Senior Software Engineer (.NET / React)

We are an IT services company based out of San Francisco, USA. ​​We build and acquire expert engineering teams to help our clients meet their business needs and solve their operational challenges.

We are looking for a Senior Software Engineer for long-term contract work to join one of our client’s Development Product Teams. You will join a Web Development and API Team responsible for integrations with company internal systems like Sharepoint, Salesforce, Zendesk, and others.

This position may require working between the hours 12:00 PM to 8:00 PM Kyiv time. 

Responsibilities:

• Design, implement and maintain backend services and APIs using .NET (C#) and microservices patterns.
• Develop responsive frontend applications using React; maintain component library with Storybook and integrate with CMS.
• Design and optimize relational database schemas and queries (e.g., SQL Server, PostgreSQL).
• Build, maintain and improve CI/CD pipelines and infrastructure in Azure (Azure DevOps / GitHub Actions, Terraform, etc.).
• Manage environments (stage/prod), release processes, runtime support, monitoring, logging, security and incident response.
• Design and implement API integrations with third-party services (REST, SOAP, GraphQL), ensuring security, reliability and versioning.
• Use AI-assisted coding tools (required — experience with Claude Code or another code-generation AI) to accelerate development, refactoring and reviews.
• Perform code reviews, and contribute to architectural decisions.

Requirements:

• 8+ years of professional experience in web application development; proven senior-level capability.
• Strong proficiency in .NET (C#) for building APIs and services.
• Solid experience in React, including hooks and modern state management patterns.
• Practical experience with Azure services (App Services, AKS, Functions, Storage, Key Vault, etc.) and CI/CD.
• Hands-on DevOps experience: automation, containerization (Docker), orchestration.
• Experience managing runtime environments and ensuring availability, scalability, observability, alerting, and recovery.
• Strong knowledge of relational databases and query/schema optimization.
• Experience with Storybook and CMS-driven component/content workflows.
• Demonstrated experience designing and implementing robust API integrations (REST, SOAP, GraphQL).
• Using AI coding tools (Claude Code or similar) as part of the workflow
• English proficiency required for clear and quality written and verbal communication

Would be a plus:

• Node.js development experience.
• Salesforce integration experience.