Available for 1:1 mentorship & mock interviews

Backend engineer who
scales systems to millions.

Vishvajeet Singh · Senior Software Engineer @ Kutumb/Crafto

4.5+ years building high-scale distributed systems and payment platforms — recurring billing for 5M+ subscribers, backends serving 10M+ DAU at sub-50ms p95, and event-driven infra pushing 40M+ notifications/hour.

📅 Book a slot with me ✉️ Email me
📞 +91 93709 94429 ✉️ vishvajeetsingh0605@gmail.com in · LinkedIn gh · GitHub
10M+
Daily active users served
3M+
Concurrent users at peak
5M+
Paying subscribers billed
<50ms
p95 latency under load
Work with me

Book a 1:1 slot

Mentorship, system-design deep-dives, mock interviews, or a career chat — straight from someone who's built and scaled it in production.

System design Mock interviews Backend at scale Career guidance
Single session · ₹499
Toolbox

Technical skills

The stack I use to design, build, and run high-throughput systems.

Languages

TypeScriptJavaScriptC++ GolangPythonC

Backend

Node.jsFastifyReact.js FlaskRedisElasticSearch

Databases

RedshiftPostgreSQLMySQL VectorDB

Cloud & DevOps

AWSDockerKubernetes ArgoCDLambdaGitHub Actions

Monitoring & Analytics

GrafanaKibanaSumoLogic
Track record

Experience

Kutumb / Crafto
Senior Software Development Engineer
Aug 2024 – Present · Bengaluru
  • Owned and scaled a subscription payments platform for 5M+ active subscribers — reliable recurring billing and high availability.
  • Architected backends for 10M+ DAU and 3M+ concurrent users, holding sub-50ms p95 under peak load.
  • Built a subscription recovery engine (paused → retry) with idempotent processing and failure handling — ₹1M+ ARR uplift.
  • Designed recommendation and personalization systems for the consumer app.
  • Built a custom rate limiter for open APIs with load-shedding — live across services, preventing spam and DDoS.
  • Built a custom push-notification system delivering 40M+ notifications/hour via fan-out, batching, and load-spreading.
Apty
Software Development Engineer
Jun 2022 – Mar 2024 · Bengaluru
  • Built a SCIM-based auto user provisioning/de-provisioning system in Golang — ~95% more efficient enterprise user management.
  • Engineered an org-wide Audit Trail Service (Node.js) with fast logging/export — improved audit compliance for 65+ clients.
  • Shipped an in-house feature-flagging tool, cutting operational cost by removing third-party software.
  • Led a content import/export feature (~40% efficiency gain) and multi-GB export analytics on ElasticSearch/Kibana.
  • Automated release-cut-branch blocking via a custom GitHub Action; built an S3 ingestor for the analytics pipeline.
Tata 1mg
Software Engineer Intern
Dec 2021 – Mar 2022 · Remote
  • Optimized the expected-time-of-delivery computation.
  • Improved the Cart/SKO notification system for medicines without substitutes.
Foundation

Education

Army Institute of Technology

B.E., Information Technology · CGPA 9.20/10

2022 · Pune
St. Thomas School

Sr. Secondary 94.6% · Secondary 9.40/10

Mandsaur, MP