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33 javascript react developer jobs at 17 companies in Lancaster, PA

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Lead Software Engineer - Java, React, AWS
Jersey City or Wilmington or Columbus
$152k-$215k/yr OnsiteFull Time
JPMorgan Chase
JPMorgan ChaseNYSE: JPM: Global financial services firm providing banking and investment solutions.
5+ YOE5+ years software engineering experience; expertise in distributed system design, cloud-native architectures (AWS), API design (GraphQL/REST), and technical leadership; strong coding skills in Java/JavaScript/TypeScript/Python.
Java, JavaScript, TypeScript, Python, GraphQL, REST, AWS, ECS/Fargate, SNS, SQS, Lambda, API Gateway, S3, Terraform, PostgreSQL, Lucene, Hugo, Artifactory, Bitbucket, GitHub, Module Federation, Go, ADFS, MCP
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Contract Associate Development Engineer
Hunt Valley, Maryland, United States
$82k/yr OnsiteContract, Full Time
Sinclair
SinclairNASDAQ: SBGI: Operates television stations and produces news and sports programming
0.5+ YOEBachelor's in CS or equivalent experience, ~6 months application/web development, proficiency with JavaScript/Java/Node.js/React/Python/SQL/NoSQL, familiarity with CI/CD and cloud-native architectures.
JavaScript, Java, Express, Node.js, MySQL, MongoDB, Mongoose, Python, ReactJS, jQuery, HTML5, CSS, CI/CD, IAC, AWS, Databricks, Docker, Kubernetes, Terraform
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Engineer
Malvern, Pennsylvania, United States
$110k-$130k/yr OnsiteFull Time
Tata Consultancy Services
Tata Consultancy ServicesNational Stock Exchange of India: TCS: Global provider of IT services, consulting, and business solutions.
10+ YOEStrong React, HTML, CSS, JavaScript/TypeScript, GitHub, CI/CD, and automated testing (Playwright); 10+ years experience; bachelor in computer science required.
CSS, HTML, React, JavaScript, TypeScript, GitHub, CI/CD, Playwright
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Senior AI Engineer
United States or Wilmington
$126k-$197k/yr RemoteFull Time
Chemours
ChemoursNYSE: CC: Manufactures specialty chemicals, refrigerants, and high-performance industrial fluoropolymers.
8+ YOEDegree in Computer Science/Engineering, 8+ years backend development with Python and JavaScript, 2+ years production GenAI systems experience, React/TypeScript UI skills, Pydantic proficiency, strong stakeholder communication.
Python, JavaScript, React.js, TypeScript, HTML, Pydantic, PyTorch, Azure, Azure Kubernetes, Office 365, GitHub
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Software Engineer I
Reading or Tampa
OnsiteFull Time
Penske Truck Leasing: Provides commercial truck leasing, rental, and vehicle maintenance services.
5+ YOEBachelor's in CS/CE or equivalent, 5+ years programming (Java, RPG, etc.), full‑stack experience (React/Angular/HTML/CSS/JavaScript), REST/myBatis/Spring, relational DB design, Agile, and strong communication.
Java, RPG, React, Angular, jQuery, HTML, JavaScript, CSS, Spring framework, Spring-MVC, myBatis, RESTful API’s, Agile, DevOps Tools, CI/CD
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Sr. Software Developer
Mechanicsburg, Pennsylvania, United States
$100k-$105k/yr OnsiteContract
Connected Logistics
Connected Logistics: Provides IT and logistics services for government defense agencies.
10+ YOE10+ years professional software development experience; strong expertise with C#, VB.NET, .NET 8+, ASP.NET Core, JavaScript and modern front-end frameworks, SQL/Entity Framework, microservices, messaging, Git; U.S. citizen with current T3 investigation; onsite work required.
C#, VB.NET, .NET 8+, ASP.NET Core, JavaScript, React, Angular, SQL, Entity Framework, NServiceBus, RabbitMQ, Git
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Staff Software Engineer - Level 4
King of Prussia, Pennsylvania, United States
$114k-$227k/yr OnsiteFull Time
Lockheed Martin
Lockheed MartinNYSE: LMT: Designs and manufactures global security and aerospace systems.
