Senior Software Engineer - ReactJS

Job Title: Full Stack Engineer

Location: Delhi-NCR

Type: Full-Time

Responsibilities

Frontend:

• Develop responsive, intuitive interfaces using HTML, CSS (SASS), React, and Vanilla JS.
• Implement real-time features using sockets for dynamic, interactive user experiences.
• Collaborate with designers to ensure consistent UI/UX patterns and deliver visually compelling products.

Backend:

• Design, implement, and maintain APIs using Python (FastAPI).
• Integrate AI-driven features to enhance user experience and streamline processes.
• Ensure the code adheres to best practices in performance, scalability, and security.
• Troubleshoot and resolve production issues, minimizing downtime and improving reliability.

Database & Data Management:

• Work with PostgreSQL for relational data, ensuring optimal queries and indexing.
• Utilize ClickHouse or MongoDB where appropriate to handle specific data workloads and analytics needs.
• Contribute to building dashboards and tools for analytics and reporting.
• Leverage AI/ML concepts to derive insights from data and improve system performance.

General:

• Use Git for version control; conduct code reviews, ensure clean commit history, and maintain robust documentation.
• Collaborate with cross-functional teams to deliver features that align with business goals.
• Stay updated with industry trends, particularly in AI and emerging frameworks, and apply them to enhance our platform.
• Mentor junior engineers and contribute to continuous improvement in team processes and code quality.

About the Role

We are hiring an experienced MERN Stack Developer who can independently build and scale full-stack applications from scratch. The ideal candidate must have strong skills in TypeScript, React.js, Node.js, Redux, and REST APIs, along with a solid understanding of microservices architecture, mobile API integrations, and responsive design.

Experience with LLMs, RAG architecture, Kafka, Redis, webhooks, and database systems like PostgreSQL, MySQL, and MongoDB is essential. You’ll be working on scalable systems, enterprise-grade platforms, and AI-integrated products.

Key Responsibilities

• Develop and maintain full-stack web applications using React.js (with TypeScript) and Node.js (Express/NestJS)
• Build and document robust RESTful APIs and mobile-ready endpoints
• Implement and consume webhooks for third-party integrations and internal event-based workflows
• Ensure responsive design principles across devices and screen sizes
• Integrate with mobile applications via secure and scalable APIs
• Work with databases including PostgreSQL, MySQL, and MongoDB
• Integrate Large Language Models (LLMs) and Retrieval-Augmented Generation (RAG) pipelines
• Build and deploy microservices architecture using Kafka, Redis, Docker, etc.
• Manage application state using Redux or Redux Toolkit
• Write test cases using Mocha, Chai, Jest, or similar frameworks
• Participate in system design, architecture discussions, and scalability planning
• Follow Agile practices, perform code reviews, and contribute to CI/CD pipelines
• Collaborate with cross-functional teams including UI/UX, DevOps, QA, and Product Management

Required Skills & Experience

• Minimum 4 years of hands-on experience with the MERN stack
• Strong proficiency in TypeScript, React.js, Node.js, and Redux
• Proven experience in building and consuming REST APIs and webhooks
• Deep knowledge of responsive UI/UX development
• Hands-on experience with mobile-first API design and integrations
• Strong knowledge of PostgreSQL, MySQL, and MongoDB
• Experience with Kafka, Redis, Docker, and microservices
• Exposure to LLM, GPT, RAG, or similar AI models
• Solid understanding of software architecture and ability to build systems from the ground up
• Working knowledge of API security, JWT, OAuth, and rate-limiting
• Familiar with test-driven development and QA practices
• Familiarity with Git, version control, and collaborative workflows good to Have
• Experience with GraphQL and gRPC
• Experience in building SaaS or AI-integrated platforms
• Familiarity with ElasticSearch or RabbitMQ
• Experience with AWS, GCP, or Azure
• Understanding of serverless and event-driven architectures
• 
  

Benefits

• Competitive compensation with performance-based hikes
• Flexible remote or hybrid work options
• Opportunity to work on cutting-edge technologies including AI and scalable SaaS platforms
• Strong leadership and learning-driven environment
• Learning budget for courses, certifications, and conferences

Join the team of a fast-growing fintech organization that has recently raised $25M via equity and debt fund to rapidly increase the ever-growing space of Fintech World.

A financial technology platform made up of the most knowledgeable, passionate, and creative people in our business. We recognize the power of financial services to break down barriers and make it easy for customers to avail banking, investments, and lending solutions – that responsibility inspires us to be the place where exceptional people want to do their best work and to provide them the tools to do so.

