Nayan is available for hire

Nayan Pattanayak

Verified Expert in Engineering

Software Engineer and Developer

Hyderabad, India

Toptal member since July 8, 2026

Expertise

Back-end Developers Algorithms Web Development API Full-stack Front End Integration Code Review System Security SaaS OutSystems Git

Bio

Nayan is a senior full-stack engineer with 11+ years of experience designing and delivering enterprise-scale applications using Java, Spring Boot, React, Angular, Node.js, Microservices, cloud platforms such as AWS and Azure, and event-driven architectures. He's led distributed teams, modernized legacy systems, handled cloud migrations and scalable platform engineering. Nayan has worked with Oracle, GAP, ADP, and TCS with expertise in React, REST APIs, Kafka, PostgreSQL, OAuth, and Kubernetes.

Portfolio

Oracle

React, Tailwind CSS, Node.js, Spring Boot...

Gap

Java 17, Spring Boot, React, JavaScript, Terraform, Kubernetes, Spring Data JPA...

ADP

Java 8, Jakarta EE (Java EE or J2EE), React, Spring Batch, Spring Boot, AWS IoT...

Experience

Java 17 - 10 years
Spring Boot - 8 years
Microservices - 8 years
AWS IoT - 5 years
React - 5 years
Azure Integration Services - 5 years
Apache Kafka - 5 years
Terraform - 3 years

Preferred Environment

Azure, GitHub Actions, React, Java 17, Spring Boot, Apache Kafka, Docker, React Redux, Amazon Web Services (AWS), Full-stack Development

The most amazing...

...thing I built is a scalable payment platform, improving reliability and supporting millions of transactions.

Work Experience

Lead Software Engineer

2022 - PRESENT

Oracle

Led a team of 8 engineers for the development of 15+ customer-facing enhancements on the Oracle EPM Cloud platform, supporting thousands of enterprise users globally.
Implemented responsive and interactive user interfaces using React.js and Redux, delivering an enriched user experience through reusable components, efficient state management, and optimized application performance.
Co-ordinated with different teams for gathering customer feedback and implemented it to reach good customer satisfaction.
Improved user experience through Oracle Visual Builder and Oracle JET-based UI modernization initiatives.

Technologies: React, Tailwind CSS, Node.js, Spring Boot, Oracle JavaScript Extension Toolkit (JET), VBCS, Agile, REST APIs, Oracle Cloud, SQL, JPA, HTML5, CSS3, Docker, Full-stack, JUnit 5, Web Services, Back-end Development, Bug Fixes, Algorithms, Full-stack Development, Back-end, PostgreSQL, Software Architecture, Web Development, TypeScript, Event-driven Architecture, Front-end, API Integration, Databases, Amazon Web Services (AWS), Code Auditing, GitHub, Microservices, RESTFul APIs, DevOps, Redis, APIs, Integration, Architecture, User Experience (UX), Large Language Models (LLMs), ABAC, Authorization, Role-based Access Control (RBAC), Single Sign-on (SSO), Spring, Apache Tomcat, JasperReports, Oracle 12c, Spring Security, SaaS, Spring Microservice, Springbot, Orchestration, User Management, Authentication, Database Management, Cloud Infrastructure, Code Review, Database Optimization, OutSystems, Performance Optimization, Technical Architecture, Technical Leadership, Troubleshooting, Next.js, Supabase, AI Agent Orchestration, Infrastructure, Front-end Development, User Interface (UI), AI Agents, NPM, Server-side Rendering (SSR), OAuth, OpenID Connect (OIDC), Claude Code, Git, Distributed Systems, OpenAI, Agentic Coding, Amazon Elastic Container Service (ECS), Leadership, Scalable Architecture, AI-assisted Development, Agentic AI, Cross-functional Communication, Microservices Architecture, API Architecture, API Gateways, Apigee, Apigee Hybrid, Data, ChatGPT, Product Management, Problem Solving, Project Management, Claude, Lovable, API Design, Front-end Architecture, Software Design, RESTful Web Services

