Senior Full Stack Engineer

Location: Bangalore

Experience: 5 to 10 years

Joiners: Immediate / Notice Period < 30 days

Company: Wissen Technology

🔍 Job Overview:

We are looking for a passionate and skilled Fullstack Developer with strong backend expertise in Java and advanced frontend proficiency in React, JavaScript, and TypeScript. The ideal candidate will have a deep understanding of core computer science concepts like Multithreading, Collections, and Immutability, and should be highly proficient in building scalable, maintainable systems.

🛠️ Key Responsibilities:

• Design and develop robust, scalable backend systems using Java (preferably Java 8 or higher).
• Build interactive, high-performance UIs using React.js, JavaScript, and TypeScript.
• Implement complex business logic with clean and maintainable code.
• Write efficient, thread-safe code utilizing Multithreading, HashMaps, HashSets, and Collections.
• Work with iterators and immutability principles to build reliable data flows.
• Collaborate with product managers, designers, and QA teams in an Agile environment.
• Troubleshoot and debug production issues as needed.

✅ Must-Have Skills:

• Strong programming experience in Core Java, Multithreading, and Java Collections Framework.
• Solid knowledge of React.js, JavaScript (ES6+), and TypeScript.
• Hands-on with HashMap, HashSet, Iterators, and Immutable Data Structures.
• Experience working with REST APIs, Spring Boot, and microservice architectures.
• Familiarity with version control systems like Git and CI/CD pipelines.
• Strong problem-solving and analytical skills.

💼 Good to Have:

• Exposure to cloud platforms (AWS, GCP, Azure).
• Experience with state management tools like Redux or Context API.
• Knowledge of performance optimization and memory management in JavaScript.

Title

Full Stack MERN/ MEAN Tech Lead

Location

Bangalore

About the company

With over a decade of experience, we specialize in crafting bespoke integration solutions and empowering businesses across the globe with a combined approach to emerging technology. We use cutting edge enterprise platforms - Microsoft, Salesforce, SAP and more Since our establishment in 2004, with our headquarters located in Tampa, USA, eCosmos has been extending global reach and domestic support to a diverse range of organizations, from start-ups to Fortune 500 companies

. Job Summary:

The Lead Developer provides technical expertise which requires a working knowledge of the technical infrastructure underpinning the applications. Plans, consults, and coordinates complex project assignments in the design, development and implementation of applications software. Works as part of a service or project team to implement complex technical solutions that meet business requirements. Responsible for contributing to the planning of the work programs and the review, development, and modification of best practices and technical solutions. Provides supervision to a team of Developers

. What success looks like in this role:

• You will lead a team of 5-10 developers building web apps with React, Node.js, Express and MongoDB, and mobile apps with React Native.

• Architect scalable and high-performance web and mobile apps using proven JavaScript stacks like MERN and MEAN

• Establish best practices for web and mobile development, code quality, testing, and CI/CD

• Proficiency in TypeScript is required to develop and maintain the front-end and back-end of our web applications.

• Plan sprints, assign tasks, and oversee code reviews, testing, and releases

• Troubleshoot and debug applications across the stack

• Manage technical debt and spearhead migrations to new libraries/frameworks when needed

• Hire and mentor developers and promote an engineering culture of learning and excellence.

Skills Required:

• Excellent communication skills, both written and oral.

• Quick problem-solving skills with exceptional aptitude and reasoning. • Good orator, presenter with influencing skills to manage and negotiate complex conflicting resolutions.

• Ability to frame ideas in words to provide a perspective and outcome from analyzing them.

• Experience in leading, managing, mentoring a team of junior developers.

You will be successful in this role if you have:

: • Bachelor's in engineering (B.E or BTech.), MCA.

• 5+ years' experience leading web and/or mobile engineering teams

• Deep expertise with JavaScript, Node.js, React, React Native, and MongoDB • Experience building web apps with MERN or similar stacks • Experience building mobile apps with React Native or similar frameworks

• Excellent verbal and written communication skills

• Comfortable with Agile methodologies like Scrum and Kanban

• Strong leadership skills and commitment to building a world-class engineering team

Compensation & Benefits:

For the right candidate, e-Cosmos is ready to provide an extremely competitive salary and added incentive bonus potential

. e-Cosmos provides an attractive and complete benefits package:

✓ Accidental Death & Dismemberment Insurance

✓ Training and certification assistance

✓ Employee referral bonus program

✓ Vertical and Lateral increments

ETHICS COMPLIANCE:

: e-Cosmos is firmly committed to conducting business in compliance with the letter and spirit of the law and other accepted standards of business conduct as reflected in the company's policies.

Skills: React JS/Next JS, NodeJs, ExpressJs,JavaScript, Typescript, Restful/SOAP web servicesMongo DB(NoSQL/SQL)database technologies.

