Available for opportunities

India · Remote-friendlyFintech · SaaS · Enterprise

Kunal Khairnar

Building scalable, secure, and high-performance web applications across fintech, SaaS, and enterprise ecosystems.

Download Resume GitHub LinkedIn Get in Touch

7.6 years

Years Experience

20M+

Records Processed

100K+

Users Optimized

40%

Perf. Improved

Kunal Khairnar

Senior Full Stack Engineer

Open

ReactNext.jsNode.jsTypeScriptKubernetesAWSPostgreSQLMicroservicesDockerGraphQLReactNext.jsNode.jsTypeScriptKubernetesAWSPostgreSQLMicroservicesDockerGraphQL

Explore

About Me

Engineering robust solutions across the stack.

I am a Senior Full Stack Engineer with over 7.6 years of experience building scalable, highly available systems. My expertise spans the entire development lifecycle, from architecting cloud-native microservices to crafting responsive, high-performance user interfaces.

My core expertise includes Node.js, React, TypeScript, microservices, MongoDB, and cloud-native infrastructure. Over the years, I've worked extensively on performance optimization, API design, observability, authentication systems, and scalable data processing workflows.

I care deeply about writing maintainable code, designing extensible systems, and solving real-world engineering problems with pragmatic trade-offs. Beyond development, I enjoy mentoring engineers, leading technical discussions, and sharing knowledge through workshops and collaborative learning. Outside of tech, I enjoy exploring system design concepts, learning about distributed systems, and occasionally hiking to disconnect from screens.

0M+

Records Processed

0K+

Users Optimized

Automation Achieved

Performance Improved

Technical Arsenal

Tools and technologies I use to build scalable systems.

Frontend

ReactNext.jsTypeScriptJavaScriptReduxTailwind CSS

Backend

Node.jsNestJSExpress.jsGraphQL

Databases

PostgreSQLMongoDBRedisSQLElasticsearch

Cloud & DevOps

DockerKubernetesAWS

Architecture

MicroservicesNATSRabbitMQDistributed SystemsKafka

Testing

JestTesting StrategiesReact Testing Library

Experience

My professional journey building software at scale.

Nexus Cognitive

Senior Full Stack Engineer

2023 - Present

Lead the web application team for an enterprise fintech platform used by banks to validate small-business loan eligibility and payment history through centralized reporting systems.
Collaborated closely with the data warehouse team to support ingestion workflows for PGP-encrypted banking files, contributing to discussions around data modeling, storage strategies, and reporting architecture using MySQL and Trino.
Built and maintained Node.js and React-based reporting applications that enabled banks to analyze account histories, payment trends, and member submission reports through secure role-based access systems.
Developed scalable REST APIs and interactive React dashboards with advanced filtering, drill-down views, and real-time data consistency using Redux and custom hooks.
Implemented enterprise-grade RBAC, validation, and secure access controls for multi-tenant user management and protected financial data access.
Participated in sprint planning, requirement refinement, stakeholder demos, and phased production deployments across staging, UAT, and production environments.
Coordinated development activities across a team of developers, QA engineers, and data warehouse stakeholders while facilitating Scrum ceremonies and technical discussions.

ReactNode.jsExpress.jsReduxPostgreSQLMongoDBETLRBAC

Sleek

Full Stack Engineer

2022 - 2023

Developed and deployed an automated corporate income tax platform using React and Node.js, reducing manual processing effort for accountants by approximately 95%.
Designed and maintained large-scale data migration scripts to extract, transform, and synchronize financial data from XERO into ERPNext for over 13,000 client companies with high data accuracy and validation controls.
Built scalable React-based applications for company incorporation, corporate management, accounting workflows, and tax compliance operations.
Developed secure REST APIs and backend services to support complex financial workflows, client onboarding, and compliance-driven business processes.
Managed containerized application deployments using Kubernetes, including deployment configurations, service management, and secure secret handling.
Collaborated with product, operations, and engineering teams to streamline digital corporate service workflows and improve platform reliability and operational efficiency.