Senior Software Engineer

2021 - 2022

Gap

Developed a comprehensive Settlement Dashboard using a modern technology stack including React.js, Redux, TypeScript, Node.js, JavaScript, HTML5, CSS3, REST APIs, and Material UI, delivering a responsive, scalable, and intuitive user experience.
Improved payment settlement reliability by implementing robust retry mechanisms, exception handling, and reconciliation processes, achieving 99.9% successful transaction processing.
Delivered enhancements for the retail payment settlement platform supporting millions of online transactions for one of the world's largest retail brands.
Led the design and implementation of critical payment settlement modules while collaborating with cross-functional teams, including product owners, QA, DevOps, and external payment vendors.
Played a key role in migrating payment settlement services from a monolithic architecture to Azure-based microservices, enabling independent deployments and improved operational resilience.

Technologies: Java 17, Spring Boot, React, JavaScript, Terraform, Kubernetes, Spring Data JPA, Azure Integration Services, JUnit, Apache Kafka, React Redux, JUnit 5, Cloudsmith, Agile, REST APIs, Kafka, SQL, JPA, HTML5, CSS3, Tailwind CSS, Java Message Service (JMS), SonarQube, Docker, Full-stack, Node.js, Web Services, Back-end Development, Bug Fixes, Algorithms, Full-stack Development, Back-end, PostgreSQL, Software Architecture, Web Development, TypeScript, Keycloak, Event-driven Architecture, WebSockets, Front-end, Angular, API Integration, CRM, eCommerce, Databases, Inventory Management, Amazon DynamoDB, Amazon Web Services (AWS), Code Auditing, GitHub, Web Push Notifications, Payment Gateways, Microservices, RESTFul APIs, NestJS, DevOps, Redis, Azure Cosmos DB, Azure Kubernetes Service (AKS), Vite, Azure Event Hubs, Flyway, APIs, Integration, HubSpot, HubSpot API, SimplyBook.me, Architecture, User Experience (UX), Google Cloud Platform (GCP), Authorization, Reactive Programming, Role-based Access Control (RBAC), Multitenancy, gRPC, Spring, SpiceDB, Apache Tomcat, Oracle 12c, Spring MVC, Spring Security, SaaS, Spring Microservice, Springbot, Orchestration, Authentication, Database Management, Cloud Storage, Cloud Infrastructure, Code Review, Database Optimization, Microsoft SQL Server, Multi-tenant Architecture, Performance Optimization, Technical Architecture, Technical Leadership, Troubleshooting, Bun, Infrastructure, Front-end Development, User Interface (UI), Event-driven Systems, NPM, OAuth, OpenID Connect (OIDC), Git, Distributed Systems, Databricks, Minimum Viable Product (MVP), Email, Payment APIs, Payments, Leadership, Scalable Architecture, AI-assisted Development, Cross-functional Communication, Microservices Architecture, API Architecture, API Gateways, Apigee, Apigee Hybrid, Data, Cron, DNS, SMTP, Problem Solving, API Design, Front-end Architecture, Software Design, Next.js, RESTful Web Services, CI/CD Pipelines, Automated Testing

Senior Software Engineer

2018 - 2021

ADP

Developed and delivered 8 Spring Boot microservices and Apache Kafka event consumers processing 500,000+ tax notice events annually, enabling highly scalable and event-driven processing.
Developed a comprehensive Notices Dashboard using React.js, Redux, JavaScript, HTML5, and CSS3, leveraging reusable components and efficient state management to deliver a responsive, intuitive, and seamless user experience.
Collaborated with product, data science, QA, and DevOps teams to successfully deliver enterprise-grade tax automation solutions.
Participated in architectural discussions, code reviews, and technical design sessions to promote best practices across the engineering team.
Improved application scalability and resilience by adopting an event-driven microservices architecture using Apache Kafka and asynchronous processing.

