Senior .NET Engineer

We are looking for a .NET Full-Stack Engineer to join a long-term product focused on Microsoft Teams and voice communication.
The role is backend-heavy, with the main focus on C#/.NET, Microsoft Graph integrations, Teams calls, meetings, recordings, and communication data.

What you'll work with
C# / .NET / ASP.NET Core
Microsoft Teams integrations
Microsoft Graph API
Microsoft Graph Communications / Cloud Communications APIs
Teams calls, meetings, recordings, call records, participants
REST APIs
SQL
Azure
React / Angular / TypeScript
SignalR / WebSockets

Must have
4+ years of commercial C# / .NET experience
Strong ASP.NET Core / backend experience
Commercial Microsoft Graph API experience
Hands-on experience with Microsoft Graph Communications / Cloud Communications APIs
Experience with Teams calls, meetings, recordings, or communication APIs
SQL
English B2+

Will be a plus
VoIP / telephony
WebRTC
SIP / RTP
Contact center / UCaaS / CCaaS
Compliance recording
Real-time audio/media processing
Strong Azure experience

What We Offer
Stable, long-term product project
Direct cooperation with a US-based client
Long-term collaboration and predictable workload
Transparent compensation
Paid vacation and sick leave
Learning and professional development support
High-quality equipment
Paid office lunches
Anniversary gifts and baby bonus