Senior Developer (Fullstack)

Job Title : Full Stack Developer (React.js / Next.js)

Experience : 3+ Years

Location : Gurugram Sector 43

Working Days : 5 Days WFO

Employment Type : Full-Time

Job Summary :

We are looking for a passionate Full Stack Developer with strong expertise in React.js and Next.js to build modern, high-performance web applications. This is a frontend-focused role that also requires experience with backend development, APIs, and databases.

Mandatory Skills :

React.js, Next.js (App Router & Server Components), JavaScript (ES6+), TypeScript, REST APIs, SSR/SSG/ISR, PostgreSQL/MySQL, Git, State Management (Redux/Zustand/Context API), HTML5, CSS3/Tailwind CSS

Key Responsibilities :

• Develop and maintain web applications using React.js and Next.js.
• Implement SSR, SSG, and ISR for performance and SEO optimization.
• Build reusable and responsive UI components using Tailwind CSS or similar frameworks.
• Integrate frontend applications with backend APIs.
• Work with PostgreSQL or MySQL databases.
• Manage application state using Redux, Zustand, or Context API.
• Write clean, scalable, and well-documented code.
• Participate in code reviews and testing activities.

Required Skills :

• 3+ years of experience in web development.
• Strong knowledge of JavaScript (ES6+), TypeScript, React.js, and Next.js.
• Experience with Next.js App Router and Server Components.
• Good understanding of REST APIs.
• Experience with PostgreSQL or MySQL.
• Proficiency in Git and modern package managers (npm/yarn/pnpm).

Good to Have :

• Experience with PHP/Laravel (preferred) or Node.js.
• Knowledge of JWT, OAuth, or Laravel Sanctum.
• Experience with Tailwind CSS.
• Familiarity with Docker, Vercel, and CI/CD pipelines.

Job Summary

We are seeking a skilled Full Stack Developer with 3.5+ years of experience in designing and building scalable web applications using Microsoft .NET technologies on the backend and React.js on the frontend. The ideal candidate will be responsible for developing, integrating, and maintaining enterprise-grade applications in a fast-paced Agile environment.

Key Responsibilities

• Design, develop, and maintain robust, scalable, and high-performance web applications using ASP.NET Core and React.js
• Build RESTful APIs and integrate with third-party services
• Implement UI components with reusable and responsive React components
• Optimize application performance and ensure cross-browser compatibility
• Work with relational databases like SQL Server to develop complex queries and stored procedures
• Collaborate with cross-functional teams to understand requirements and deliver high-quality software
• Participate in code reviews, unit testing, and bug fixing
• Follow Agile/Scrum methodologies for software development

Required Skills & Qualifications

• Experience: 3.5+ years of professional experience as a Full Stack Developer
• Frontend: React.js (with Redux or Context API), JavaScript, HTML5, CSS3
• Backend: C#, ASP.NET Core (3.1 or later), Web API, MVC, Entity Framework Core
• Database: SQL Server or other RDBMS, strong knowledge of stored procedures and joins
• Version Control: Git, GitHub/GitLab/Bitbucket
• Cloud & DevOps: Basic understanding of Azure or AWS, CI/CD pipelines (preferred)
• Testing: Unit Testing (NUnit, xUnit, Jest or equivalent)
• Solid understanding of OOP principles, design patterns, and RESTful service integration

Good to Have

• Experience with Docker, Kubernetes, or container-based deployment
• Knowledge of Agile development methodologies
• Exposure to microservices architecture
• Experience in performance optimization and debugging tools

Educational Qualifications

• Bachelor's degree in Computer Science, Information Technology, or related field

Why Join Us?

• Work on modern tech stacks and enterprise-grade solutions
• Collaborative and inclusive work environment
• Flexible work arrangements and growth opportunities
• Competitive salary and performance-based rewards

Lead Java Platform Engineer

Build the high-performance platform services behind our core financial applications.

EXPERIENCE

5+ years (core Java)

CORE TECH

Java · REST APIs ·

SQL/NoSQL

DOMAIN

Financial Services

About the role

We’re seeking a highly experienced and passionate Senior Java Platform Engineer to join our

team. You’ll play a crucial role in designing, developing, and maintaining the robust, scalable

platform services that underpin our core financial applications.

This role demands a deep understanding of core Java principles, a proven track record of

building high-performance APIs, and extensive experience in the financial services industry.

What you’ll do

Design & development

– Design, develop, and maintain high-performance, scalable, and reliable platform services in

Java.

– Build and consume RESTful APIs and other web services.

– Write clean, well-documented, testable code, and contribute to code reviews and quality.

Platform engineering

– Contribute to the architecture and design of our platform services.

– Optimize platform performance and scalability and troubleshoot complex technical issues.

– Ensure the security and reliability of the platform.

Data management

– Work across SQL and NoSQL databases.

– Design efficient data access patterns and apply sound data modelling principles.

Financial services expertise

– Apply deep knowledge of financial industry practices, regulations, data, and systems.

– Work with sensitive financial data structures, with the care that requires.

Automation & workflow– Use Python for scripting and automation tasks.

– Apply (or build) exposure to Apache Airflow or similar tools for data pipelines and

scheduling.

Collaboration & communication

– Collaborate with cross-functional teams — product managers, QA engineers, and

developers.

– Communicate clearly with both technical and non-technical stakeholders.

– Mentor junior engineers.

What you’ll bring

– Bachelor’s or Master’s in Computer Science or a related field.

– 8+ years of experience in core Java development.

– Extensive experience building and maintaining platform services.

– Strong grasp of object-oriented programming principles and design patterns.

– Proven experience designing and developing RESTful APIs.

