Senior .NET Integration Developer

Senior .NET Integration Developer

Description

We are seeking a Senior .NET Integration Developer to design, develop, maintain, and support integrations between internal applications and external systems. This role requires strong hands-on technical skills, production troubleshooting experience, and the ability to independently deliver reliable integration solutions.

This person will own third-party integrations end to end: building and supporting them, working with clients and partners on setup and issues, and helping migrate existing scheduled integration jobs to a more stable job-processing platform.

The ideal candidate will have strong experience with .NET, C#, REST APIs, SQL, and third-party integrations, along with the ability to work with internal and external teams to troubleshoot and resolve complex integration issues.

Key Responsibilities

Integration Development

• Design, develop, and maintain .NET-based integrations and RESTful APIs.
• Develop and support integrations between internal applications, services, databases, and external systems.
• Work with external APIs, webhooks, SFTP, web services, file-based integrations, and other integration mechanisms.
• Implement data transformation, validation, error handling, retry mechanisms, and logging.
• Configure and maintain firm- or partner-specific mappings, credentials, and integration settings.

Job Platform & Migration

• Support existing scheduled integration jobs currently running across mixed platforms.
• Help migrate those jobs to a more reliable job-processing platform (such as Hangfire), including scheduling, retries, monitoring, and failure alerting.
• Improve reliability by reducing silent failures, duplicate runs, and hard-to-support job wrappers.
• Maintain and improve automated notifications related to job success, failure, and operational status.

Production Support

• Troubleshoot and resolve complex production and integration issues.
• Perform root cause analysis and implement permanent fixes.
• Analyze application logs, API responses, database records, and integration workflows to identify issues.
• Work with infrastructure teams, vendors, and external partners to resolve issues spanning multiple systems.

Client & Partner Communication

• Participate in client meetings to understand integration requirements, troubleshoot issues, and communicate technical solutions.
• Communicate directly with clients and external partners regarding integration setup, API requirements, testing, issues, and deployment activities.
• Lead technical onboarding for new integrations, including gathering requirements, coordinating testing, and supporting go-live.
• Prepare clear and professional email communications for technical and non-technical audiences.
• Coordinate with clients and internal teams to track integration issues, dependencies, and action items.
• Translate technical details into clear business-friendly explanations when working with clients.

Technical Development

• Participate in technical design and architecture discussions.
• Perform code reviews and follow established coding and security standards.
• Contribute to CI/CD pipelines and deployment processes.
• Create and maintain technical and operational documentation.

Core Competencies

• Strong written and verbal communication skills
• Ability to communicate effectively with both technical and non-technical audiences
• Professional and confident communication with clients and external partners
• Strong hands-on development and integration skills
• Advanced troubleshooting and analytical abilities
• Strong understanding of API design and integration patterns
• Ability to independently solve complex technical problems
• Strong focus on code quality, reliability, security, and maintainability

Position Requirements

• 5+ years of professional software development experience, with significant experience developing applications and integrations
• Strong hands-on experience with .NET / .NET Core, C#, and RESTful APIs
• Experience developing and supporting internal and external integrations
• Experience working with third-party/external APIs and authentication mechanisms
• Strong understanding of JSON, XML, and common integration patterns
• Experience with MS SQL Server, MySQL/MariaDB, or equivalent relational databases
• Proficiency with Git and source code repository practices
• Experience with Azure DevOps and CI/CD pipelines
• Experience troubleshooting production applications and performing root cause analysis
• Demonstrated experience working directly with clients, external partners, or business stakeholders on technical projects or integrations
• Strong written communication skills, with the ability to clearly document and communicate technical issues, requirements, solutions, and project status
• Bachelor's degree in Computer Science or related field, or equivalent professional experience

Preferred / Nice-to-Have Skills

• Experience with Hangfire or similar background-job / scheduling platforms
• Experience migrating scheduled jobs, console apps, or legacy batch processes to a modern job platform
• Experience with Salesforce or other enterprise / case-management platforms
• Experience with document management or document-based integrations
• Experience with SFTP and file-based integrations
• Experience with AWS services such as S3, EFS, SES, SNS, Lambda, or EC2
• Experience modernizing or migrating legacy applications to modern .NET
• Experience working with legacy Java applications
• Working knowledge of Linux environments
• Experience with automated testing and application monitoring
• Experience using AI-assisted coding tools such as GitHub Copilot, Cursor, or similar tools.