US citizen able to obtain TS/SCI clearance; recent full‑stack development experience with JavaScript/Node.js/Java and JS libraries; CI/CD, containerization, cloud, Agile, testing familiarity; bachelor’s degree or equivalent.
GitLab, Kubernetes, Docker, Rancher, JavaScript, Node.js, Java, Lit, React, Angular, Git, Git Bash, Helm, AWS, Azure, OpenStack, OpenShift, Jira, Confluence, Spring Boot, Quarkus, HTML, CSS, Playwright, Cucumber, PostgreSQL, MySQL
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SENIOR SOFTWARE DEVELOPER/ENGINEER (CLOUD/CYBER)
Huntsville or Aberdeen or Colorado Springs or Crestview or Tupelo
OnsiteFull Time
Sentry Construction
Sentry Construction: Provides general contracting and comprehensive property maintenance services.
7+ YOEBS in CS/Software Eng or equivalent, 7+ years software development experience, DoD Top Secret/SCI eligibility, experience with Python, containers, AI/LLMs, databases, Linux, AWS, and Agile/Scrum.
LLMs, Ollama, LM Studio, Python, C#, Go Lang, React, JavaScript, HTML, CSS, Git, Docker, Bash, TensorFlow, PyTorch, SQL, MongoDB, PostgreSQL, Redis, Linux, AWS, RESTful API, Agile/Scrum
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Associate Software Developer
West Chester, Pennsylvania, United States
HybridFull Time
Venerable
Venerable: Manages and optimizes legacy variable annuity business blocks.
1+ YOE1+ years professional experience in AI/ML and micro-service systems; proficiency with AWS services, Python, C#, ML libraries, and enterprise software development practices.
SageMaker, Lambda, EC2, S3, EFS, SNS, SQS, EventBridge, Kinesis, Aurora, DynamoDB, RDS Proxy, Glue, Athena, Redshift, AWS Step Functions, AWS CodePipeline, Python, TensorFlow, PyTorch, scikit-learn, C#, PowerShell, SQL, JavaScript, UML, Docker, Git, GitHub, Jenkins, Bamboo, TeamCity, SpecFlow, Cucumber, Protobufs, Thrift, Avro, JSON, ODBC, Kafka, Angular, React
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Senior Software Engineer
Wilmington, Delaware, United States
HybridFull Time
CSC
CSC: Provides global business administration and compliance solutions.
Strong C#/.NET Core development skills, front-end framework and JavaScript/TypeScript proficiency, experience with Entity Framework Core, SQL Server, Azure Functions, AI-assisted tools, and test automation.
C#, .NET Core, Blazor Server, Blazor WebAssembly, GitHub Copilot, Cursor, Claude Code, Entity Framework Core, SQL Server, Azure Functions, Bootstrap, Playwright, MediatR, Fluxor, Polly, Docker, Kubernetes, Artillery, JMeter, K6, Locust, Azure AI Foundry, Azure OpenAI Service, Git, React, Angular, Vue, JavaScript, TypeScript
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Full Stack Java/Cloud Developer - Assistant Vice President
New Castle, Delaware, United States
$107k-$161k/yr HybridFull Time
Citi
CitiNYSE: C: Providing global banking, investment, and wealth management services.
5+ YOE5-8 years large-scale application development experience with Java, Spring, microservices, SQL, cloud platforms, CI/CD, Git, and Oracle; Bachelor’s in CS or equivalent experience.
Java EE, SQL, Spring, JavaScript, Bootstrap, ReactJS, Azure, AWS, CI/CD, DevOps, Oracle, Git, Maven
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Software Development Manager
Sparks, Maryland, United States
$165k-$180k/yr HybridFull Time
Healing Partners
Healing Partners: Provides specialized wound care services to skilled nursing facilities.
8+ YOE3+ Mgmt8+ years software development, 3+ years people management, hands-on with JavaScript/TypeScript, React, Node.js, CI/CD, cloud operations; strong leadership, communication, and incident response skills.
