Sr. React Engineer

Responsibilities:

• Developing and implementing UI components using React.js
• Collaborating with cross-functional teams to design and ship new features
• Building reusable components and front-end libraries for future use
• Translating designs and wireframes into high-quality code
• Optimizing components for maximum performance across various web browsers
• Staying up-to-date with the latest industry trends and technologies
• Troubleshooting and debugging issues to ensure smooth user experiences
• Participating in code reviews to maintain code quality and consistency

Required React developer requirements, qualifications & skills:

• Proficiency in React.js and its core principles
• Strong JavaScript, HTML5, and CSS3 skills
• Experience with popular React.js workflows (such as Redux)
• Familiarity with RESTful APIs and integration
• Knowledge of modern authorization mechanisms, such as JSON Web Tokens
• Understanding of front-end build tools and pipelines
• Excellent problem-solving and communication skills
• A strong attention to detail, and a passion for delivering high-quality code
• Adaptability to changing project requirements and priorities
• Experience with version control systems (e.g., Git)
• A degree in computer science, software engineering, or a related field

About NonStop io Technologies:

NonStop io Technologies is a value-driven company with a strong focus on process-oriented software engineering. We specialize in Product Development and have a decade's worth of experience in building web and mobile applications across various domains. NonStop io Technologies follows core principles that guide its operations and believes in staying invested in a product's vision for the long term. We are a small but proud

group of individuals who believe in the 'givers gain' philosophy and strive to provide value in order to seek value. We are committed to and specialize in building cutting-edge technology products and serving as trusted technology partners for startups and enterprises. We pride ourselves on fostering innovation, learning, and community engagement. Join us to work on impactful projects in a collaborative and vibrant environment

Brief Description:

NonStop io is seeking a proficient React.js developer to join our front-end development team. In this position, you’ll be mainly crafting and integrating UI components through React.js methodologies and workflows like Mobx and Redux.

Responsibilities:

● Developing and implementing UI components using React.js

● Collaborating with cross-functional teams to design and ship new features

● Building reusable components and front-end libraries for future use

● Translating designs and wireframes into high-quality code

● Optimizing components for maximum performance across various web browsers

● Troubleshooting and debugging issues to ensure smooth user experiences

● Participating in code reviews to maintain code quality and consistency

● Improvement and optimization of existing codebase

● Keeping up with industry trends

● Identifying issues with technologies and architecture and then implementing solutions

● Assist with ticket creation, refinement, and estimation

● Participate in sprint planning and ticket distribution for frontend team

Qualifications & Skills:

● Proficiency in React.js and its core principles

● Strong JavaScript, TypeScript, HTML5, and CSS3 skills

● Experience with popular React.js state management libraries and approaches (such as Mobx, Redux, and Context API)

● Familiarity with RESTful APIs and integration

● Knowledge of modern authorization mechanisms, such as JSON Web Tokens

● Understanding of front-end build tools and pipelines

● Familiarity with any one of backend technologies such as Node.js, Java, or Python

● Excellent problem-solving and communication skills

● A strong attention to detail, and a passion for delivering high-quality code

● Expertise in designing scalable and efficient front-end architecture

● Adaptability to changing project requirements and priorities

● Experience with version control systems, particularly Git

● Experience working in Scrum and familiarity with Atlassian (Jira, Confluence, Bitbucket)

● Experience with diverse applications and architectural patterns

● A degree in computer science, software engineering, or a related field

● Strong understanding of object-oriented programming principles and design patterns

● Familiarity with automated testing frameworks and methodologies

● Excellent problem-solving skills and attention to detail

● Strong communication skills and ability to work effectively in a collaborative team environment

● Ready to be a tech-agnostic engineer and comfortable to shift on any tech stack

● Comfortable working with AI (Claude code, Cursor etc)

If you're passionate about technology and want to work on impactful projects, we'd love to hear from you

Technology Stack: Next.js, Express.js, PostgresSQL, GCP

Location: Ahmedabad

About Medflix - empowering healthcare professionals for better care

Medflix (www.medflix.app/app) is a platform where healthcare professionals (doctors, medical students and more) stay updated through live talks, Q&As, support material and more. Through the platform we believe that these professionals can be empowered to deliver better care to patients (like our families) throughout the globe.

