62 sr api developer jobs at 38 companies in Tonawanda, NY
2w
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Senior Full Stack Java / API Developer (267646)
Toronto, Ontario, Canada
HybridFull Time
Design and develop secure, scalable microservices and APIs using Java, Spring Boot, and cloud platforms; participate in security assessments and collaborate with cross-functional teams.
OpenJDK 24, Spring Boot 3.4.5, APIGEE API Gateway, OAuth2, Confluent Kafka, Azure Key Vault, Cloudbees Jenkins, Azure Cloud, PCF, Microsoft SQL, JPA, Open Api/Swagger, Postman, IntelliJ, Service Now, JIRA, Bitbucket, Confluence, Splunk, Dynatrace
1w
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Senior Java Developer (Kafka/API)
Toronto or Quebec
$90k-$140k/yr HybridFull Time
5+ YOE5+ years Java application development experience with REST APIs, Kafka, DevOps tools; strong problem-solving, experience with Kubernetes/Docker, cloud and databases; Reliability Status Clearance required; bilingual (fr) for Quebec roles.
Java, Docker, Kubernetes, Kafka, Jenkins, Artifactory, BitBucket, Gradle, Continuous Delivery Director, Ansible, WebSphere, DB2, Open API, Swagger, Spring Boot, MongoDB, Postgres, Okta, AWS, Maven, KSQL, SonarQube
2mo
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Sr. Java BE Developer
Toronto or Canada
$90k-$110k/yr RemoteFull Time
8+ YOE8+ years experience; strong backend Java (Java 11) and Spring Boot microservices experience, RESTful API development, SQL, Kafka; Kubernetes and Azure experience a plus.
Java 11, Java, Spring, Spring Boot, RESTful APIs, Apache, Kafka, SQL, Kubernetes (K8s), Azure Cloud services
3w
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Salesforce Developer
Waterloo or Toronto
RemoteFull Time
5+ YOE5+ years Salesforce development experience with Apex, Visualforce, LWC; strong integrations and API experience; familiarity with Git, CI/CD and DevOps; unit testing and code review skills.
Apex, Visualforce, Lightning Web Components, APIs, platform events, middleware, ETL, Git, CI/CD, DevOps, Marketo, Allego
1mo
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Backend Engineer, Developer SDKs (Golang)
Toronto, Ontario, Canada
$135k-$258k/yr OnsiteFull Time
6+ YOE6+ years engineering experience, 3+ years as a Golang engineer, interest in multiple languages, and a passion for API design and developer experience.
Golang, Node.js, PHP, Ruby, Open API spec, protobuf
2mo
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Senior Software Developer
Toronto, Ontario, Canada
$120k-$150k/yr HybridFull Time
5+ YOE5+ years software development experience; strong Java background; RESTful APIs; microservices; relational databases (Oracle/PostgreSQL); Java frameworks; containerization.
Spring Boot, Istio, Envoy, Docker, Kubernetes, Oracle, Maven, Hibernate, Netty, Node.js, Knockout, JQuery, Hazelcast, Memcached
2w
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Engineer II - WIAM
Toronto, Ontario, Canada
$97k-$137k/yr OnsiteFull Time
8+ YOEExpertise in full-stack development with Java, Spring Boot, Oracle/SQL Server, UNIX/Linux, IAM (SailPoint IdentityIQ), CI/CD and automation; strong API, scripting, and DevOps experience.
Java, Spring Boot, Oracle, SQL Server, SQL, PL/SQL, Unix, UNIX, Linux, Windows, AIX, BeanShell, Unix Shell, PowerShell, SailPoint IdentityIQ, Jenkins, GitLab CI, Microsoft Azure DevOps, Graph API, RESTful APIs, Microservices
3w
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Software Engineer II
Buffalo, New York, United States
OnsiteContract
5+ YOE5+ years application development experience with strong Java and Spring Boot skills, Azure development (Functions, Key Vault, Managed Identities), RESTful API design, and mentoring experience; Associate's degree or equivalent.
Java, Spring Boot, Azure Functions, Azure Key Vault, Managed Identities, Azure Monitoring, OAuth 2.0
2w
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Software Developer Intermediate (Remote Canada)
Toronto, Ontario, Canada
$90k-$110k/yr RemoteFull Time
5+ YOE5+ years software development experience, Java and Spring, RESTful APIs, SQL, Git, Docker, healthcare/FHIR/HL7 experience preferred; post-secondary education or equivalent.
Java, Spring, RESTful APIs, SQL, Git, Docker, Angular, JavaScript, Node.js, npm, FHIR, HL7, HTTP
1w
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Tech Lead Veeva Vault Developer
São Paulo or Toronto
HybridFull Time, Contract
Senior-level Veeva Vault configuration and Vault Java SDK development experience; Vault APIs and deployment/migration experience; Agile delivery and stakeholder communication skills.
Veeva Vault, Veeva Vault Java SDK, Vault APIs, PromoMats, MedComms, RIM, QMS
1w
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Applied AI Engineer
Batavia or Buffalo or Wyomissing or Rochester or Ithaca
$105k-$145k/yr HybridFull Time
5+ YOEBachelor's degree and 5+ years in software engineering, data science, or applied AI; proficiency in Python and APIs; experience with LLMs, MLOps, cloud AI services; production deployment and governance knowledge.
