Sajal Jain

Software Engineer

Mumbai, Maharashtra, India5 yrs 7 mos experience

Key Highlights

Designed scalable systems for 20M concurrent users.
Led critical architecture changes during peak traffic.
Mentored junior engineers in system design.

Stackforce AI infers this person is a Backend-focused engineer with expertise in SaaS and high-concurrency systems.

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Skills

Core Skills

Distributed SystemsSystems DesignCloud ServicesMobile Development

Other Skills

JavaAmazon Web Services (AWS)EMQXKotlinC++CPythonMachine LearningDockerAmazon DynamoDBIntegration TestingCode ReviewDesign DocumentsREST APIsContinuous Integration and Continuous Delivery (CI/CD)

About

I am a Software Development Engineer at Dream11, Mumbai, with over 5 years of non-internship professional experience. My work focuses on designing and building large-scale, real-time distributed systems, improving performance, and resolving complex production issues under high traffic conditions. I have led high-impact projects end to end, owning system design, execution, and production readiness while mentoring SDE-1 engineers. I prioritize reliability, deterministic system behavior, and scalability, especially during peak, business-critical events. I take ownership of ambiguous problems, bring structure to unclear requirements, and work closely with stakeholders to deliver robust, scalable backend solutions.

Experience

5 yrs 7 mos

Total Experience

1 yr 11 mos

Average Tenure

1 yr 8 mos

Current Experience

Dream11

SDE-2

Sep 2024 – Present · 1 yr 8 mos · Mumbai, Maharashtra, India · On-site

Designed and scaled a real-time backend → app messaging system serving ~20M concurrent users using MQTT (EMQX).
Led architecture changes during IPL peak traffic, achieving sub-second p95 latency while reducing infrastructure cost.
Built production-grade observability and end-to-end QoS latency tracking by extending an open-source Erlang Datadog client.
Acted as primary on-call during high-traffic events, leading live debugging, mitigation, and post-incident hardening.
Mentored SDE-1 engineers and drove design discussions for reliability and scalability improvements.

JavaAmazon Web Services (AWS)Distributed SystemsSystems Design

Amazon

Software Development Engineer

Aug 2022 – Aug 2024 · 2 yrs · Bengaluru, Karnataka, India · On-site

Worked in Alexa Connectivity Team
Led CloudAuth migration for a stateful direct-to-host service by designing an Nginx + Lua proxy layer to comply with AWS authentication constraints.
Improved latency and fleet efficiency through routing consolidation and JDK17 upgrade, reducing infrastructure footprint.
Owned Alexa Q4 peak readiness planning, scaling strategy, and operational documentation.
Implemented privacy-compliant request masking in user-facing cloud workflows.

JavaAmazon Web Services (AWS)Cloud ServicesSystems Design

Samsung electronics

Software Engineer

Sep 2020 – Aug 2022 · 1 yr 11 mos · Noida, Uttar Pradesh, India · On-site

Owned end-to-end feature development in Samsung Contacts & Phone apps within a large Android codebase.
Improved contact migration performance by 50%+ through critical path optimization and sync refactoring.

JavaKotlinMobile Development