75 api developer jobs at 47 companies in Mastic, NY
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Full Stack Developer (.NET API) - Senior Software Engineer
Stamford, Connecticut, United States
OnsiteFull Time
6+ YOEBachelor's in computer science or related field, 6+ years full-stack experience with .NET Core API, Angular and SQL Server, strong C#/Web API and front-end (HTML/CSS/JavaScript) skills, REST API experience, communication and leadership abilities.
Angular, .NET Core, SQL Server, C#, Web API, HTML, CSS, JavaScript, Microsoft Azure, Git
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Director, eCommerce Syndicated API Platforms
Stamford or St. Louis or Greenwood Village
HybridFull Time
10+ YOE3+ MgmtBachelor's degree or equivalent,10+ years in technical program delivery or API platforms,9+ years partner enablement,API strategy and integrations,leadership in launch planning and stakeholder alignment,strong API and developer experience skills.
REST APIs, API gateway, cloud-based platforms
1mo
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Middle Office Software Developer
Norwalk or Rowayton
$115k-$200k/yr OnsiteFull Time
5+ YOEBachelor's in computer science, 5+ years software development in financial services, experience with C#, Windows and web frameworks, SQL Server, messaging/SOA/APIs, Agile and unit/integration testing.
C#, Windows Forms, WPF, ASP.NET MVC, Angular, JavaScript, Web API, SQL Server, MOM, SOA, APIs, Agile, Coding agents and AI-assisted development tools
2mo
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Android Developer Experience Lead
Holtsville or Lincolnshire or Austin or Kennesaw
$139k-$208k/yr HybridFull Time
10+ YOELead Android Developer Experience; 10+ years with Bachelor's or 7+ years with Advanced Degree; Android platform expertise; API/SDK design; Java and Kotlin proficiency.
Android Studio, Gradle, Java, Kotlin, APIs, SDKs
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Senior Frontend Developer
Greenwich, Connecticut, United States
HybridFull Time
5+ YOE5+ years commercial SPA development experience; degree in CS or related; strong JavaScript/HTML/CSS skills; experience with Vue/React/Angular, TypeScript, webpack/Vite, API integration, and AI/agentic development tools.
Vue 3, TypeScript, VueJs, Vuex, Pinia, Vite, Cypress, webpack, React.js, Angular.js, Claude Code, JavaScript, HTML, CSS, LESS
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Sr. Software Engineer
Miami or Shelton
OnsiteFull Time
5+ YOEBachelor's or equivalent experience, 5+ years production software development, strong with Node.js/TypeScript/Java/C#, serverless AWS (Lambda, API Gateway, DynamoDB, SQS/SNS), REST/GraphQL APIs, CI/CD and Git workflows, Terraform/IaC, and daily use of AI-assisted development tools (GitHub Copilot, Claude).
AWS Lambda, API Gateway, DynamoDB, SQS, SNS, Node.js, TypeScript, JavaScript, Java, C#, Terraform, GitHub, Azure DevOps, Dynatrace, OpenAPI, Swagger, GitHub Copilot, Claude, Git, GitHub Actions, Datadog, CloudWatch, Akamai, CloudFront, OAuth 2.0, OpenID Connect, AWS Cognito, React Native
2w
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C# .NET Developer
East Haven, Connecticut, United States
OnsiteFull Time
2+ YOE.NET Framework/.NET Core and C# experience, Blazor, SQL Server (2016+), REST/SOAP, Visual Studio, Git, HTML/CSS/JavaScript, web API development, Agile experience.
.NET Framework, .NET Core, Blazor, C#, SQL Server 2016, ASP.NET, ADO.NET, REST, SOAP, Visual Studio, Git, HTML, CSS, JavaScript, JSON, AJAX, Wrike, Jira, bash, PowerShell, cmd
4d
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Senior AI Engineer
Greenwich, Connecticut, United States
OnsiteFull Time
Bachelor's degree or equivalent experience; enterprise technology integration, LLMs, generative AI, Python, GCP, APIs, SDLC, Agile, and secure production AI application experience required.
Large Language Models (LLMs), ADK, LangChain, Google Cloud Platform (GCP), Python, Vertex AI, Cloud Run, BigQuery, Retrieval-Augmented Generation (RAG), HRIS, CRM, ERP, APIs, SDLC, Agile
4d
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Senior AI Engineer
Greenwich, Connecticut, United States
OnsiteFull Time
Bachelor's degree or equivalent experience; enterprise technology and generative AI experience; Python, LLMs, orchestration frameworks, GCP, API integration, SDLC, Agile, and secure scalable application development.
Large Language Models (LLMs), ADK, LangChain, Google Cloud Platform, Vertex AI, Cloud Run, BigQuery, Python, Retrieval-Augmented Generation (RAG)
3w
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Business Process Analyst, UiPath Developer - Associate/ Assistant Vice President
Greenwich or New York City
$100k-$150k/yr HybridFull Time
3+ YOEBachelor's degree and 3+ years in business process analysis or RPA development with UiPath, REFramework, SQL, API integrations, Python or .NET, enterprise platform exposure, and strong communication skills.
UiPath Studio, UiPath Orchestrator, UiPath Assistant, REFramework, SAP, Salesforce, ServiceNow, SQL, Excel, API, Python, VB.NET, C#, Git, Docker, JIRA, Confluence, REST, SOAP, Postman, Microsoft Power Platform, UiPath Process Mining, Celonis, AWS
1mo
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Sr Software Development Engineer
Houston or Greenwich
$93k-$232k/yr HybridFull Time
10+ YOE10+ years software development experience; proficiency in .NET and/or Java; cloud (AWS/Azure) experience; hands-on coding, API and database design, CI/CD and Git; healthcare claims or analytics domain experience preferred.
