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  • Principal Engineer, API & MCP Platform

     ...is partnering with Babel Street to find a Principal Engineer, API & MCP Platform . Please see details below: About the Role...  ...and delivering API-first platform capabilities that enable both developers and AI agents to interact with Babel Street’s services. You will... 
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    Hatch IT

    Reston, VA
    a month ago

  • Python / API Developer

     ...Python Developer/Software Engineer McLean VA (Onsite Hybrid Model) 12 Months | Extension Possible Job Description: Must Haves: Looking for a Python API Developer. Must have Python, Flask, SQL, Pandas, NumPy & Pytest, Unitest, Monkey patch. Experience... 
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    Samprasoft

    McLean, VA
    3 days ago

  • Senior Cloud Integration Architect — API & Microservices

    $150k - $180k

    Steampunk is looking for an Integration Architect in McLean, Virginia. This role involves developing APIs and integration capabilities to help clients achieve their mission. Responsibilities include understanding stakeholder needs, creating APIs, and ensuring system security... 
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    Steampunk

    Mc Lean, VA
    13 hours ago

  • Senior Cloud API & Integration Architect

    $150k - $180k

    Steampunk in McLean, Virginia, is seeking a Senior Integration Architect to enhance our DevSecOps practice. This role focuses on developing APIs and integration solutions to connect various services and data efficiently. Candidates should have a strong background in cloud... 
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    Steampunk

    Mc Lean, VA
    4 days ago

  • Senior Cloud API & Integration Architect

    $150k - $180k

    Steampunk is seeking an experienced Integration Architect based in McLean, Virginia. In this role, you will develop APIs, microservices, and handle integrations within our DevSecOps practice. The ideal candidate has 8 years of experience with cloud platforms like AWS and... 
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    Steampunk

    Mc Lean, VA
    13 hours ago

  • Web Application / API Services Developer - Senior Level (FI3)

     ...Job Description Job Description Web Application / API Services Developer – Senior Level (FI3) Job Description: Are you opinionated on what it takes to create great software AND great teams? Are you interested in using your experience to help others grow in... 
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    Flexible hours

    Trinity ES LLC

    Herndon, VA
    24 days ago

  • Mobile Application Developer *

     ...looking to take the next steps in your career as a Mobile Application Developer? Let's chat and see if we are a good match! Opportunity:...  ...experience in both Front-end Mobile and Back-end RESTFUL API development. Requires experience in development of JAVA, Node... 
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    2 days per week

    Virtual Service Operations

    Ashburn, VA
    17 days ago

  • Low-Latency Backend Engineer: Target Tracking & APIs

     ...candidate, active, timeout, split/merge) Build and maintain REST APIs with strict latency SLOs (sub-20ms update paths) Implement persistent storage using MySQL and long-term archival in ClickHouse Develop composite fingerprint matching algorithms with policy-weighted... 
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    Digital Global Systems Inc

    Mc Lean, VA
    13 hours ago

  • Software Engineer (Front-End) / APIS

     ...threat detection, and analytics systems. In this role, youll develop responsive front-end applicationsand integrate with C#/.NET...  ...engineer looking to deepen expertise in modern front-end frameworks, API integration, and enterprise-grade systems. What Youll Do... 
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    Securiport

    Reston, VA
    7 days ago

  • Software Tester / QA Engineer (Web & API Testing)

     ...(TS/SCI w POLY REQUIRED) Software Tester / QA Engineer (Web & API Testing) We are seeking a detail-oriented and technically skilled...  ...as Postman and Swagger to test, document, and validate APIs Develop and maintain automated test scripts using frameworks such as... 
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    Falls Technology

    Chantilly, Loudoun County, VA
    a month ago

  • MuleSoft API & Cloud Integrations Engineer

    $85k - $170k

    Steampunk is looking for a Mulesoft Developer to join our DevSecOps practice in McLean, Virginia. The successful candidate will develop APIs and integrations using the Mulesoft platform, ensuring systems are functional and secure. The role requires a B.S. in IT or equivalent... 
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    Steampunk

    Mc Lean, VA
    4 days ago

  • User Interface Developer

     ...Job Title: User Interface (UI) Developer Location: Ashburn, VA, 2 times a week Industry: Technology Date Opened: 07/23/2025 Job...  ...Collaborate closely with Java backend developers to understand API requirements and ensure seamless integration. Drive thorough... 
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    CMCI

    Ashburn, VA
    16 days ago

  • User Interface (UI) Developer

     ...User Interface Developer We are seeking an experienced User Interface (UI) Developer to lead the design and development of scalable,...  ...practices Collaborate with backend developers to integrate RESTful APIs and microservices Own and implement scalable front-end... 
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    Novul Solutions

    Ashburn, VA
    1 day ago

  • Full Stack API Developer- TS/SCI with Polygraph

    $187k - $253k

     ...related experience US Citizenship Required: Yes Job Description: Deliver simple solutions to complex problems as an Full Stack API Developer at GDIT. Here, you’ll tailor cutting-edge solutions to the unique requirements of our clients. With a career in application development... 
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    General Dynamics Information Technology

    Chantilly, Loudoun County, VA
    1 day ago

  • .NET Developer (Application Support Engineer)

     ...infrastructure tasks (SSL certificates, deployments) Tech Stack Primary:.NET, C#, Windows desktop (WinForms / WPF) Adjacent: SQL, REST APIs, data feeds & integrations, SSL/TLS What We're Looking For • 3+ years of .NET development experience • Patience for... 
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    C2 Essentials

    Ashburn, VA
    1 day ago

  • Senior Full Stack Java Developer

     ...Service Refunds, and Bulk Claim. The bulk claim submission API initiative provides an automatic data pipe, besides the current...  ...for collaborating on mainframe integration with Java developers and migration planning. · Ability to work independently and in... 