Looking for motivated, highly driven, and hardworking Software Engineers for the Neobanking platform for a leading Fintech organization in a highly collaborative, fast-paced, high-energy environment. You will build the platform for user onboarding, profile management, banking, lending, risk mitigation, and analytics for driving intelligence from customer interaction patterns. It’s an exciting time to join the team as we’re setting about building the next generation of our platform.

• Design and implement scalable server-side solutions using Java.
• Write optimized front-end code using HTML, CSS, and Javascript
• Write unit, automation, and integration tests
• Implement quality application logging for operational monitoring at scale
• Investigate, debug and resolve production site issues
• Work with co-located teammates to deliver on common goals

• Professional experience in enterprise Java software development using Spring MVC frameworks, RESTful APIs, and SOA
• Proficiency in HTML/CSS/JavaScript/jQuery
• Experience with Docker and Kubernetes
• Experience with Microservices
• Experience with DevOps Technologies is plus
• Experience with Selenium for UI automated tests written in Cucumber or Scala
• Working knowledge of design patterns and CI/CD principles
• First-class communication skills in written and verbal form
• Outstanding problem-solving skills
• A commitment to producing high-quality code with an attention to detail
• Dedication and a self-motivated desire to learn
• A collaborative, team-orientated attitude
• 3-8 years of professional experience in Java software development
• Experience working in the Cloud (AWS)
• API development experience
• Exposure to monitoring tools such as ELK, Splunk

About HighLevel:  

HighLevel is a cloud-based, all-in-one white-label marketing and sales platform that empowers marketing agencies, entrepreneurs, and businesses to elevate their digital presence and drive growth. With a focus on streamlining marketing efforts and providing comprehensive solutions, HighLevel helps businesses of all sizes achieve their marketing goals. We currently have 1000+ employees across 15 countries, working remotely as well as in our headquarters, which is located in Dallas, Texas. Our goal as an employer is to maintain a strong company culture, foster creativity and collaboration, and encourage a healthy work-life balance for our employees wherever they call home.

About the Role:

We are looking for an experienced software engineer with strong technical and communication skills who has developed full stack web apps, created solid APIs and beautiful interfaces for consuming them in user friendly apps. Focusing on details and well written self documented code are essential for this position. You can expect to collaborate with a solid team of designers, product managers, developers and testers on a daily basis. You must be experienced in building highly scalable and resilient systems that can meet our customer needs.

Responsibilities

• Improve and create new lead capture domain models.
• Build backend & Frontend API features and architecture.
• Work cross-functionally across our platform, experience, integrations, payments and marketplace teams.
• Drive performance through benchmarking and optimization
• Work with a wide range of systems, processes, and technologies to own and solve problems from end to end
• Collaborate closely with our leadership team including engineers, designers, and product managers to build new features and products
• Uphold high engineering standards and bring consistency to the many codebases and systems you will encounter.
• Work on 1 to 2 products.
• Create and improve lead capture tools like funnels, websites, forms, surveys, social media
• Architect and build backend & Frontend APIs and features

Your Core Skills

• 4+ years of experience in a full-stack environment.
• Proficient with various programming languages and tools such as but not limited to Javascript, TypeScript, Vue.js, NodeJS, and GraphQL
• Must be able to work with a team and collaborate remotely.
• You have an entrepreneurial mindset, are eager to take on different roles when necessary and know how to navigate a start-up environment.
• You are fulfilled by being a generalist working on both the frontend, backend, and anything it takes to solve problems and delight users and take pride in working on projects involving a variety of technologies and systems.
• Ability to stitch together many different services and processes together, even if you have not worked with them before.
• Hold a great deal of empathy for your team and users, you are a steward of crafting great experiences.
• Have great communication skills and can thrive in a highly collaborative environment when working cross-functionally with many stakeholders.
• Driven by product quality, and innately know how to balance trade-offs with time to launch new features.
• A keen eye for design and love to think about user flows and user experiences.
• Must have experience with HTML5 and CSS3

Additional Skills

• Experience with the Nuxt.js framework is a plus.
• Experience with MongoDB profiling and query optimization.
• Using CSS frameworks such as Bootstrap and TailwindCSS
• Experience working in the GCP (Google Cloud Platform) ecosystem.

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.

