Full stack Developer

Kolkata, West Bengal, India

Contract to hire, 3 months

Software Engineering & Technology

5 - 7 years

Job Description:

• 5+ years of experience in full-stack development with a strong command of both front-

end and back-end technologies.
- Proficiency in React, , , JavaScript and related frameworks.
- Experience with backend technologies such as Python or GO and relational/non-

relational databases (MongoDB, MySQL).
- Solid understanding of RESTful API design and WebSocket communication.
- Strong problem-solving skills, system design experience and performance optimization

techniques.
- Familiarity with Docker, Kubernetes, CI/CD tools and cloud platforms (AWS, Azure, or

GCP).
- Knowledge of version control (Git) and agile development workflows.
- Ability to debug complex issues across the stack and deliver high-quality production-

ready code.
- Design, build and maintain scalable web applications across the full technology stack
- Develop RESTful APIs with FastAPI services and middleware using or Python
- Implement responsive front-end components using React, Angular, Typescript, ,

seamless API integration.
- Integrate UI with APIs and back-end services, ensuring optimized performance and

responsiveness.
- Architect, optimize and maintain backend infrastructure including databases
- (SQL/NoSQL), caching layers and cloud-based services.
- Collaborate with UX designers and product managers to deliver high-quality .
- Apply best practices in code quality, security, testing, CI/CD pipelines and DevOps

processes.
- Support legacy systems while gradually modernizing platforms and refactoring for

maintainability and performance.

Experience Range:

5 - 7 years

Educational Qualifications:

B.Tech/B.E

Job Responsibilities:

• Develop, test and maintain end-to-end features across front-end, back-end and

database layers.
- Translate UX design into high-quality code using modern front-end technologies
- Write clean, scalable and maintainable code that adheres to established coding

standards.
- Design and manage APIs that are reliable, secure and scalable to support complex

data flows and integrations.
- Implement data models and database schemas optimized for performance and

scalability.
- Monitor and troubleshoot application performance, identify bottlenecks and

recommend improvements.
- Collaborate with cross-functional teams for seamless deployment, integration and

release of features.
- Maintain version control and participate in code reviews, automated testing and

continuous integration workflows.
- Troubleshoot, debug and upgrade existing UI applications and workflows.
- Stay current with emerging technologies and suggest improvements to existing

architecture and tooling.

Skills Required:

Reactjs , , , JavaScript , Python or GO , MongoDB, MySQL , RESTful API , Docker, Kubernetes, CI/CD tools , AWS, Azure, or GCP) , Git , Angular , SQL/NoSQL , TypeScript

Job Code: KL-PHKYFNG4

About Us

Mantra Labs is a global technology leader specializing in Digital, Data, AI, and Engineering, empowering fast-evolving enterprises to achieve transformational growth.

With best-in-class digital product engineering, technology transformation, and AI-driven solutions, we help Fortune 500 clients in BFSI, healthcare, and consumer internet sectors optimize digital infrastructure, enhance decision-making, and maximize operational efficiency. Our track record spans 200+ successful projects, consistently simplifying customer journeys and scaling businesses for unprecedented growth.

As a CMMI Level 3 and ISO 27001:2013 certified company, we are committed to innovation excellence. Partnered with AWS, Microsoft Azure, Google Cloud, Nvidia, IBM Watson, MongoDB, Rakuten, and Katalon, we deliver tailored, future-ready solutions for our clients to tackle the complex business challenges of tomorrow head-on.

Key Clients: AbbVie Pharmaceuticals, SAAB, PACE Industries, American Auto Club, Change Healthcare, Green Brilliance, ICICI Lombard General Insurance, SBI General Insurance, Care Health Insurance, Pramerica, Aditya Birla Health, AIA Hong Kong, and more.

Why Us?

We are Technology Tinkerers and Experimenters. Building intuitive solutions for our Clients has led to significant milestones over the last 14 years.

The driving force behind Mantra is its team of change agents who focus on practical applications of the latest technologies.

You will find us often having animated debates over Node vs Java or RDBMS vs NoSQL Dbs. Geekiness is our thing and we absolutely love it Freedom at work is at the core of what we aspire to do.

Be it project parties, team outings, or free Coffee We like to celebrate our life in the office. Our cricket team trains regularly while TT acts as a quick stress-buster on a hectic day.

Our internal library has books from multiple genres to help Mantriks declutter their minds.

We have a certification policy to help our employees learn while they earn.

Our Knowledge sharing sessions include hackathons, training, trivia, quizzes, and presentations to help our employees upgrade their skills.

We have a trust-based leave policy where all the leaves are allotted in one go. No accrual business.

We take our Annual Trip very seriously - be it a weekend in Sakleshpur or Gokarna - the whole company goes as one.