Tech I work with · full list in Resume

• ~0 yrin production backend
• 0+REST APIs shipped
• 0production bugs found & fixed
• 0+LeetCode problems solved

• Backend APIs & microservices

  NestJS / Express services with clean boundaries, gateway routing, JWT auth and Swagger docs.

• Database design & performance

  MySQL, PostgreSQL, MongoDB, Redis. Indexing, pagination, parallel aggregation, ORMs.

• Reliability & debugging

  Webhook races, reconciliation crons, verification pipelines. I read real data before I fix.

• AI & LLM integration

  RAG with pgvector, Gemini transcription, provider-agnostic model layers with streaming and rate limits.

• Integrations & DevOps

  Exotel telephony, Slack API, S3, Docker, Kubernetes, GitHub Actions CI/CD.

• Full-stack delivery

  Next.js and React front ends on top of the backend, shipped on Vercel with SEO and analytics.

Whether you are hiring for a team or need a freelancer for a scoped project, this is the work I do best.

• Backend & API development

  companies & clients

  REST APIs, microservices, auth, background jobs and integrations in Node.js, NestJS, Express, Fastify or FastAPI.

• AI features for your product

  startups & freelance

  RAG over your documents, transcription, summarisation and LLM workflows with Gemini, Claude or OpenAI, with cost and rate limits under control.

• Database & performance work

  companies & clients

  Schema design, indexing, query optimisation and caching on MySQL, PostgreSQL, MongoDB and Redis. Slow endpoints made fast.

• Full-stack web apps

  freelance

  Next.js front ends wired to solid backends, deployed on Vercel or AWS with CI/CD from day one.

• −50%

  SearchCalls API latency

  parallelized sequential DB and enrichment calls on the highest-traffic endpoint

• 4×

  faster call-log statistics

  collapsed 15+ dashboard queries to 2 with reusable bucket SQL

• 20+ → 10

  telephony statuses unified

  V1/V2/V3 Exotel webhooks resolved into one internal enum

• 0

  double-assigned calls

  atomic DB claim + Redis SET NX single-flight lock, verified with 10 concurrent claimers

1. 01

   Understand the real data

   logs, call records, traces, not assumptions

2. 02

   Design the flow

   states, failure modes, idempotency

3. 03

   Build with tests

   harnesses against real DBs, not mocks

4. 04

   Ship behind checks

   feature flags, CI, staged rollout

5. 05

   Monitor & reconcile

   alerts, cleanup crons, audit trails

• Currently building

  Call-status reliability at VakeelSaab

  two-stage verification, reconciliation cron, single-flight locks

• Currently learning

  System design & Kubernetes operability

  HLD/LLD practice, service scaling, observability

• Available for

  Full-time roles & freelance projects

  New Delhi · Remote · Hybrid

• LeetCode

  @Parshuram01

  480+ solved · max contest rating 1592

• GeeksforGeeks

  136+ problems solved

• GitHub

  @parshuKumar

  18 public repos · open-source npm package

• Replace this with a real recommendation from your manager or tech lead at VakeelSaab. Two or three lines about ownership, debugging and delivery work best.

  TL

• Replace this with a recommendation from a colleague, client or professor. Ask on LinkedIn and paste the text here with their permission.

  SE