• You're proficient in Node.js/Javascript with a strong foundation in NoSQL/ SQL 
• You're proficient in React and strong frontend javascript foundation 
• Knowing GoLang and/or Solidity is a definite plus but not a requirement
• You have a passion for writing code as well as understanding and crafting the ways systems interact
• You have experience deploying to and implementing solutions in AWS
• You believe in the benefits of agile processes and shipping code often
• You are pragmatic and work to coalesce requirements into reasonable solutions that provide value

• Deploy well-tested, maintainable and scalable software solutions
• Take end-to-end ownership of the technology stack and product 
• Collaborate with other engineers to architect scalable technical solutions
• Embrace and improve our standards and processes to reduce friction and unlock efficiency

Current Ecosystem : 
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Game: Shiba Eternity on iOS and Android

Php and framework full stack developer

Knowledge of Nodejs and python an added advantage

Understands ci cd and webapp deployment

Aws development and deployment understanding

Javascript understanding

Roles and Responsibilities

• Strong proficiency in Java and building scalable enterprise applications
• Can think of architectural design at scale
• Love solving complex and challenging problems
• Have good knowledge of design and architectural patterns
• Thrive to implement Industry’s best practices and coding standards
• High obsession for Quality and Performance
• Good knowledge on performance optimization, SQL tuning, caching techniques
• Like to collaborate with people, share knowledge, learn from others and mentor juniors

In Brief
Urgent Hiring • Re-location Required
Company Founded 2018 • 1-5 employees
Internet and Technology Startup • Bootstrapped

About us
Based out of Egypt and with presence in the GCC, Quesst Technologies is an early Internet and Tech Startup committed to helping thousands of nationals, residents and travelers in the MENA region, saving them time and effort in seeking reliable and credible knowledge within their communities and localities.

Quesst, the company's flagship platform, is a hyper-local Q&A and knowledge sharing platform that offers the necessary infrastructure for users seeking information to meet, share, engage and interact with one another and with verified subject matter experts.

Who we're looking for
Ideally the successful candidate will have experience in the start-up world and is in a position for a new challenge to take this company to the next level. Someone who is passionate about delivering a scalable and highly performant state-of-the-art cloud-based platforms built with technologies utilizing the JavaScript ecosystem, AI/ML and the latest web technologies to help solve exciting real world problems.

We are looking for an agile and entrepreneurial leader with strong people leadership and technical capability who has a problem-solving and analytical aptitude, excellent communication and presentation skills, is familiar with statistics, has a business acumen, independent, positive can-do attitude, and passion for excellence to the workplace.

Your role and our tech stack
Reporting to the founder, you will be expected to develop, deploy and oversee the execution of the tech strategy, product road-map and operations to ensure alignment with our businesses goals as we grow and scale. You will play a key part in the organisation's success, taking the current MVP and developing it further to move the company through to early stage funding and into profit.

Quesst's is built using React.js [Frontend], Node.js [Backend], PostgreSQL [DB], Amazon EC2 [Application Hosting], Amazon S3 [Media Storage Service], and Amazon SES [Email Sending Service]. You will be responsible for implementing full-stack features and collaborate with other team members to plan each sprint. You’ll be working across the entire system architecture and be responsible for designing, implementing and maintaining restful APIs, micro-services and databases.

Your key responsibilities

• Develop, improve and optimize the structure, quality, and extensibility of current software technologies, codebases and databases
• Prototype ideas to quickly access viability and iterate based on feedback from the team
• Build robust, web-based applications interacting with databases, file-systems and APIs
• Write custom code or integrate open source technologies as needed to find solutions to problems
• Design and build effective APIs; Create servers and databases for functionality
• Design client-side and server-side architecture; Design the data model ensuring scalability
• Accurately translate screen designs into functional front-end code; Develop features and with a mobile responsive design
• Write high-quality, extensible, testable and reusable code and libraries; Conduct code reviews and establishment of best practices
• Participate in planning activities; Estimate accurate stores for new features and design product features
• Help define processes and build tools as needed to scale the solution and the team
• Create and lead the product road-map; Proactively breakdown work, manage development sprints, identify risks and explore solutions
• Test software to ensure responsiveness and efficiency; Troubleshoot, debug and upgrade software; Aggressive problem diagnosis and creative problem solving
• Steer the business on timescales, prioritization and costs on competing development requirements
• Drive rigorous, and weekly product releases and lead required integration efforts with partners and/or third-party software services
• Guide the development in design, architecture and platform choices with strong focus on quality, speed, stability and scalability
• Identify and establish best practices and frameworks keeping in mind parameters of performance, responsiveness, security, maintainability, extensibility, and reuse; Work collaboratively in a lean and agile environment; Write technical documentation
• Recommend and implement new technologies, improvement of existing tech and set-up and future-proofing our technology that can help the company optimize efficiency and productivity and lead edge thinking and knowledge of innovative technologies i.e. AI, ML, blockchain, etc..

