173 sr api developer jobs at 98 companies in Hanover, PA
1mo
Save
Mark Applied
Hide
Senior Backend API Engineer
Linthicum, Maryland, United States
OnsiteFull Time
7+ YOEActive TS/SCI with polygraph required; 7+ years backend development experience with Python, RESTful APIs, Django/Flask, Docker, MariaDB/MongoDB; experience with Git, Jira, Confluence; strong troubleshooting and communication skills.
Python, Django, Flask, MariaDB, MongoDB, JSON, XML, Docker, Git, Jira, Confluence, AWS
1w
Save
Mark Applied
Hide
API Technical Lead
Baltimore, Maryland, United States
OnsiteFull Time
Design and implement FHIR/HL7 APIs and enterprise integration solutions, guide architecture and standards, mentor teams, and ensure scalable, secure interoperability.
FHIR, HL7, HL7v2, X12, JSON, XML, AWS, SOA
3mo
Save
Mark Applied
Hide
Software Engineer 1 (API)
Linthicum Heights, Maryland, United States
$52-$107/hr OnsiteFull Time
7+ YOEU.S. citizenship and Top Secret/SCI clearance with appropriate polygraph required; 7 years SWE experience; Bachelor’s in Computer Science (or 4 additional years of SWE experience); strong Python, Django/Flask, ReST, and database skills.
Python, Django, Flask, MariaDB, MongoDB, PostgreSQL, ReST, JSON, XML, Swagger, AWS, Docker, Visual Studio Code, Jira, Confluence, Git
1mo
Save
Mark Applied
Hide
Sr Software Developer
Fort Meade or Columbia
$174k-$220k/yr OnsiteFull Time
Expert in Java, JavaScript, and Python; experienced in AWS serverless (API Gateway, Lambda, Secrets Manager, Parameter Store, Step Functions), DynamoDB/Aurora PostgreSQL, CI/CD (Jenkins, GitHub, CodePipeline), Agile, corporate authentication integration, caching, and multi-source data integration.
Java, JavaScript, Python, AWS, API Gateway, Lambda, Secrets Manager, Parameter Store, Step Functions, DynamoDB, Aurora PostgreSQL, PostgreSQL, Jenkins, GitHub, CodePipeline, Jira, Confluence, Angular, Vue
1mo
Save
Mark Applied
Hide
Sr Aderant Engineer
Reston or San Diego or San Francisco or Washington or Wilmington or Phoenix or Los Angeles or Houston or Boston or Austin or Atlanta or Raleigh or Baltimore or New York or Dallas or Palo Alto or Short Hills or Minneapolis or Chicago or Seattle or Philadelphia or Miami
$113k-$179k/yr HybridFull Time
5+ YOE5+ years supporting Aderant Expert and enterprise financial/practice management systems, strong backend development and SQL skills, experience with integrations/APIs, bachelor's in CS/IT, analytical and troubleshooting ability.
Aderant Expert, SQL, APIs
1w
Save
Mark Applied
Hide
Sr. Full Stack Engineer
Baltimore, Maryland, United States
$135k-$186k/yr RemoteFull Time
8+ YOE8+ years relevant experience (or 6+ with Master’s) building full-stack web apps with SQL and Python, AWS deployment/monitoring, RESTful APIs, CI/CD, and secure coding; must be U.S. eligible for Public Trust.
SQL, Python, AWS, PostgreSQL, Aurora, S3, Secrets Manager, SSM, Jenkins, AWS CloudWatch, Splunk, RESTful APIs
6d
Save
Mark Applied
Hide
CNO Focused Sr. Software Engineer
Annapolis Junction, Maryland, United States
$120k-$247k/yr OnsiteFull Time
12+ YOERequires production-grade Python, 12+ years experience (or BS+8yrs), TS/SCI with polygraph, experience in CNO domain, API integration, git, Jira/Confluence, stakeholder interaction, and presenting analysis.