Python, APIs, Azure, AWS, Google Cloud Platform, Azure Machine Learning, MLflow, Databricks, SageMaker, Vertex AI, Microsoft Foundry, Azure OpenAI, Copilot Studio
1w
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Intermediate Backend Developer (C# & SQL Server) - Remote
Toronto or Ottawa
$60k-$85k/yr RemoteFull Time
5+ YOE5+ years backend development experience with C# and .NET 4.8, strong T-SQL/SQL Server skills, API and CI/CD experience, agile practices, and strong communication.
C#, .NET 4.8, T-SQL, SQL Server, Oracle, Powerflex, ABL (Area Benefits LifeWorks), CI/CD
2w
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Senior Angular Developer
Toronto, Ontario, Canada
$60k-$95k/yr HybridFull Time
5+ YOE5+ years Angular and TypeScript experience, unit/accessibility testing, cloud/container experience, REST API design, security knowledge, CI/CD and front-end performance optimization.
Angular, TypeScript, HTML, CSS, Jest, Cypress, Protractor, JUnit, Mockito, Pivotal Cloud Foundry, OpenShift, Docker, Swagger, RAML, SOAP, JWT, OAuth 2.0, SSL, CI/CD, Webpack
1mo
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Lead Software Engineer - ServiceNow
Buffalo, New York, United States
$116k-$194k/yr HybridFull Time
5+ YOE5+ years systems analysis/application development experience (or equivalent), expert ServiceNow platform development, workflow and integration design, CI/CD and source-control experience, strong communication and problem-solving skills.
ServiceNow, Flow Designer, Service Catalog, Jira, CI/CD, APIs, SDLC
1mo
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Senior Software Developer
Toronto or St. Catharines
$120k-$130k/yr HybridFull Time
6+ YOE6+ years building and shipping production software; hands-on experience putting LLMs into production (RAG, agents, evals); strong backend and frontend skills; proficiency with Git/GitHub, RESTful APIs, and cloud platforms.
TypeScript, Node, React, VueJS, Vite, Tailwind, PostgreSQL, MySQL, MsSQL, Python, CloudFlare, AWS, Azure, MCP, Git, GitHub, Docker, Jira
2mo
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Sr. Design Engineer (Buffalo, NY, United States, 14043)
Buffalo, New York, United States
$107k-$115k/yr HybridFull Time
5+ YOEBachelor's in Mechanical or Aerospace Engineering; PE license or ability to obtain; 5+ years design experience; FEA experience; knowledge of API, MIL, SAE, ANSI, ASME, ASTM; CAD skilled (Inventor, AutoCAD); fabricating and assembly of heavy industrial products.
Autodesk Inventor, AutoCAD, Microsoft Office, Microsoft Project, FEA software
1mo
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Senior Front End Developer
Toronto, Ontario, Canada
$100k-$142k/yr HybridFull Time
Bachelor's in CS or equivalent; proven experience with React, TypeScript, and React Native; GitHub/GitHub Actions; automated testing (unit/API/UI); designing secure, scalable applications; Agile experience and strong communication.
React, React Native, TypeScript, GitHub, GitHub Actions, Kotlin, Swift, Android
1mo
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Senior Software Engineer
Toronto or Alberta or British Columbia or Manitoba or New Brunswick or Newfoundland and Labrador or Nova Scotia or Ontario or Prince Edward Island or Saskatchewan
$95k-$145k/yr RemoteFull Time
8+ YOE8+ years software engineering experience; expertise in C#, .NET or Golang and React; proficiency with JavaScript/TypeScript, UI/API testing (RestSharp, Cypress), CI/CD, unit and E2E testing; strong communication and mentoring skills.
React, Golang, C#, .NET, JavaScript, TypeScript, RestSharp, Cypress, CI/CD, E2E
2mo
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Sr. Manager, Software Development
Irvine or Toronto or Buffalo
$159k-$270k/yr HybridFull Time
12+ YOE7+ MgmtBS/MS/MBA/PhD in CS or related; 12+ years software engineering experience, 7+ years engineering leadership; enterprise SaaS, cloud (GCP/Azure/AWS), Agile, microservices, APIs, AI/LLM experience (Gemini/Claude/Copilot); strong people and cross-functional skills.
C++, C#, Python, PostgreSQL, SQL, No SQL Databases, Front End Web, Web Services, event-driven microservices, Microfrontends, SPAs, Mulesoft, Tibco, Workato, Gemini (Google), Claude (Anthropic), Microsoft Copilot, APIs, SAP, GCP, Azure, AWS, CI/CD pipelines, infrastructure as code
1mo
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Lead Software Engineer AI (Staff Engineer)
Eagan or Frisco or Toronto or Ann Arbor
$127k-$237k/yr HybridFull Time
5+ YOEBachelor's degree or equivalent, 5+ years full-stack experience building scalable cloud applications; expertise in C#/.NET, backend architecture, APIs, distributed systems, and AI integration (LLMs, OpenAI/Anthropic); front-end skills (JavaScript/Typescript, Angular/React); AWS, PostgreSQL/SQLServer, CI/CD.
C#, .NET, ASP.NET Core, FastAPI, SQLServer, PostgreSQL, AWS, Vercel, JavaScript, Typescript, HTML, CSS, Angular, React, GitHub Actions, OpenAI, Anthropic, LLMs