Your qualifications

• Minimum of BSc in Computer Science/IT/Electronics/Software Engineering or a comparable degree program
• Proven experience of 2-5 years of full-stack development of web applications; 2+ years building front-end interfaces with React.js & Redux workflows and 2+ years building back-end and maintaining server applications on Node.js, PostgreSQL and designing APIs
• Expert in traditional web-dev stack (HTML5, CSS3, JS); Strong in core JavaScript (ES5, ES6, ESNext, TypeORM and Typescript) and JS object model
• Experience with Linux environments and using the shell and command line terminals (preferred)
• Professional coding experience in object-oriented and scripting languages; Extensive experience building client-side web applications using React
• Proficient with:
  • JavaScript Frameworks (ReactJS/NextJS/Redux) and Node.js Frameworks (Express.js)
  • Client-side MVC frameworks such as NodeJS, React JS, NextJS, Redux, and AngularJS; Knowledge of isomorphic React
  • Configuration of various servers to run web application servers, databases, etc.; Web server technologies like Nginx, NodeJS, Apache, etc.
  • Frontend CSS frameworks like Bootstrap, Material UI and preprocessors like SASS and SCSS/LESS
  • Writing and integrating middleware; Experience with Redux Saga and Thunk
  • Architecture, design, queries of Relational databases (PostgreSQL, MySQL and other RDBMS)
  • Modern JS tooling (NPM, Webpack, Babel, ESLint and Prettier)
  • Developer tools, such as Visual Studio Code
  • Code versioning tools and Git version control systems (Github); Containerization systems (Docker)
  • Strong in data structures, XML technologies, JSON parsing
  • Caching frameworks and mechanisms, work-task queues, transactions and messaging queues (Redis, Memcached, RabbitMQ and others)
  • Building real-time applications using Web Sockets (Socket.io)
  • Web and mobile push notifications and cloud message APIs (GCM, APNS, OneSignal, etc.)
  • Setting up cron jobs and schedule task execution
  • Handling Services, RESTful, APIs, third party libraries and APIs (Google APIs, AWS, Zendesk, etc.)

• Experience with API gateway, distributed infrastructure architectures and applications tuning/profiling; Experience working with microservices
• User authentication and authorization between multiple systems, servers, and environments; Understanding of “session management” in a distributed server environment
• Experience with REST API and web service construction, integration and architecture and working with remote data via REST and JSON
• Knowledge of modern authorization mechanisms, such as JSON Web Token, Authentication and Security Technologies
• Familiarity with building secure systems (OWASP secure coding practices or similar)
• Architect and cloud-deploy applications on AWS and other cloud providers
• Deep understanding of Test-Driven Development (TDD)
• Build and manage end-to-end and UI tests; Experience writing tests (unit, integration, functional, etc.), and using testing frameworks
• Build third-party integrations like Slack, Stripe, Google and supporting their workflow
• Provision DevOps tooling with continuous integration; Build modern Front-end build pipelines and tools
• Contribute to API documentation including API description languages like Swagger; Document and diagram functional flows and architectures
• Experience in building rich PWA applications; Experience in responsive design, cross browser compatibility and website performance
• Understanding of how browsers and DOM work; Understanding and experience with asynchronous processing, partial page refresh, DOM traversal and manipulation
• Expert level using Web Analytics tools (Google Analytics and others); Experience with open source software development
• Experience with localization and internationalization of applications (working with multi-site setups, multi-language, i18n, etc.)

Some desired extras and good to have skills

• Knowledge of cyber-security, malware analysis, threat detection and/or sandboxing technology
• Preferably has knowledge of working in big data (Spark, Kafka, Hadoop) and machine learning ecosystems
• Strong background in security and data analytics and on-premise data experience
• Experience and familiarity with:
  • Architecture, design, queries and aggregation of NoSQL databases (MongoDB, Cassandra and others)
  • Elasticsearch and ELK stack
  • Developing integrations for global OTAs
  • OpenAPI
• Knowledge of multiple backend languages and framework

We offer you

• A unique entrepreneurial opportunity to build something from the ground up and scale it up to a major regionally recognizable brand
• A great learning curve in a collaborative environment with no barriers for initiatives
• Leading compensation package including salary free of local taxes, accommodation allowance for local hire or shared accommodation for international hire, free medical care from company physician, free government healthcare membership, transport allowance, paid airfare to the country of origin, paid leave and end of service according to local labor law.

Your professional career growth opportunities
As you help us grow Quesst, we will help you grow and professionally develop. Joining us at this stage, you will have the opportunity to be part of the core team if you prove you have what it takes and will be given the opportunity to:

• Lead and develop a technical strategy for the company, which involves goal setting, discussing options, and analyzing risks with the management team, CEO and board members
• An opportunity to build and manage a business unit from scratch and scale it up to success at a regional level
• Attract and retain top tech talent, mentor and manage the team as it grows
• Develop and manage KPIs for the tech team and create a challenging work environment

Have we caught your attention?
Send us your application including your resume, salary expectations and earliest starting date.

We’re looking forward to your application!