Experience preferred:

● You have a strong passion for start-ups and the proactiveness to deliver
● You have hands-on experience building services using NodeJs, ExpressJs technologies
● You have hands-on experience of MongoDB (NoSQL/SQL) database technologies.
● You are good at web technologies like React JS/Next JS, JavaScript, Typescript
● You are good at web technologies like Restful/SOAP web services
● You are good at caching and third-party integration
● You are strong on debugging and troubleshooting skills
● If you have Knowledge of Python, Chrome extension & DevOps development is a plus.
● You must be proficient in building scalable backend infrastructure software or distributed systems with exposure to Front-end and backend libraries/frameworks.
● Experience with Databases and micro services architecture is an advantage
● You should be able to push your limits and go beyond your role to scale the product
● Go-getter attitude

We are looking for a passionate hands-on technologist who has experience developing Python web applications with Django as a framework and has the expertise to integrate the same with a UI built using Angular JS. Basically someone, who has worked as a Full Stack Python Developer delivering web applications from end-to-end.

You will be working on our revolutionary and niche products developed for the Fintech domain. You will develop new software for web applications, perform research & development of new technologies, integrate with other systems, and maintain and support proposed web applications. All we are looking for is a person who must be a core developer at heart and able to write, review and fix source code and database issues as they arise. You must be : able to accept change in a dynamic environment and be able to adjust priorities, able to think outside the box, pragmatic, able to voice and effectively communicate opinions, great listeners and detail oriented.

Here’s an opportunity for you to be a part of a Fintech venture with completely disruptive visions like robo advisory and more.. Lets go one step further to see if you can fit in!

Responsibilities

• Write effective, scalable code
• Develop back-end components using REST API to improve responsiveness and overall performance
• Integrate user-facing elements into applications
• Test and debug programs
• Improve functionality of existing systems
• Implement security and data protection solution
• Assess and prioritized feature requests
• Coordinate with internal teams to understand user requirements and provide technical solutions

Requirements

• 2-3 years Work experience as a Full Stack Python Developer
• Expertise in Django and Angularjs
• Knowledge of object-relational mapping (ORM)
• Familiarity with front-end technologies (like JavaScript and HTML5)
• Team spirit
• Good problem-solving skills
• BSc in Computer Science, Engineering or relevant field

Bluecore is a marketing technology company that’s reimagining how the world’s fastest-growing retail brands transform casual shoppers into lifetime customers. Through our patented retail data model and the recent release of Bluecore Communicate™ and Bluecore Site™, we replace manual processes with an intelligent, AI-driven workflow. We are credited with doubling email revenue and increasing customer retention for more than 400 brands, including Express, Tommy Hilfiger, The North Face, Teleflora, and Bass Pro Shops. We have been recognized as one of the Best Places to Work by Glassdoor and ranked No. 241 on the Inc. 500 List, the most prestigious ranking of the nation’s fastest-growing private companies.

Bluecore’s Integrations Engineering (IE) unit is a software engineering team dedicated to helping Bluecore customers extract maximum value from the Bluecore Retail Data Platform.  As an IE, you will bring your technical know-how to the main connections of the Bluecore engine to our clients - drawing meaningful intelligence from their websites and implementing marketing solutions that map to the customer’s vertical, audience behavior, and product mix.

As an Integrations Engineer, your principal responsibilities will lie in (1) maintaining and writing JavaScript-based integrations that live on client websites, (2) configuring, monitoring, and maintaining the intake and manipulation of client data, and (3) utilizing internal infrastructure, tooling and documentation to solve complex, often-unique, client-specific problems. It is important to be detail-oriented in your work, as we work closely with a multitude of the industry’s top online retailers, all of which have very stringent requirements around the look and feel of their strategic communications.

You Are A Perfect Fit If You Love:

-Solving unique, complex problems: You are someone who can think critically, often on the fly, about nuanced technical problems to devise a scalable, maintainable solution. You enjoy the puzzle and the process of iterating and ideating before implementing a solution, and you are able to break complex problems into simple components for better analysis and digestion.

-Metrics and Data: You are someone who finds yourself consumed by daily, weekly and monthly metrics and loves turning those into best practices. Seriously, your work will be driving executive-level decision-makers at industry-leading brands on best business practices.

-Curiosity and Growth: You are someone who actually believes that diversity in thought and skills makes for a better workplace and a better you.

Responsibilities

Write client-side JavaScript to be run on clients' websites and configure custom recommendation logic using domain-specific tooling.

Develop the best technical solution possible for the toughest challenges that our customers will throw at you.

Ideate, develop, and improve upon internal tooling, procedures, and processes that facilitate the work of the Technical Services team.

Monitor the overall health and uptime of our most critical connections to clients

Requirements

Successful completion of reputable schooling in Computer Science or Coding Bootcamp.

Fluent in JavaScript and familiar with various other web development technologies. 

Ability to take ambiguous workflows and turn them into structured processes.

Nice to have

Exposure to (or interest in learning!) SQL, Python, or Google Cloud Functions.

Familiarity with Marketing, Advertising, eCommerce, or other Emerging Technology (Artificial Intelligence, etc.) platforms.

Ability to grow into a client-facing technical resource as a career progresses in Bluecore