ReactNode.jsMicroservicesFintechAPIs

Value Add Soft Tech & Systems

Senior Full Stack Engineer

2020 - 2022

Developed a Playbook Management Platform that enabled professionals and organizations to standardize workflows, collaborate efficiently, and manage task-driven documentation with file attachments.
Improved operational productivity by approximately 50% by designing reusable workflow management features and streamlining task execution processes.
Built and optimized Microsoft Graph API integrations to query and manage Azure Active Directory data for over 100K users, improving search performance and scalability.
Developed secure backend services using Node.js, MongoDB, and JWT-based authentication while implementing Redis caching to enhance application responsiveness.
Built responsive React-based user interfaces and collaborated with cross-functional teams to deliver scalable enterprise workflow solutions.

ReactNode.jsMongoDBPostgreSQL

Atos Syntel, India

Software Engineer

2018 – 2020

Developed a courier management application to support user onboarding, shipment tracking, and consignment management workflows.
Built RESTful APIs using Node.js and Express.js to handle shipment operations, user management, and backend business logic with improved response performance.
Developed responsive React-based user interfaces with reusable components, improving application usability and page rendering performance.
Collaborated with team members across development and testing phases while contributing to feature implementation, bug fixes, and release activities.

ReactNode.jsExpress.jsMongoDB

Featured Projects

Architectural highlights and system designs.

Concert Ticket Booking Platform

Scalable ticket booking platform handling high-concurrency event sales with NATS messaging and microservices.

Architecture Highlights

Event-driven microservices architecture
High-concurrency traffic management
Kubernetes orchestration

ReactNode.jsMicroservicesNATSDockerKubernetes

Absolute Gym

Full-featured gym management platform with payment integration, admin dashboards, and membership management.

Architecture Highlights

Secure payment processing
Role-based admin dashboards
Real-time membership tracking

Next.jsReactNode.jsMongoDB

E-Commerce Platform

Secure checkout with JWT auth, product filtering, Stripe payments.

ReactNode.jsMongoDBStripe

Portfolio Website

This portfolio — SSR optimization, smooth animations, and a responsive, accessible design.

Next.jsTypeScriptTailwind CSSFramer Motion

Open Source & Activity

A glimpse into my engineering consistency.

Contributions

Repositories

Stars

Forks

JavaScript
38%
TypeScript
30%
Python
16%
CSS
11%
Other
5%

⌁ Contribution Activity

LessMore

How I Build Systems

Core principles that guide my engineering decisions.

Scalability First

Systems must be designed for 10x growth from day one. I prioritize horizontal scaling, stateless microservices, and efficient data partitioning.

Performance Obsessed

Every millisecond matters. From optimizing database indexes to reducing frontend bundle sizes, performance is a core feature.

Clean Architecture

Strict separation of concerns. I build testable, modular systems that are easy to maintain, refactor, and extend over time.

Security Minded

Zero-trust environments by default. I implement RBAC, encrypt data at rest and in transit, and strictly sanitize all inputs.

Observability Built-In

You can't fix what you can't see. Structured logging, metrics, and distributed tracing are implemented from the start, not as an afterthought.

Developer Experience

Great DX leads to great UX. Fast CI/CD pipelines, clear documentation, and robust local development environments are essential.

Key Achievements

Milestones and impact delivered.

Employee of the Quarter

Recognition for exceptional system architecture contribution, successfully migrating legacy monolithic services to a modern Kubernetes-based microservices architecture.

Microservices Workshop Lead

Led an extensive internal workshop for 100+ engineers, standardizing distributed systems patterns and establishing best practices across the engineering organization.

40% Latency Reduction

Engineered critical database optimizations and caching strategies that cut query latency by 40% for a high-traffic fintech system during peak transaction hours.

Get in Touch

Let's build something extraordinary together.

Open to senior engineering opportunities, platform engineering roles, and scalable system challenges. If you're building high-performance systems and need someone to architect, execute, and scale, let's talk.

~ contact_info.sh

$ cat contact.json

{
  "name": "Kunal Khairnar",
  "role": "Senior Full Stack Engineer",
  "contact": {
    "email": "kunal.khairnar96@gmail.com",
    "github": "github.com/kunal8411",
    "linkedin": "www.linkedin.com/in/ikunal/"
  },
  "status": "Available"
}

$ ▋

Email Me LinkedIn GitHub