Python, git, Jira, Confluence, AWS, Docker, Kubernetes, LLMs
1mo
Save
Mark Applied
Hide
Sr. Application Developer - ServiceNow
Laurel, Maryland, United States
$108k-$184k/yr OnsiteFull Time
6+ YOE6+ years ServiceNow development/admin (or 10+ years with HS), experience with JavaScript, Glide API, REST/SOAP integrations, ServiceNow modules and Studio, Service Portal frameworks, strong communication and analytical skills, and on-call availability.
ServiceNow, ServiceNow Studio, ServiceNow Automated Test Framework (ATF), JavaScript, Glide API, Business Rules, UI Policies, Client Scripts, HTML, CSS, XML, REST, SOAP, AngularJS, React, Flow Designer, IntegrationHub, IDE, LDAP, SSO
3w
Save
Mark Applied
Hide
Sr. Software Engineer (TS/SCI)
Hampton or Annapolis Junction or Alexandria or Chantilly or Washington or Reston or McLean or Herndon or Bethesda or Catonsville or Frederick or Ashburn
$144k-$268k/yr HybridFull Time
4+ YOEU.S. citizen with TS/SCI clearance (or immediate DISS eligibility), Bachelor’s degree, 4+ years Python or Java, hybrid cloud/app development, databases, ETL, algorithm design, CI/CD and stakeholder interfacing.
Python, Java, MongoDB, Celery, Azure DevOps, Jenkins, React.js, Node.js, Web API, IBM CPLEX, Gurobi, SPSS, SAS, R, PyCharm, VS Code, Jupyter Notebooks, Pandas, NumPy, Dask, Matplotlib, Seaborn, Plotly, Git, GitHub, GitLab, Docker, Podman
1w
Save
Mark Applied
Hide
AI Automation Engineer / Developer
Frederick, Maryland, United States
OnsiteFull Time
Strong software development skills (e.g., Python, JavaScript/TypeScript), hands-on experience with AI tools (Claude) and automation, API integration experience, discretion with confidential client data, and ability to deliver production systems.
Claude, Python, JavaScript, TypeScript, APIs
1mo
Save
Mark Applied
Hide
Software Engineer
Annapolis Junction, Maryland, United States
$96-$108/hr OnsiteFull Time
14+ YOEExperience developing complex software systems using Java and Spring Boot, Linux, web services/APIs, SQL, Git, and container technologies; TS/SCI with polygraph required.
Java, Spring Boot, Linux, API, SQL, Git, Docker, JavaScript, ReactJS, Apache Kafka, Apache NiFi, Docker Compose, Maven, Jira, Confluence, Atlassian
1w
Save
Mark Applied
Hide
Software Engineer
Hunt Valley, Maryland, United States
$86k-$115k/yr HybridFull Time
5+ YOEBachelor's degree in computer science or related field, 5+ years software engineering experience, API and full-stack development experience, familiarity with Agile, testing, and cloud paradigms.
.NET (C#), SQL, HTML, CSS, JavaScript, NodeJS, Angular, React, Vue, Azure DevOps, Git, MS SQL Server, Typescript, REST API, HTTP, Java
2mo
Save
Mark Applied
Hide
Senior React Developer
Annapolis Junction or Columbia
$200k-$275k/yr HybridFull Time
12+ YOESenior full-stack developer proficient in React and Java/Spring Boot; experience migrating legacy systems; ability to work with Camunda and Pega workflows; strong REST APIs and Oracle/SQL skills.
React, Java, Spring Boot, Camunda, Pega, Oracle, SQL, REST API
2d
Save
Mark Applied
Hide
Full Stack Engineer
Boston or Woodlawn or Dallas
$97k-$133k/yr HybridFull Time
1+ YOERequires one year of specialized experience equivalent to GS-11 developing APIs, software applications, and system integrations; collaborating across teams; and demonstrating core IT competencies.