JavaScript, TypeScript, React, Node.js, Express, HTML, CSS, REST APIs, MongoDB, SQL Server, MySQL, PostgreSQL, Microsoft Azure, Linux, Git, SFTP, CI/CD
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2mo
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Full Stack Software Engineer
King of Prussia, Pennsylvania, United States
$90k-$190k/yr OnsiteFull Time
CACI
CACINYSE: CACI: Provides information technology and professional services to government clients.
5+ YOE5+ years in OO languages with Python; 2+ years in JavaScript/TypeScript; TS/SCI with Poly; BS in CS; full SDLC; cloud, APIs; in-office.
Python, JavaScript, TypeScript, RESTful APIs, AWS, Azure, Kubernetes, React, Angular, Git, GitLab, Jira, Confluence
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5d
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Quality Assurance Engineering - Sr Professional II
King of Prussia or Alpharetta or Jacksonville
OnsiteFull Time
Fiserv
FiservNew York Stock Exchange: FI: Provides financial technology and payment processing services to institutions.
3+ YOE3+ years SDET/test automation experience; build end-to-end, API, regression, and performance tests; proficiency with JavaScript/TypeScript, API testing, CI/CD, Docker/Kubernetes; strong communication and critical thinking.
Docker, Kubernetes, GitLab, Cypress, Playwright, JMeter, Gatling, Postman, JavaScript, TypeScript, Selenium, React, Go, Jira, Confluence
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Application Engineering Technical Lead - II
Malvern or Charlotte
HybridFull Time
Vanguard
Vanguard: Provides mutual funds, ETFs, and investment management services.
8+ YOE8+ years technology experience with 3+ years software development; strong AWS, cloud-native, microservices, and observability skills; Node.js/TypeScript/Java/Python experience; mentoring and architecture leadership.
CloudFront, S3, ECS, Fargate, IAM, Lambda, DynamoDB, SQS, SNS, Step Functions, Glue, Athena, CloudWatch, Node.js, TypeScript, JavaScript, Java, Spring Framework, Python, Angular, React, CSS, Jest, SQL, GitHub, Splunk, Honeycomb, Okta, GitHub Copilot, Claude Code
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Customer Relationship Management (CRM) Lead
Harrisburg, Pennsylvania, United States
OnsiteContract
Data-Core Systems
Data-Core Systems: Provides IT consulting, software development, and business process services.
10+ YOE10+ years Microsoft CE and CRM implementation experience; 10 years developing with .NET, JavaScript, Python, React, SSIS, and Reporting Services; FastTrack solution architect experience; Azure AI/ML and Copilot experience; data migration and integrations expertise; team leadership and documentation skills.
SAP BRIM, Microsoft Dynamics CE, Microsoft CE, .NET, JavaScript, Python, React, SSIS, Reporting Services, Azure AI, Machine Learning, Copilot, Microsoft Dynamics CRM, Dynamics Contact Center, Microsoft ADO Testing Module, Power Apps, CoPilot Studio, Microsoft D365 CE
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Software Architect
Malvern, Pennsylvania, United States
OnsiteFull Time
Akuvo
Akuvo: Provides AI-powered collections and credit risk software for financial institutions.
8+ YOE8+ years software development experience designing cloud-based distributed .NET solutions; strong front-end and SQL Server skills; Git workflow; excellent communication and problem-solving.
.NET, JavaScript, React, Vue, Angular, Microsoft SQL Server, Git, Microsoft Azure, CI/CD
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Computer Scientist (Job #718)
Aberdeen, Maryland, United States
OnsiteFull Time
Defense Acquisition Support Services
Defense Acquisition Support Services: Provides systems engineering and technical assistance to defense agencies.
8+ YOEActive DoD security clearance, Bachelors in CS/CE/Data Science, 8+ years experience, prior military or DoD program experience, DevSecOps familiarity, strong software development and integration skills.
React, React Native, HTML, JavaScript, TypeScript, eCharts, D3, PowerBI, Python, FastAPI, SQL, SQLite, Vantage, Foundry
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