.NET, Java, AWS, Azure, FHIR, HL7, CI/CD, Git
3w
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Software Engineer I
Grand Rapids or Uniondale or Austin or Atlanta
$100k-$150k/yr HybridFull Time
1+ YOE1+ year software engineering experience; strong skills in Python or JavaScript/TypeScript; familiarity with APIs, integrations, automated testing, debugging; comfortable with AI-assisted development (Claude Code preferred); onsite collaboration required.
Python, JavaScript, TypeScript, Claude Code
3mo
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SAP BTP (CPI/IS) Developer
Waltham or Brooklyn or Hicksville or Syracuse or Connecticut or New Jersey or New Hampshire or Pennsylvania or Rhode Island or Vermont or Maine
$111k-$158k/yr HybridFull Time
Experience developing SAP BTP/Integration Suite solutions (CPI/IS), strong scripting (Java, Groovy), XML/JSON/OData/SOAP/REST, API security, Git/Jira familiarity; bachelor's in CS/engineering preferred.
SAP BTP Integration Suite, CPI, PIPO, ALE/IDocs, BAPIs, XML, OData, SOAP, REST, Java, Groovy, JSON, Business Application Studio (BAS), SAP HANA Cloud, Git, Jira, SAP ABAP, Eclipse, CDS Views, Fiori, UI5, HTML5, Net weaver web services
1mo
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Sr Software Development Engineer
Houston or Greenwich
$93k-$232k/yr HybridFull Time
10+ YOE10+ years software development experience; hands-on coding in .NET and/or Java; cloud (AWS/Azure); claims adjudication or healthcare payments experience; API, FHIR/HL7, CI/CD and Git; database design and performance tuning; microservices and cloud-native architectures.
.NET, Java, AWS, Azure, FHIR, HL7, CI/CD, Git
3mo
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Senior Full Stack Developer
Milford, Connecticut, United States
OnsiteFull Time
5+ YOE5+ years full-stack development experience; bachelor\u0002s degree or equivalent; strong AWS, Node.js, PHP, Python, REST API, relational and NoSQL database, front-end (HTML5/CSS3/JavaScript), Git and CI/CD skills; strong communication.
AWS, EC2, S3, Lambda, RDS, CloudFormation, Node.js, Express.js, npm, PHP, Laravel, Symfony, Python, MySQL, PostgreSQL, NoSQL, HTML5, CSS3, JavaScript, Git, CI/CD, Docker, Kubernetes, Salesforce Apex
1d
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Software Engineer II-Hybrid Role
Greenwich, Connecticut, United States
HybridFull Time
2+ YOERequires 2–4 years of software development experience, a bachelor's degree or equivalent, proficiency in a core language/framework, RESTful APIs, relational databases, Git/GitHub, and strong analytical skills.
PHP, Laravel, Nova, Apiato, Java, C#, Python, Go, C++, JavaScript, React, Angular, jQuery, HTML5, CSS3, LESS, SASS, Material Design, Kotlin, Swift, Objective-C, React Native, Flutter, Retrofit, OkHttp, Firebase, MySQL, Oracle, Firebird, Amazon Web Services (AWS), Git, GitHub, Docker, Kubernetes, TensorFlow, PyTorch, scikit-learn, JIRA, Confluence, Crashlytics, New Relic, Azure, GCP, TDES, DUKPT, PAX, AMP, Magtek
1mo
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Quantum Software Engineer II
New Haven, Connecticut, United States
$103k-$154k/yr HybridFull Time
2+ YOEBachelor's in CS/ECE/math/physics/chemistry required; 2+ years Python software development; experience with debugging/profiling, version control, software testing, and quantum APIs (Qiskit, Q#, CUDA-Q, Cirq).
Python, Qiskit, Q#, CUDA-Q, Cirq
5d
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Guidewire Developer, Senior Associate
Chicago or Stamford or Atlanta or Charlotte or Austin or Washington or Columbus or Dallas or Los Angeles or Milwaukee or Denver or Boston or New York or Florham Park or San Francisco or Silicon Valley or Philadelphia or Phoenix or Pittsburgh or Hartford
$77k-$202k/yr OnsiteFull Time
2+ YOEBachelor's degree, minimum 2 years experience, Guidewire platform knowledge, Object Oriented Programming, API integration experience, certifications (Guidewire,Scrum Master) preferred, up to 60% travel.
Guidewire PolicyCenter, Guidewire BillingCenter, Guidewire ClaimCenter, GOSU, PCF, Guidewire Integration Framework, Spring Boot, Rest Client API, SOAP APIs
2mo
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Software Engineer
New York City or Old Greenwich
OnsiteFull Time
0+ YOEStrong programming skills, SQL, and knowledge of one or more of C#, JavaScript, or TypeScript; Python helpful; experience with APIs, CI/CD, and AI tooling; strong problem-solving and ownership.
SQL, C#, JavaScript, TypeScript, Python, React, Angular, CI/CD
3d
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Application Developer – Internal Platform
Glen Cove, New York, United States
$125k-$150k/yr HybridFull Time
4+ YOERequires 4+ years building production web applications, strong C#/.NET and SQL Server experience, MVC knowledge, JavaScript framework familiarity, API design, and third-party platform integration experience.
C#, .NET, SQL Server, MVC, React, Vue, Alpine, Angular, Shopify, Galley, ShipStation, ASP.NET Web Forms, ASP.NET MVC, Razor, Microsoft Entra ID, ERP
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