In its current (and evolving) form, it is a live learning and engagement platform seeing tremendous week-on-week growth through stellar speakers and a very active early community. The product is in the growth stages and you will be playing a key role in steering the tech to create a scalable and lovable product experience.

We are backed by startup, VC and PE veterans including Kunal Shah (CEO, Cred), Raghunandan G (Zolve, ex-TFS), Avnish Mehra (Everstone) and more.

Medflix is a platform by PlexusMD (www.plexusmd.com/app), a network trusted and loved (4.4 stars on Playstore and 4.4 on Appstore) by more than 3 lakh doctors in India and working closely with leading healthcare providers and companies like AIIMS, Jaslok, Hinduja, Apollo, HCG, Elsevier, Association of Physicians of India, Indian Association of Cardio-thoracic surgeons, Society of Nuclear Medicine, Govt of Gujarat (HFW Dept), Govt of Haryana (SIFHW), McKinsey and company, Takeda, Mankind and others.

About the Role

Tech stack (expertise in all is not required, experience in some will be sufficient):

• React / Next.js (required, at least 1 year of experience)
• Express.js (required, at least 1 year of experience)
• Familiarity with cloud services (gcp / azure / aws)
• PostgreSQL (or expertise in any relational database)
• Redis
• Docker/Kubernetes deployment (good to have)

For this role we are looking for engineers with an entrepreneurial mindset, an understanding of how startups operate and who like to get their hands dirty when unknown things come their way. You will work closely with the product team to prioritise and ship features with a predictable cadence.

As this role is full-stack, you need to have a good understanding of frontend design and be obsessed with responsiveness and pixel-perfect behaviour. On the backend side, an OCD for efficiency and optimisation is a required personality trait.

Demonstrated history of solving hard problems (frontend/backend or both) is a great-to- have.

Benefits and growth

While we ensure competitive compensation (plus ESOP options for deserving candidates), at Medflix, you will also have a strong say in how final solutions look. You will get the opportunity to learn to steer an accelerating rocket ship.

College credentials, background or years of experience are no bar for growth inside the company for enthusiasts who believe in our mission and demonstrate that passion to create a product that healthcare workers love. 

Technical Skills

• 1. 4 years developing Reactive Native Front End App Experiences using React Native and the Expo Framework with core understanding of JavaScript Bridge (JSI) and the rest 4 building Front End App Experience
• Brownfield Experience
• 2. Deep proficiency in JavaScript and TypeScript (highly preferred), including modern ES6+ concepts
• 3. Strong command of React Principles, React Hooks, Context API, and Component lifecycles
• 4. Knowledge of how to use Component Libraries to build applications
• 5. Hands-on experience with the latest Expo SDKs, Expo Router (file-based routing), and EAS workflows
• 6. Should understand concepts around caching and how to achieve the same
• 7. Proven experience with state management libraries such as Zustand, Redux Toolkit, or MobX
• 8. Deep understanding of iOS and Android deployment Lifecycles, application
• signing, and app store guidelines
• 9. Deep skills of Git, GitHub, and continuous integration pipelines
• 10. Proficient in using Agentic AI to leverage spec, skills and agents to do 50% of their
• work across development, documentation and testing

Role Summary

The Senior Front-end Developer builds and maintains client-facing interfaces per UI/UX designs and product requirements, owns front-end architecture and code-review standards, and mentors the Junior Front-end Developer. This is a specialized front-end role, not a full-stack position.

Key Responsibilities

•   Own front-end architecture decisions, including framework, state management, and tooling choices.

•   Set and enforce code-review, testing, and performance/accessibility standards for the pod.

•   Lead implementation of complex, high-visibility features.

