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Biswajit
Swain

Lead Backend Developer  ·  Fullstack Engineer

Building scalable APIs, multi-tenant systems, healthcare workflows, and AI-powered products that handle real load at real scale.

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3+ // years shipped
3 // products owned
1500+ // req/wk handled
∞ // scale mindset
Biswajit Swain
Biswajit Swain Available
01 / About

Who I am

I'm a backend engineer who designs systems that scale — not just code that runs. With hands-on experience across healthcare platforms, KYC infrastructure, and high-concurrency APIs, I focus on building things that are reliable, fast, and maintainable.

My work spans the full backend stack: API design, multi-tenant data architectures, region-aware routing, EHR pipelines, and AI-augmented workflows. I think in systems, not features — every decision traces back to product impact and engineering durability.

When I'm not engineering, I'm reading system design content, contributing to tooling, or exploring how LLMs can power smarter developer workflows.

🏥

Healthcare Engineering

Designed multi-tenant SaaS backends for B2B and B2C clinical workflows — EHR, scheduling, referral management, and compliance-ready infrastructure.

🔐

KYC & Identity Platforms

Built dynamic onboarding workflows and UPI-based eKYC integrations that cut onboarding friction and improved compliance conversion.

⚡

High-Concurrency Systems

Engineered APIs that handle thousands of concurrent requests weekly — with optimized query layers and scalable request handling at the core.

02 / Experience

Where I've worked

Lead Backend Developer
AllesHealth
2022 — Present
  • Architected and owned the multi-tenant backend for a SaaS healthcare platform serving B2B partners, clinicians, patients, and admins across India and global markets.
  • Built region-aware database routing for India and EU deployments — ensuring data residency compliance and sub-region failover reliability.
  • Designed the core appointment scheduling engine — timezone-aware booking, real-time slot availability, conflict resolution, cancellation, and referral workflows.
  • Built EHR capabilities for structured lab reports, prescription management, and longitudinal patient history — accessible to clinician and patient dashboards.
  • Enforced healthcare compliance standards, data isolation, and role-based access control across multi-tenant tenants with zero cross-tenant data leakage.
  • Led backend ownership across partner onboarding, admin portals, and patient-facing product modules — shipping full features with minimal engineering overhead.
Node.js LoopBack MongoDB MySQL AWS Multi-Tenant Healthcare EHR
Fullstack Developer
Signzy
2021 — 2022
  • Built customizable KYC onboarding flows — dynamic form logic, conditional validations, and configurable journey steps for enterprise clients.
  • Integrated UPI-based eKYC workflows with real-time identity verification pipelines, reducing manual intervention in compliance-critical paths.
  • Delivered measurable gains in onboarding efficiency and conversion through workflow optimization and backend validation refactoring.
  • Worked cross-functionally with compliance, product, and QA teams to maintain audit trail integrity and regulatory alignment.
Node.js Hapi.js React KYC eKYC MySQL Sequelize
Fullstack Developer
FunctionUp
2020 — 2021
  • Engineered high-concurrency backend services to support 1500+ project submissions weekly — with optimized queuing and request routing.
  • Reduced API response latency through query optimization, indexing strategies, and selective eager loading across relational data models.
  • Built and maintained fullstack modules for the learner platform — submission management, progress tracking, and grading pipelines.
Node.js Express.js React MongoDB REST APIs
03 / Skills

Technical Stack

Languages
JavaScript Node.js Python
Frameworks
Express.js LoopBack Hapi.js React
Databases & ORM
MongoDB MySQL Sequelize Firebase
Cloud & DevOps
AWS EC2 AWS S3 AWS RDS AWS IAM CloudTrail CI/CD Linux
APIs & Integration
REST APIs Postman LLMs Git
Tools
Notion Jira Slack
04 / Projects

What I've built

// 01

Multi-Tenant EHR &
Scheduling Platform

A production-grade Electronic Health Records backend powering clinician, patient, partner, and admin workflows across India and EU — built for scale, compliance, and real-time performance.

  • Multi-tenant backend with strict data isolation per tenant
  • Region-aware database routing — India & EU data residency
  • Timezone-aware scheduling engine with real-time slot availability
  • Conflict-free appointment booking, rescheduling & referral flows
  • Structured EHR: lab reports, prescriptions, patient history
  • AI-driven health data extraction from unstructured documents
  • Predictive analytics and clinical intelligence layer
  • Healthcare compliance — RBAC, audit trails, data security
Node.js LoopBack MongoDB MySQL AWS LLMs Healthcare
// 02

LLM Document
Intelligence Engine

A modular AI backend that ingests, indexes, and queries documents using retrieval-augmented generation — enabling context-aware answers from structured and unstructured enterprise data at scale.

  • LLM-powered document understanding and extraction
  • Retrieval-Augmented Generation (RAG) pipeline
  • Semantic search across large document corpora
  • Context-aware, grounded answers from private data
  • Scalable ingestion APIs with async processing queues
  • Modular AI backend — swap models, retrievers, or chunkers
  • Query API with streaming response support
Python Node.js LLMs RAG Vector DB REST APIs AWS S3
05 / Education

Academic background

B.Sc — Computer Science & Mathematics
Utkal University
Bhubaneswar, Odisha, India
7.50
// SGPA
06 / Contact

Let's work together

Open to backend, fullstack, and platform engineering opportunities — wherever hard problems need reliable systems.

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