HTML5, CSS3, JavaScript, MySQL, PostgreSQL, MongoDB, Application Programming Interfaces (APIs), USAJOBS, USA Hire, Microsoft Outlook
2mo
Save
Mark Applied
Hide
Sr. Data Analyst- Salesforce Developer
Columbia, Maryland, United States
HybridFull Time
Bachelor's degree or equivalent; experience with Salesforce development (Apex, Lightning), BI reporting, SQL, and integrations; strong analytical, communication, and Agile delivery skills; U.S. work-authorization and Public Trust eligibility required.
Salesforce, Apex, Lightning, SQL, Tableau, Power BI, APIs
6d
Save
Mark Applied
Hide
Agile Developer 3
Annapolis Junction, Maryland, United States
OnsiteFull Time
9+ YOEActive TS/SCI with Full Scope Poly required; 9 years relevant experience (7 with Master's); experience with microservices, API, Lambda, RDS, Grafana, Prometheus, MongoDB, DocumentDB; ability to support 24x7 on-call.
microservices, API, Lambda, RDS, Grafana, Prometheus, MongoDB, DocumentDB, Java, Spring Boot, Python, AWS, CI/CD
1mo
Save
Mark Applied
Hide
ServiceNow Developer
Dallas or Washington or Columbia or United States
RemoteContract
5+ YOEBachelor's degree and 5+ years ServiceNow developer/administrator experience; strong JavaScript and SQL skills; ServiceNow ITSM, Flow Designer, Integration Hub, REST API, CMDB, and platform administration experience.
ServiceNow, ITSM, CMDB, Service Catalog, Flow Designer, Integration Hub, Business Rules, Script Includes, Client Scripts, UI Policies, UI Actions, Scripted REST APIs, Import Sets, Transform Maps, ACLs, Performance Analytics, Reports, Dashboards, JavaScript, SQL, Python, HTML, CSS, React, Node.js, Express.js, REST APIs, JSON, XML, PostgreSQL, MongoDB, AWS (EC2, RDS, S3), Git, Postman, VS Code
1mo
Save
Mark Applied
Hide
Sr Full Stack Software Engineer
Chicago or Washington or Baltimore or Louisville or Dallas or Frisco or Kentucky
$107k-$147k/yr RemoteFull Time
4+ YOEBachelor's in CS or equivalent, 4+ years software engineering including Python, 2+ years with Angular/React/Vue or Java/Node.js, cloud and microservices experience, REST API and testing skills.
Java, JavaScript, HTML, PHP, C#, Python, Angular, React, Vue.js, Node.js, Microsoft Azure, AWS, Google Cloud Platform (GCP), Kubernetes, REST APIs, SASS, W3C Web Standards
1w
Save
Mark Applied
Hide
Salesforce Developer
United States or Baltimore or Washington
$110k-$130k/yr RemoteFull Time
6+ YOEUS citizen or permanent resident with public trust eligibility, 6+ years software development, 5+ years Salesforce hands-on experience, Apex/Visualforce/Lightning, API and MuleSoft integrations, CI/CD and DevOps experience.
SOAP, REST, MuleSoft, Apex, Visualforce, Lightning Components, Force.com, Service Cloud, Community Cloud, App Cloud, Ajax, JavaScript, Angular JS, Bootstrap, ANT, GitHub, DevOps CI/CD Pipelines, Jenkins, Azure DevOps, Microsoft Word, Microsoft Excel, Microsoft PowerPoint
1w
Save
Mark Applied
Hide
User Interface Developer
Columbia, Maryland, United States
$140k-$217k/yr HybridFull Time
5+ YOE5+ years UI development experience with Angular 20+, TypeScript, HTML, CSS, RESTful APIs; active US security clearance with polygraph required.
Angular 20+, TypeScript, HTML, CSS, RESTful APIs, NX Smart Monorepos, Section 508, Pega Constellation UI