487 sr api developer jobs at 209 companies in Washington
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Senior API Developer
Tacoma, Washington, United States
$100k-$160k/yr OnsiteFull Time
7+ YOE7+ years API development experience, strong API design and security knowledge, proficiency with Java/Python/JavaScript and frameworks, CI/CD and testing experience, DoD clearance preferred.
Java, Python, JavaScript, Spring, Flask, Node.js, OAuth 2.0, JWT
1w
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Sr Software Engineer - Backend API Platform
Seattle, Washington, United States
$125k-$229k/yr OnsiteFull Time
6+ YOE6+ years backend/platform engineering experience building scalable user-facing APIs; expertise in identity and access models, API design, operational excellence, and mentoring engineers.
Node.js, TypeScript, Kubernetes, AWS, OIDC, Keycloak, SPIFFE, mTLS
4w
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Staff Software Engineer, API Platform
San Francisco or Seattle
OnsiteFull Time
12+ YOE5+ Mgmt12+ years technical experience,5+ years strategic technical leadership,experience with API design and infrastructure,proficient in Java/Ruby/Python/Go,strong communication and problem-solving skills.
Java, Ruby, Python, Go, Kafka, Kubernetes
1w
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Staff Software Engineer, API Platform
Seattle or South San Francisco
$224k-$336k/yr OnsiteFull Time
12+ YOE5+ Mgmt12+ years technical experience,5+ years technical leadership,experience with API design and infrastructure,proficiency in at least one of Java,Ruby,Python,Go,strong communication and problem-solving skills.
Java, Ruby, Python, Go, Kafka, Kubernetes
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Senior Software Engineer, API/SDK
Seattle, Washington, United States
$191k-$253k/yr OnsiteFull Time
8+ YOE8+ years software engineering with customer-facing responsibilities; strong in API design, distributed systems, cloud and container platforms, CI/CD, multiple languages (Python, Java, Go, C++); must be a U.S. Person.
Python, Java, Go, C++, CI/CD, Docker, Kubernetes, AWS, Azure, GCP, REST, gRPC, GraphQL, WebSockets, message queues
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Sr. Software Engineer
Gurugram or United States or California or Colorado or Connecticut or Maryland or Nevada or New Jersey or New York or Ohio or Rhode Island or Washington
RemoteFull Time
5+ YOE5+ years software development experience (or 3+ with advanced degree); strong Java or C# skills; full-stack experience with React/Angular, HTML/CSS, cloud-native architectures, AWS/Kubernetes, SQL/NoSQL, REST APIs, monitoring/OpenTelemetry; on-call and mentoring experience.
Java, C#, JavaScript, React, Angular, HTML, CSS, SQL, NoSQL, Amazon Web Services (AWS), Kubernetes, OpenTelemetry, Flutter, REST API
2mo
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Sr. Software Dev Engineer, Antenna System Validation, Amazon Leo
Redmond, Washington, United States
$168k-$227k/yr OnsiteFull Time
5+ YOE5+ years software development, leadership experience, mentorship; strong backend language proficiency and system design.
Python, Rust, C++, Java, Go, Cloud (AWS), CI/CD, Data processing, API design, DevOps
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Sr. Software Developer
Orange or Arizona or California or Florida or Maryland or Maine or Michigan or Missouri or North Carolina or Nevada or New York or Ohio or Oklahoma or Oregon or South Carolina or Texas or Utah or Washington or Wyoming
$120k-$145k/yr RemoteFull Time
7+ YOE7+ years professional software development with Microsoft .NET stack, experience with React/TypeScript, RESTful API design, Playwright, cloud deployments (AWS preferred), practical use of Claude or similar LLM agent tools, and demonstrated technical leadership.
ASP.NET WebForms, React, TypeScript, C#, .NET Web API, RESTful API, Claude, Redux Toolkit, Zustand, Playwright, CI/CD, Azure DevOps, AWS, ECS, Lambda, Step Functions, Bedrock, Azure, GCP
2mo
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Software Engineer, API SDK
San Francisco or Seattle or New York City
$293k-$385k/yr HybridFull Time
7+ YOE7+ years of professional engineering experience; experience building SDKs; design and implement SDKs for multiple languages; collaborate across teams.
Python, Node.js, Golang, Java, Ruby, SDK generation
4w
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Senior Software Engineer - API Platform & Client Tooling
Bellevue or Livingston or New York City or San Francisco or Sunnyvale
$153k-$204k/yr OnsiteFull Time
Production Go experience, API design and versioning, client tooling/SDK/CLI or provider work, code-generation or compiler/tooling experience preferred, cross-team collaboration and mentorship.
Go, gRPC, protocol buffers, Buf, ConnectRPC, Terraform Plugin Framework, Cobra, CWIC
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Sr Software Engineer II
Seattle or New York City
$176k-$196k/yr OnsiteFull Time
5+ YOEBS in CS or equivalent, 5+ years software development, proficiency in Go and Python, experience with telemetry, observability, data pipelines, cloud (AWS/GCP/Azure), and embedding AI/LLM APIs into workflows.
Go, Python, LLM APIs, AWS, GCP, Azure, CI/CD
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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
2d
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Sr Engineer, Software
Overland Park or Bellevue or Atlanta
$114k-$205k/yr OnsiteFull Time
4+ YOEBachelor's degree in computer science or engineering, 4–7 years of technical engineering experience, Java Spring Boot, RESTful APIs, Agile/Scrum, DevOps, CI/CD, and AI/ML experience; U.S. work authorization required.
