, Scripting languages, Socket programming, Git, Docker, Python
4w
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Sr. Innovation Software Engineer
Minnetonka or Austin or Chicago or Easton or Dallas or Detroit or Hagerstown or Atlanta or Houston or Akron or Birmingham or Charlotte or Indianapolis or Pittsburgh or Cincinnati or Cleveland
$77k-$154k/yr OnsiteFull Time
8+ YOESenior software engineer with full-stack, AI-enabled solution delivery; 8-12 years of experience.
Java, Python, TypeScript/JavaScript, Vertex AI, Google Cloud
2mo
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DATABASE ENGINEER LEVEL 3
Fort Meade, Maryland, United States
OnsiteFull Time
10+ YOEActive TS/SCI with Polygraph; 10+ years DBE experience; BS degree (or 5 years DBE substitute); Python; MongoDB or MariaDB; Django or Flask; REST; Microservices.
Python, MongoDB, MariaDB, Django, Flask, REST, Microservices, Swagger, AWS, Docker, Visual Studio Code, JSON, XML, Jira, Confluence, Git, Agile
2mo
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Evergreen: Staff Software Engineer - (Lead Developer)
Washington, District of Columbia, United States
$140k-$157k/yr RemoteFull Time
10+ YOEBachelor's degree and 10+ years of engineering experience; expert-level in at least one stack; remote position; full stack development.
Full Stack, Java, JavaScript, React, Node.js, Python
2mo
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Staff Engineer, AI Core
Palo Alto or Miami or Washington or Durham or Toronto
HybridFull Time
Experience as a Staff Engineer or Senior Engineer shipping complex, large-scale consumer-facing mobile apps; strong backend and AI/ML data-pipeline experience; leadership and mentorship.
Flutter, AWS, Go, Java, Python, Clojure, Microservices, Event-driven
2mo
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Software Engineer Level 3
Annapolis Junction, Maryland, United States
OnsiteFull Time
20+ YOETS/SCI clearance with polygraph; 20 years SWE in programs/contracts; BS CS or related, 4+ years SWE subspecialty; Go/Python; Kubernetes; GitOps; Terraform; cloud automation.
Go, Python, Kubernetes, Helm, GitOps, Kafka, Terraform, Ansible
1mo
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Cleared AI/ML Software Engineer - Expert
Fairfax, Virginia, United States
$180k-$240k/yr OnsiteFull Time
10+ YOE10+ years software development, 5+ years AI/ML, TS/SCI with poly clearance, strong Python/Java/JS/C/C++, AWS, ML frameworks.
Python, Java, JavaScript, C++, Rust, PyTorch, TensorFlow, Scikit-learn, SQL, NoSQL, REST, GraphQL, Linux, AWS
4w
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Senior Security Engineer, Detection and Response
New York or Washington
RemoteFull Time
7+ YOEBachelor's in CS/Info Security or related; 7+ years in information security with 3+ years in detection/response; strong AWS security and IaC skills; proficient in Python/TypeScript/Go; good communication and leadership.
AWS, Terraform, AWS CloudFormation, Python, TypeScript, Go, SIEM
3h
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Senior Data Engineer
Rockville, Maryland, United States
$115k-$130k/yr RemoteFull Time
6+ YOEBachelor’s degree in Computer Science or Information Systems; 6+ years data engineering; Snowflake/Azure; ETL/ELT; SQL; data lakes/warehouses; Power BI/Tableau/Sisense; secure data transfers; governance.
Azure SQL, Snowflake, Power BI, Sisense, Looker, Tableau, SFTP, Apache Kafka, Apache Spark, Talend, Informatica, GitLab, Azure DevOps, Jenkins, Airflow, Apache NiFi, Azure Data Factory, Python, Java, SQL
2w
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Sr. Solutions Engineer
Reston, Virginia, United States
$150k-$200k/yr RemoteFull Time
10+ YOEFull-time role requiring 10+ years IT experience, US citizenship for clearance, Bachelor’s degree, willing to travel to Reston, VA; capable of full-stack development and modern tech
React, Python, Node.js, PowerPlatform, AI/ML, LLM APIs, AWS, Azure, GCP
HiringCafe market data
Senior Python Developer Jobs market signals in Leesburg, VA, US
These signals come from live HiringCafe job inventory, not a static article. Use them to compare the market, then open listings above to apply directly.
Open jobs
2,200+
Hiring companies
510+
Fresh sample
38% new in 30d
Salary visibility
59% show pay
Companies appearing in this market
EOA TechnologiesM.C. DeanMetroStarSpaceXThe Swift GroupGeneral Dynamics Mission SystemsAmerican Bureau of ShippingAnalytica
Work location mix in visible results
Onsite: 44Hybrid: 20Remote: 4