– Deep knowledge of concurrency, multithreading, and performance optimization.

– Hands-on experience with SQL and NoSQL databases.

– Significant experience within the financial services industry.

– Exposure to Python for scripting and automation.

– Exposure to Apache Airflow or similar workflow management tools.

– Excellent problem-solving, analytical, communication, and collaboration skills.

– Experience with Agile development methodologies.

Nice to have

– Cloud platforms (AWS, Azure, or GCP).

– Containerization and orchestration (Docker, Kubernetes).

– Message queues (Kafka, RabbitMQ).

– Knowledge of financial regulations and compliance requirements.

About Wissen Technology

Wissen Technology is a specialized consulting firm that helps organizations in Banking &

Finance, Telecom, and Healthcare build world-class products. Since 2015, we’ve grown to

1,000+ engineers across the US, UK, India, Australia, Mexico, and Canada and we are a

certified Great Place to Work ®.

Job Requirements

•   3+ years of experience with custom application development.
•   Must be dedicated, passionate, and hard-working. Attitude is everything.
•   Must be able to work with a team and collaborate. Hard workers and self-starters please apply.
•   We are looking for a creative and efficient problem solver.

Technical Requirements

•   Experience working within Agile development environments.
•   Experience with Node.js, PHP, Laravel, React.js, JavaScript, HTML5, CSS3.
•   Experience with Redux, Redux Saga
•   OAuth and JWT Tokens experience is a plus.
•   Experience with the Next.js and Nest.js framework is a plus.
• Advanced Laravel Experience (Middleware, Collections, Policies, and Service Containers).
•   Experience with unit testing (PHP Unit).
•   Experience with MySQL profiling and query optimization.
•   Solid working experience building RESTful APIs.
•   Active experience integrating custom code with 3rd party web services.
•   Hands-on experience with tools such as Git and Jira.
•   Experience working in the AWS (Amazon Web Services) ecosystem.

 Job Duties

•   Work with a team of developers, BA, PM, QA, etc. to execute strategies and implement solutions to build quality business software applications.

•   Develop front-end and back-end components for large data-driven applications.
•   Review features requests, provide feedback, and develop/maintain features for web applications. 
•   Document your development process and development components. 
•   Work with other developers to complete tasks and share ideas.

Your Day-to-Day Tasks Include: 

Ship product, independently and/or as part of a small team 

Collaborate with other engineers to build new features 

Debugging using dev consoles, firebug, firecookie, or any of your favorite tools. 

Help troubleshoot production issues and resolve critical customer facing issues Provide top-notch support to our customers 

You Should Have: 

A strong body of prior front end work, including significant projects written in JavaScript. Mastery of JavaScript; expertise in most of the following technologies, and proficiency in all of them: jQuery, CSS, HTML5, AJAX. 

Deep understanding of closures, prototypal inheritance, DOM manipulation, HTTP, web security, cross browser compatibility challenges. 

Strong Experience with NodeJS and Express JS. 

Hands-on with a code management system like GIT, SVN. 

Experience with NoSQL databases, preferably CouchDB or CouchBase. 

Good to have: Experience with ReactJS and Typescript. 

FULL STACK DEVELOPER

Skills Required:

• The ideal candidate should be hands-on, creative and passionate for new technology in Angular, NodeJS, AWS, MVC and enjoys collaboration, love software programming/coding and carries appetite for learning and sharing knowledge to make an impact on project delivery.
• Experts in multiple technologies such as Modern Java Script framework (preferably Angular 2 and above), Plain old Vanilla Java Script, MVC, jQuery, Web API, Node.JS, AWS, HTML, CSS etc. across software engineering, security, data interchange, data management (No Sql and Relational Database) etc.
• Must have good understanding of TypeScript, Materialized CSS, Sass, Less etc.
• Good to have Task Runners (Grant, Gulp, Webpack), Transpilers like Babel.
• Guide and mentor reporting team and create high performing technology teams.
• Monitor module progress and ensure regular publishing of status report and quality matrices to track the risks work to actively to resolve/mitigate the same.
• Solid understanding of the practical application of agile development methods and leading software development teams in an Agile/Lean/Continuous Delivery environment.
• Solid understanding and experienced of verson control systems like Git, GitHub, BitBucket, SVN etc.
• Should be passionate, voracious continuous learner who keeps up with the latest trends, tools, and technologies in the industry.
• Understands all times, technical depth and client expectation to maintain check on project health, monitors critical path items, risks and impact to timelines.
• Proficient communication/interactive skills

Key Skills:

Angular, MongoDB, Node.JS, MVC Architecture, HTML5, CSS, jQuery.

• Java / Java Script code development using frameworks like Spring, Hibernate , Rest web services,  AWS services.
• · Dev-Ops activities using Maven, Eclipse and other tools
• · Contribute to providing estimates for implementation of new requirements and work diligently towards delivering within the estimates
• · Ensure Quality of the releases by adhering to SDLC best-practices such as, unit tests,continuous integration, system testing
• · Re-use code. Ensure delivered code is modular and extensible
• · Ensure adequate coverage of functional and non-functional requirements in test plans Position Requirements
• · 3-5+ years of hands on experience in Java/J2EE development. Experience with the implementation of a distributed, enterprise JAVA/J2EE solution is strongly preferred
• · Experience in JAVA/J2EE Frameworks such as Spring, hibernate is strongly preferred
• · Experience in SOA and SOA related technologies, solutions and products as well as experience with implementation of REST full web services is preferred
• · Experience with data modelling and experience with relational databases like MySQL, SQL Server or Oracle is desirable
• · Mobile application development experience on Android or iOS is desirable