Sanjay Kumar

Backend Engineer

Bengaluru, Karnataka, India12 yrs 6 mos experience

Highly Stable

Key Highlights

Led major engineering efforts at Microsoft.
Reduced infrastructure costs by 10x.
Migrated monolithic apps to microservices.

Stackforce AI infers this person is a Backend Engineer specializing in SaaS and distributed systems.

Contact

kumar.sanjay@microsoft.com LinkedIn

Skills

Core Skills

MicroservicesDistributed SystemsCloud-nativeEvent-driven ArchitectureApi DesignRouting ProtocolsCarrier Ethernet

Other Skills

AzureBack-End Web DevelopmentCC#C++C/C++ STLCloud-Native MicroservicesContinuous Integration and Continuous Delivery (CI/CD)Embedded LinuxEmbedded SoftwareEmbedded SystemsEnglishExpress.jsFront-end DevelopmentFull-Stack Development

About

🚀 Senior Backend Engineer | Distributed Systems | Cloud-Native Microservices | .NET Core | Azure I’m a results-driven backend engineer with 12+ years of experience designing scalable, distributed systems for mission-critical enterprise platforms. At Microsoft, I’ve led major engineering efforts across Outlook and Teams — including unifying calendar APIs and modernizing 60+ legacy .NET APIs. My work has reduced infrastructure costs by 10x, cut onboarding latency by 95%, and boosted platform adoption by 50%. I specialize in .NET Core, microservices architecture, event-driven systems, and secure API design. I’ve successfully migrated monolithic apps to microservices, implemented telemetry pipelines using Kusto and Azure Data Explorer, and driven cross-functional projects with global teams. Beyond code, I’m passionate about technical mentorship, clean architecture, and building systems that last. I believe in shipping reliable software that scales — fast. 💬 Let’s connect if you’re hiring backend leaders or passionate about building resilient distributed platforms.

Experience

Microsoft

Software Engineer II (Senior Backend Engineer – Infrastructure)

Apr 2018 – Apr 2025 · 7 yrs · Bengaluru Area, India

Migrated monolithic booking system to cloud-native microservices on .NET Core and Azure, reducing onboarding latency by 95% and enabling horizontal scalability.
Designed and implemented event-driven onboarding using Substrate Bus, improving new user acquisition by 20% and monthly active usage by 50%.
Refactored the staff availability module into an independent microservice, reducing operational costs by 10x and improving deployment autonomy.
Modernized 60+ legacy APIs by replacing ASPX pages, HTTP Handlers, and tightly coupled endpoints with RESTful, secure .NET Core services.
Secured cross-service communication with OAuth2, PoP-PFT, and cert-based authentication, supporting unification of Outlook and Teams calendar systems.
Led a 5-engineer team to revamp telemetry pipelines using Azure Data Explorer and Kusto, improving event processing performance by 25%.
Contributed to the desktop-to-web integration of Outlook features using OPX, enhancing user experience and feature parity.

REST APIsTelemetryDistributed SystemsC++Continuous Integration and Continuous Delivery (CI/CD)Event-Driven Architecture+2

Synopsys inc

Senior R&D Engineer - I

Nov 2017 – Apr 2018 · 5 mos · Bengaluru Area, India

Built a multi-threaded distributed testing framework to validate chip designs across multiple compute clusters and delivered critical infrastructure used by global teams to simulate and verify large-scale chip datasets.
Automated test orchestration and result aggregation, reducing regression test cycle time and improving analysis accuracy.

TelemetryDistributed SystemsC++Microservices

Infinera

Software Engineer

Nov 2013 – Oct 2017 · 3 yrs 11 mos · Bengaluru Area, India

Developed fault-tolerant routing protocols (GMPLS, RSTP, BOOTP) for OTN/Metro transport systems used by global telecom providers.
Delivered features like Shared Mesh Protection and Instant Bandwidth to support high-availability and dynamic traffic rerouting.
Partnered with hardware, QA, and field engineering teams to deliver production-ready software for XT500 transport switches.

C++Routing Protocols

Tejas networks

R & D Engineer

Aug 2012 – Oct 2013 · 1 yr 2 mos · Bangalore

Delivered enhancements for MPLS OAM, ProxyPhy, IGMP Snooping, and loopback diagnostics on Carrier Ethernet platforms.
Developed and maintained packet IO structures and monitoring tools to improve reliability and traceability in production systems.
Collaborated with cross-functional hardware and systems teams to release stable builds deployed by ISP clients across global.

C++Carrier Ethernet