Arjun S

5+·years of experience·Backend & platform engineer·Document AI & OCR pipelines

Backend and platform engineer focused on OCR, RAG, and document‑AI systems. I design and run high‑throughput APIs, cost‑efficient OCR pipelines, and production‑grade RAG services that stay fast, observable, and cheap to operate. I care about clear architecture, good monitoring, and solving real business problems with reliable systems.

Systems that stay fast, observable, and cheap

Hire Me

"Good backend systems are boring in production."

Skills

Technologies & Expertise

Languages & Backends

5 skills

Python95%

TypeScript92%

Node.js90%

FastAPI92%

Express / NestJS85%

System Design & Infra

4 skills

High-throughput APIs95%

Background workers & queues95%

Event-driven architecture90%

Caching & performance95%

Databases & Storage

4 skills

Postgres95%

MySQL85%

Redis95%

Vector stores (Qdrant)85%

Observability & Tooling

3 skills

Logging & tracing90%

Metrics & dashboards90%

Alerting & SLO thinking85%

Projects

Selected Work & Contributions

2024 · Python

Document AI RAG pipeline

Designed and implemented a production RAG pipeline over 1M+ documents.
Built ingestion, chunking, and hybrid search over a vector store.
Added evaluation harness to track answer quality and regression.
Focused on cost-aware OCR usage and latency budgets for real users.

PythonFastAPIPostgresQdrant

2023 · Node.js

Usage-based billing & metering service

System-design style project for usage-based billing across multiple APIs.
Aggregates events from message queues and writes to Postgres with idempotency.
Exposes read-optimized endpoints for invoices and dashboards.
Handles backfills, partial failures, and reconciliation workflows.

Node.jsTypeScriptPostgresKafka

Education

Formal Training & Degrees

B.E. Computer Science

Example Institute of Technology· Bengaluru, India(2015–2019)

Focused on data structures, algorithms, operating systems, and distributed systems basics.