Java, Spring Boot, RESTful APIs, Agile, Scrum, DevOps, CI/CD, Splunk, AppD, Grafana, RabbitMQ, Kafka, Docker, Kubernetes, AI/ML, machine learning, automation frameworks
3w
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Sr. Software Engineer I, Evaluation Services
Chicago or California or Colorado or Florida or Georgia or Illinois or Indiana or Minnesota or Missouri or Montana or New Jersey or New York or North Carolina or Ohio or Oregon or Pennsylvania or South Carolina or Texas or Utah or Vermont or Virginia or Washington or Wisconsin or District of Columbia
$125k-$175k/yr HybridFull Time
5+ YOE5+ years software engineering with API development and partner integrations; strong REST/WebSocket/JSON/OAuth skills; proficiency in TypeScript/JavaScript or Python; excellent troubleshooting and communication.
REST APIs, WebSockets, JSON, OAuth, Postman, curl, browser developer tools, network analyzers, TypeScript, JavaScript, Python, React, Node.js, Swagger/OpenAPI, ReadMe
4w
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Sr Software Engineer, Platform
Seattle, Washington, United States
OnsiteFull Time
5+ YOE5+ years building and operating production distributed systems; BS in CS preferred; strong Go or Python experience; REST/gRPC APIs; cloud-native tooling and scalability focus.
Go, Python, REST, gRPC, CI/CD, Kafka, MQTT, Kubernetes, Docker, MongoDB, MP4, HLS, ffmpeg
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Sr. Engineer, Software - Archimedes
St. Louis or Brentwood or Alaska or Arizona or Arkansas or California or Connecticut or Delaware or Hawaii or Idaho or Louisiana or Maine or Massachusetts or Michigan or Mississippi or Montana or Nebraska or Nevada or New Mexico or New York or North Carolina or North Dakota or Oregon or Rhode Island or South Carolina or South Dakota or Texas or Utah or Vermont or Washington or West Virginia or Wyoming or United States
HybridFull Time
8+ YOEBachelor's in CS or related; 8+ years software engineering experience (5+ years with C#, .NET, React); experience with cloud-native, APIs, microservices, CI/CD, Git, Azure; technical leadership and mentoring experience.
C#, .NET, ASP.NET Core, React, TypeScript, JavaScript, REST APIs, GraphQL, Webhooks, API Management, Microsoft Azure App Services, Microsoft Azure Functions, Microsoft Azure Container Apps, Microsoft Azure Kubernetes Service (AKS), Microsoft Azure Storage, Microsoft Azure Databricks, Microsoft Azure Data Lake Storage Gen2, Microsoft Azure Synapse Analytics, Microsoft SQL Server, PostgreSQL, Microsoft Azure DevOps, GitHub Actions, CI/CD, Infrastructure as Code, Retrieval-Augmented Generation (RAG), Microsoft Azure OpenAI, Microsoft Azure AI Services, Intelligent Automation, Agent-Based Solutions, OWASP, OAuth2, OpenID Connect, DevSecOps, Git, Azure Repos, GitHub, TFS, Jira, Unix/Linux shell scripting
1mo
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Sr. Backend Engineer - Activations
San Francisco or New York City or Seattle or Little Rock
$130k-$197k/yr HybridFull Time
5+ YOE5+ years writing production code; strong Java/Scala/Golang skills; 3+ years with Big Data ecosystems (Spark, Hadoop/MR, Kafka); distributed systems and RESTful API experience; Spring Boot; cloud experience (GCP/AWS/Azure).
Java, Scala, Golang, Spark, Hadoop/MR, Kafka, RESTful APIs, OAuth, GCP, AWS, Azure, Spring Boot, Singlestore
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Sr. FullStack Software Engineer
Bellevue, Washington, United States
$120-$200/yr HybridFull Time
5+ YOE5+ years full‑stack experience with Python/Django and React; experience building scalable SaaS, comfort with cloud (AWS/GCP/Azure), CI/CD, RESTful APIs, WebSockets, and AI/ML integrations.
Python, Django, React, Cursor, Windsurf, AWS, GCP, Azure, CI/CD, RESTful APIs, WebSockets
2w
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Sr. Software Developer in Test
Kirkland, Washington, United States
$137k-$205k/yr OnsiteFull Time
5+ YOE5+ years in test automation/SDET roles; strong Python, Selenium, API testing (requests, pytest, Postman); Jenkins, Docker, Linux, Git; experience with hardware-software products and CI/CD integration.
Python, Selenium, requests, pytest, Postman, Jenkins, Docker, Linux, Git
5d
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Sr. Application Engineer (DevOps, AI)
Seattle, Washington, United States
$99k-$140k/yr HybridFull Time
5+ YOE5+ years with .NET/C#/SQL and Python, strong DevOps experience with Azure Pipelines or GitHub Actions, API and IAM (MFA/RBAC) skills, experience with Azure AI and intelligent agents, Bachelor's preferred.
.NET, C#, SQL, Python, Azure DevOps, Azure Pipelines, GitHub Actions, Git, Azure AI Services, Microsoft Copilot, ANSI SQL, T-SQL, CLI
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