•   Troubleshoot and resolve complex front-end performance or technical issues.

•   Mentor the Junior Front-end Developer, including code review and skill development.

•   Partner closely with UI/UX to ensure design fidelity and flag implementation constraints early.

•   Evaluate and recommend front-end tooling or library upgrades.

Required Skills & Technical Competencies

•   Deep expertise in a modern front-end framework (React strongly preferred) and associated ecosystem.

•   Strong understanding of front-end performance optimization and accessibility standards.

•   Experience owning front-end architecture for a production application.

Targeted Qualifications

•   5–8 years of front-end development experience.

•   Deep expertise in a modern framework (React preferred) and front-end architecture patterns.

•   Experience owning performance and accessibility standards.

•   Bachelor's degree in Computer Science or related field.

Preferred / Nice-to-Have

•   Experience with data-dense or real-time dashboard interfaces (relevant to IoT products).

•   Experience mentoring junior developers formally.

Role & Responsibilities:

Design and develop mobile applications using React Native.

Collaborate with cross-functional teams to define, design, and ship new features.

Ensure performance, quality, and responsiveness of applications.

Debug and fix issues, improve application performance, and maintain code quality.

Work onsite with the client team in Trichy.

Requirements:

Minimum 2 years of hands-on experience in React Native mobile app development.

Strong knowledge of JavaScript/TypeScript and mobile UI/UX principles.

Experience with REST APIs, third-party libraries, and integration.

Ability to work independently and in a team environment.

Immediate availability preferred.

NEED TO HAVE :

1) Have some knowledge of front end like React.JS

2) HTML, CSS

3) Strong in JavaScript concepts

4) Good communication skills

5) Loves to code

GOOD TO HAVE :

1) Experience with type script will be a plus

2) Experience with Nest.JS framework will be a plus

3) Strong hold on ES6 principles.

4) Familiar with TDD ( Test Driven Development ) will be a plus.

5) Familiar with working in CI / CD will be a plus

6) Micro-Service architecture knowledge will be an added benefit.

You can contact me on this WhatsApp number: Nine three one six one two zero one three two

About Vijay Sales

Vijay Sales is a consumer electronics and appliances retailer, selling through its stores across India, its website and its app.

Our technology team builds the software the business runs on: order management, customer support automation over WhatsApp, reviews and ratings, and the dashboards our operations teams use every day.

The role

We are hiring full stack engineers who can take a feature from spec to production across React, Node.js and MongoDB.

You will work on customer-facing and internal products, often both in the same week. One sprint may be a review submission page used by customers on their phones. The next may be an API that pulls order status from our order management system for the support bot.

We are looking for engineers with 3 to 6 years of experience who are comfortable owning both the front end and the back end of what they ship.

What you'll do

• Build responsive, mobile-first interfaces in React using our in-house UI component libraries.
• Design and build REST APIs and background services in Node.js.
• Model data in MongoDB and keep queries fast as collections grow.
• Integrate with the systems the business runs on: order management, ERP, point of sale and ticketing.
• Build messaging flows over WhatsApp, email and SMS, including delivery tracking, retries and fallbacks.
• Work with the conversational AI team to expose order, invoice and support actions to the customer support bot.
• Write tests, review code and own your features in production, including monitoring and fixing what breaks.
• Work directly with product and operations teams to turn a business problem into a working release.

Our stack

React, Node.js and MongoDB are the core. Everything else in the table is what you will connect to or build alongside.

• Front end: React, with Vijay Sales' in-house UI component libraries
• Back end: Node.js services and REST APIs
• Database: MongoDB
• Messaging: WhatsApp Business, Amazon SES for email, RCS and SMS as fallback
• Conversational AI: LangChain and Rasa, behind the customer support bot
• Business systems: Order management (OMS), ERP, POS, Ticketing Systems

What we're looking for

• 3 to 6 years of professional experience building and shipping web applications.
• Strong JavaScript and TypeScript fundamentals: async patterns, the event loop, modules, error handling.
• Solid React skills: hooks, state management, component design, performance on low-end mobile devices.
• Hands-on Node.js experience: building REST APIs, authentication with JWT, role-based access, input validation.
• Working knowledge of MongoDB: schema design, indexing, aggregation pipelines.
• Experience integrating third-party APIs and webhooks, and handling their failures gracefully.
• Comfort with Git, code review, automated tests and CI/CD.
• Clear written and spoken communication. You will talk to operations and business teams, not only engineers.