Technologies: Java 8, Jakarta EE (Java EE or J2EE), React, Spring Batch, Spring Boot, AWS IoT, Apache Kafka, JUnit, Azure, Jenkins, Agile, Kanban, REST APIs, Kafka, SQL, JPA, HTML5, CSS3, Java Message Service (JMS), Apache Camel, SonarQube, SoapUI, Full-stack, JUnit 5, Web Services, Back-end Development, Bug Fixes, Algorithms, Full-stack Development, Back-end, PostgreSQL, Software Architecture, Web Development, Python, Keycloak, Event-driven Architecture, WebSockets, Front-end, Angular, API Integration, CRM, eCommerce, Databases, Inventory Management, Amazon DynamoDB, Amazon Web Services (AWS), Code Auditing, GitHub, Web Push Notifications, JavaScript, Payment Gateways, Camel, Microservices, RESTFul APIs, NestJS, MongoDB, Redis, Azure Cosmos DB, Azure Kubernetes Service (AKS), Flyway, APIs, Integration, Amazon MSK, Architecture, Artificial Intelligence (AI), Authorization, Reactive Programming, Multitenancy, Spring, SCIM, Apache Tomcat, MySQL, Spring MVC, Spring Microservice, Springbot, Database Management, Cloud Storage, Cloud Infrastructure, Code Review, Microsoft SQL Server, Multi-tenant Architecture, Performance Optimization, Technical Architecture, Troubleshooting, Bun, Front-end Development, User Interface (UI), Event-driven Systems, Server-side Rendering (SSR), Monorepos, Turborepo, OAuth, GraphQL, Express.js, Git, Distributed Systems, Databricks, Go, Minimum Viable Product (MVP), Email, Payment APIs, Payments, Leadership, Scalable Architecture, Cross-functional Communication, Microservices Architecture, API Architecture, API Gateways, Apigee, Apigee Hybrid, Data, Cron, DNS, SMTP, Bitbucket, Problem Solving, API Design, Front-end Architecture, Software Design, Jest, RESTful Web Services, CI/CD Pipelines, Automated Testing

Systems Engineer

2015 - 2017

Tata Consultancy Services

Designed and developed a cloud-native digital payments platform enabling secure cardless P2P transactions using facial recognition technology.
Designed and implemented JSR 352 batch processing solutions for high-volume data loading, improving operational efficiency and processing reliability.
Collaborated with cross-functional teams to deliver a proof-of-concept digital payment solution showcasing cloud-native architecture and AI-powered authentication.
Built RESTful services using JAX-RS and Hibernate, ensuring secure and efficient integration with downstream banking systems.

Technologies: Java, Hibernate, JAX-RS, HTML, CSS, Control-M, AWS IoT, Spring Boot, Spring Batch, JSR Batch, JavaScript, Agile, REST APIs, SQL, JPA, HTML5, CSS3, SonarQube, SoapUI, JUnit 5, Web Services, Back-end Development, Bug Fixes, Algorithms, Full-stack Development, Back-end, Web Development, API Integration, Databases, GitHub, RESTFul APIs, APIs, Integration, Technical Architecture, Troubleshooting, Git, API Architecture, API Gateways, Cron, DNS, SMTP, Bitbucket, Problem Solving, API Design, Front-end Architecture, Software Design, RESTful Web Services, CI/CD Pipelines, Automated Testing

Experience

Oracle EPM Cloud Enhancements

This enterprise product is used worldwide to budget, finance, and manage company resources and includes modules such as planning, budgeting, and cost management. I led the development of customer-facing enhancements to Oracle's Enterprise Performance Management Cloud, which is used globally for planning, budgeting, forecasting, and financial management.

Enterprise Payment Settlement Platform | Gap

Designed and developed a cloud-native payment settlement platform that processes online retail payment settlements for one of the world's largest fashion retailers. The platform handles settlement requests received from batch processing systems and securely integrates with external payment gateways to complete financial settlements.

AI-powered Tax Notice Automation (ADP)

Built an event-driven platform that automated tax notice extraction using machine learning, OCR, Kafka, and Spring Boot microservices. The solution significantly reduced manual processing while improving turnaround time. I developed Spring Batch feedback mechanisms for machine learning.