    Nextgen IT Services 1099

    Ashburn, VA
    14 days ago

  • Sr. Full Stack Java Developer (Hybrid)

     ...Job Description Job Description Sr. Full Stack Developer – Java Ashburn, VA (Hybrid – 1 day onsite / 4 days remote) Must be a U....  ...Boot, Spring MVC, Spring Security (DI & AOP experience) RESTful API design (versioning, standards, documentation) Angular (deep... 
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    Immediate start
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    Macro Solutions

    Ashburn, VA
    7 days ago

  • Front-end Developer

     ...Description: C. Mack Solutions is seeking a talented frontend developer to build modern, intuitive web applications. The ideal candidate...  ...requirements into interactive features. Integrate RESTful APIs and manage complex application state. Optimize for performance... 

    C. Mack Solutions, LLC

    Ashburn, VA
    26 days ago

  • Mid - level Full Stack Developer

     ...Full Stack Java Developer (Mid-Level) We are seeking a Full Stack Java Developer (Mid-Level) to support a high-impact federal program...  ...technologies: Kafka, ActiveMQ, SQS, SNS Web services and REST API development In-memory data stores: Redis, Memcached, Elasticache... 
    Immediate start
    Flexible hours

    Novul Solutions

    Ashburn, VA
    2 days ago

  • Salesforce Developer - On Site

     ...senior technical leadership on impactful programs Salesforce Developer (Health Cloud) Location: Ashburn, Virginia Clearance/...  ...between Salesforce and external enterprise systems using REST/SOAP APIs and modern data exchange patterns Troubleshoot complex... 
    Flexible hours

    Falls Technology

    Ashburn, VA
    4 days ago

  • API Developer

     ...Job Description Job Description Description LT Consulting is looking for an API developer to develop custom solutions for our clients. The role will focus on back end development using a variety of software languages. This position is located in Northern Virginia... 

    LT Consulting

    Chantilly, Loudoun County, VA
    1 day ago

  • C#/.Net Developer

     ...Description Syms Strategic Group (SSG)  is seeking a talented C#/.Net Developer Location: Remote Department: Veterans Affairs (VA)...  ...State Transfer Application Programming Interface (RESTful APIs) and other APIs Proficiency in database design and development... 
    Full time
    Remote work

    Syms Strategic Group, LLC (SSG)

    Ashburn, VA
    12 days ago

  • Full Stack Developer *

     ...looking to take the next steps in your career as a Full Stack Developer? Let's chat and see if we are a good match! Opportunity:...  ...principles ~2+ years experience with Microservices/RESTful APIs ~ Expertise with Axios framework to work with rest services.... 
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    2 days per week

    Virtual Service Operations

    Ashburn, VA
    17 days ago

  • Full Stack Developer

     ...Description Overview BigBear.ai is seeking a Full Stack JAVA/JEE Developer for a multi-year contract to support the ongoing modernization...  ...stakeholders. JavaScript, Vue.js, C#, .NET Core, Web API, Visual Studio code, Harness, Gitlab, xUnit, SonarQube AWS experience... 
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    Bigbear.ai

    Ashburn, VA
    2 days ago

  • Lead Systems Engineer/Architect

     ...rendering ~ Architect the integration of existing platform components into a unified, production-grade system ~ Design extensible APIs and SDKs enabling third-party connector development ~ Architect edge deployment patterns for disconnected, intermittent, and low... 

    Brightline Interactive

    Ashburn, VA
    27 days ago

  • API Developer

     ...API Developer LOCATION Reston, VA 20190 CLEARANCE TS/SCI Full Poly (Please note this position requires full U.S. Citizenship) KEY SUMMARY We are seeking a talented API Developer to join our team and play a key role in designing, building, and maintaining... 
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    Cymertek

    Reston, VA
    13 hours ago

  • API developer with Tenable

    $110k - $150k

     ...Job Title: API developer with Tenable Location: McLean, VA Type: Contract To Hire Compensation: $110,000.00 - $150,000.00 Contractor Work Model: Hybrid – onsite and remote Responsibilities Develop and maintain custom connectors between Tenable and... 
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    System One Holdings, LLC

    McLean, VA
    13 hours ago

  • Senior Salesforce Developer

     ...Apply today! Niyam is seeking an experienced Senior Salesforce Developer for one of our federal clients. The Senior Salesforce...  ...External Systems - Develop and maintain integrations using REST/SOAP APIs, middleware, and platform events. Collaborate with... 
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    NiyamIT Inc.

    Ashburn, VA
    3 days ago

  • Senior Salesforce Developer

    $112.8k - $173.6k

     ...is seeking a highly skilled and experienced Senior Salesforce Developer to join our dynamic team. As a Senior Salesforce Developer, you...  ...development but integrating with other systems via common APIs. Responsibilities : Collaborate with stakeholders to... 
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    Zayo Group

    Ashburn, VA
    1 day ago

  • Java Software Engineer

     ...Description: The Java Software Engineer must be able to design, develop, enhance, debug, and implement software in an Agile environment....  ...interfaces and back-end services, including integration with APIs, cloud platforms, and complex data systems. Responsibilities... 
    Work experience placement

    C. Mack Solutions, LLC

    Ashburn, VA
    7 days ago