Nice to have

• Experience with the WhatsApp Business API, Gupshup or similar messaging platforms.
• Exposure to LLM application development: LangChain, retrieval, tool calling, or bot frameworks such as Rasa.
• Background in retail, e-commerce or order management systems.
• Experience integrating with ERP or POS systems.
• Familiarity with AWS, Redis and message queues.
• React Native or other mobile app experience.

Why join and how to apply

• Your work reaches real customers and store teams quickly. There is very little distance between a release and the people who use it.
• You own features end to end, from the first conversation with the business team to production.
• You get hands-on exposure to conversational AI and LLM-based products alongside core full stack work.

Key Responsibilities

• Develop, maintain, and enhance cross-platform mobile applications for Android and iOS using React Native.
• Build responsive, user-friendly mobile interfaces with a strong focus on performance and usability.
• Integrate mobile applications with REST APIs and backend services.
• Work with React Native WebView to integrate web-based functionality into mobile applications.
• Implement navigation, state management, push notifications, deep linking, and other mobile app features.
• Debug, troubleshoot, and optimize applications for performance, stability, and reliability.
• Integrate third-party SDKs, libraries, and services into mobile applications.
• Work with native Android and iOS configurations when required.
• Manage app builds, releases, and deployments to the Google Play Store and Apple App Store.
• Collaborate with designers, backend developers, and the product team to deliver high-quality features.
• Write clean, reusable, and maintainable code while following development best practices.
• Participate in code reviews, testing, and continuous improvement of mobile applications.

Must-Have Qualifications

• Hands-on experience with React Native and mobile application development.
• Strong understanding of JavaScript, ES6+, and React fundamentals.
• Good knowledge of React Hooks, functional components, and state management.
• Experience integrating REST APIs and handling asynchronous operations.
• Familiarity with mobile navigation, app lifecycle, and platform-specific behavior on Android and iOS.
• Experience with Git and version control workflows.
• Understanding of responsive layouts, and mobile UI development.
• Knowledge of debugging, performance optimization, and error handling.
• Ability to troubleshoot issues independently and deliver reliable solutions.

Good-to-Have Qualifications

• Experience with TypeScript.
• Familiarity with React Native WebView and hybrid mobile applications.
• Experience with push notifications using Firebase Cloud Messaging or similar services.
• Knowledge of native Android development using Java/Kotlin or iOS development using Swift.
• Experience with Fastlane, CI/CD pipelines, and automated mobile app builds.
• Familiarity with publishing and maintaining apps on the Google Play Store and Apple App Store.
• Experience with Firebase, analytics, and third-party SDK integrations.
• Knowledge of Node.js and backend API development.

Soft Skills

• Strong problem-solving skills and attention to detail.
• Ability to learn new technologies and adapt to changing requirements.
• Good communication and collaboration skills.
• A proactive attitude with a willingness to take ownership of tasks.
• Ability to work effectively in a fast-paced startup environment.
• Passion for building high-quality mobile applications and improving user experiences.

Why Join Toolstr?

• Work with a fast-growing startup building products for the global Shopify ecosystem.
• Get hands-on experience building and shipping real-world mobile applications.
• Work on challenging technical problems across Android, iOS, and web technologies.
• Learn, grow, and take ownership of features from development to release.
• Be part of a collaborative team that values innovation, initiative, and continuous learning.

Job Description:

https://drive.google.com/file/d/12Fcie5u0rhyHeE_xhsNTeGk3mlPId1Mb/view?usp=drive_link