Snap2Pay | AI Facial Recognition Payment Platform

Developed an AI-powered cloud-native payment platform that enabled secure cardless P2P transactions using facial recognition. The platform leveraged AWS Rekognition to authenticate users and complete transactions within seconds.

Education

2011 - 2015

Bachelor's Degree in Computer Science

Biju Patnaik University of Technology - Rourkela, Odisha, India

Certifications

JULY 2018 - PRESENT

Oracle Certified Java EE 6 Web Service Developer

Oracle

AUGUST 2016 - PRESENT

Oracle Certified Professional, Java SE 6 Programmer

Oracle

Skills

Libraries/APIs

React, JAX-RS, REST APIs, Node.js, JasperReports, Apigee, Java Message Service (JMS), React Redux, HubSpot API

Tools

SoapUI, Keycloak, GitHub, Apache Tomcat, NPM, Git, Cron, Bitbucket, ChatGPT, Terraform, Control-M, Jenkins, SonarQube, Azure Kubernetes Service (AKS), Flyway, Claude Code, Amazon Elastic Container Service (ECS), Claude

Languages

JavaScript, Java 8, Java, SQL, HTML5, CSS3, TypeScript, Python, Go, HTML, CSS, GraphQL

Frameworks

JUnit, Spring Boot, Spring Batch, Hibernate, JPA, Apache Camel, JUnit 5, Spring, Spring MVC, Spring Security, Spring Microservice, Next.js, Camel, Angular, Tailwind CSS, Oracle JavaScript Extension Toolkit (JET), NestJS, Express.js, Jest, gRPC

Paradigms

Microservices, Agile, Event-driven Architecture, Microservices Architecture, API Architecture, Automated Testing, Kanban, DevOps, ABAC, Reactive Programming, Role-based Access Control (RBAC)

Platforms

Jakarta EE (Java EE or J2EE), Apache Kafka, Azure, Amazon Web Services (AWS), Kubernetes, AWS IoT, Docker, Google Cloud Platform (GCP), Databricks, Azure Event Hubs, HubSpot, SimplyBook.me

Storage

Spring Data JPA, PostgreSQL, Databases, Amazon DynamoDB, MySQL, Oracle 12c, Database Management, Microsoft SQL Server, Oracle Cloud, MongoDB, Redis, Azure Cosmos DB

Industry Expertise

Project Management

Other

Java 17, RESTFul APIs, Kafka, Full-stack, Web Services, Back-end Development, Bug Fixes, Algorithms, Full-stack Development, Back-end, Software Architecture, Web Development, WebSockets, Front-end, API Integration, eCommerce, Code Auditing, APIs, Integration, Architecture, User Experience (UX), SaaS, Springbot, Authentication, Cloud Storage, Cloud Infrastructure, Code Review, Database Optimization, Multi-tenant Architecture, OutSystems, Performance Optimization, Technical Architecture, Technical Leadership, Troubleshooting, Infrastructure, Front-end Development, User Interface (UI), Event-driven Systems, Server-side Rendering (SSR), OAuth, OpenID Connect (OIDC), Distributed Systems, Email, Payment APIs, Payments, Scalable Architecture, AI-assisted Development, Cross-functional Communication, API Gateways, Apigee Hybrid, Data, SMTP, Problem Solving, API Design, Front-end Architecture, Software Design, RESTful Web Services, CI/CD Pipelines, Azure Integration Services, Payment Gateways, GitHub Actions, Cloudsmith, SOAP, VBCS, JSR Batch, CRM, Inventory Management, Web Push Notifications, Amazon MSK, Artificial Intelligence (AI), Authorization, Multitenancy, Single Sign-on (SSO), Orchestration, User Management, Bun, Supabase, AI Agents, OpenAI, Minimum Viable Product (MVP), Agentic Coding, Leadership, Agentic AI, DNS, Product Management, Integration Testing, Machine Learning, Facial Recognition, Vite, Large Language Models (LLMs), SCIM, SpiceDB, AI Agent Orchestration, Monorepos, Turborepo, Lovable

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