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# Senior Software Developer, Partner API (.NET)

- **Company:** Swyfft, Limited Liability Company
- **Location:** Miami, FL, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, Application Programming Interfaces (APIs), Microsoft Azure, C Sharp (Programming Language), Computer Engineering, Internetworking, Microsoft Office, Microsoft Software, Microsoft SQL Server, OAuth, Software Engineering, Management of Software Versions, Openapi, Software Security, AI Coding Agents, Backend, Rate Limiting, Information Technology, Api Gateway, Restful APIs, Webhooks, Api Management
- **Published:** November 8, 2026
- **Apply:** https://www.careerbuilder.com/job-details/senior-software-developer-partner-api-net-miami-fl--06099f4f-c011-42aa-bde7-a18e5444ba0a

## About the Role

Software Development, Application Programming Interface (API), Microsoft .NET, Property Insurance, Insurance Sales, Microsoft SQL Server, Production Systems, Microsoft C# (C Sharp), Microsoft Windows Azure, Microsoft .NET, 7+ years of experience as a backend developer, including 3+ years building or maintaining a partner-facing or public API.

Education:

A Bachelor's degree in Computer Science, Computer Engineering, or equivalent work experience is required.

Computer Skills:

Fluent in C#, ASP.NET Core, and SQL Server (MSSQL); experience with Azure. We're a MS Office environment. Experience using video and chat technology (MSTeams & Slack).

Nice to Have:

Insurance or fintech industry experience, including ACORD standards. API gateway experience (Azure API Management or similar), SDK generation, and webhooks.

Other:

Reliable high-speed internet connectivity required. Designated quiet work from home space.

## Description

Own the Partner API contract end to end: resource design, versioning, deprecation, and backward compatibility across releases. Design clear, consistent API resources, and build the translation layer that keeps the public contract stable as our internal systems evolve. Work directly with our partners' engineering teams to support their integrations, including partner-specific work on our side when an integration calls for it. Design consistent error responses, idempotency, authentication, and rate limiting, along with the usage metrics that show how partners use the API. Keep the OpenAPI spec and developer documentation accurate and current, with contract tests that catch breaking changes before partners do. Write and review production C# code, partner with QA and product, and ship through our release process.

The Successful Candidate: (what were looking for)

You've designed, shipped, and run a REST API used by external developers in production, and kept it backward compatible through versions. A few years on a well-known public API (payments, e-signature, communications) is exactly the kind of background we mean. You think contract-first: OpenAPI, schema evolution, deprecation policies, and changelogs. You know API security and multi-tenancy: API keys or OAuth 2.0 client credentials, scopes, tenant isolation, and quotas. You've put a clean public contract in front of a complex internal domain and can explain the tradeoffs. You like working with other companies' developers, and you write clearly for them in docs and email. You know how to get the most out of AI coding agents; our team uses them every day.