Full Stack MERN Developer

About us

We build Shopify apps used by serious e-commerce brands — streetwear, fashion, lifestyle.

We’re a small, profitable company. No layers. No performative meetings. Just real merchants, real revenue, and problems that actually matter. If you like working close to the product (and not buried under process), you’ll fit in.

What you’ll actually do (for real)

• Build and ship core product features (mostly backend, some frontend)
• Work on business-critical flows: orders, inventory, webhooks, async jobs
• Debug real production issues — not toy problems
• Take ownership of features from idea → production → iteration
• Collaborate directly with founders on product decisions

Tech stack (what we use today)

• Backend: Node.js
• Database: MongoDB, Apollo
• Infrastructure: AWS (Lambda, SQS), Redis
• Frontend (secondary): React

You don’t need to know everything here — but you should be comfortable learning fast.

What we’re looking for

You should have:

• 2–5 years of real production experience
• Experience shipping features that real users depended on
• Comfort reading and improving existing codebases
• Solid fundamentals (async flows, APIs, data handling)
• Ability to work independently without hand-holding

Bonus points if you:

• Have worked on SaaS or B2B products
• Understand e-commerce, payments, or inventory flows
• Enjoy improving performance, reliability, or developer experience

Why join us?

• Real ownership — your code goes live and stays live
• High learning curve — exposure to product, infrastructure, and scale
• Remote & async-friendly — trust over tracking
• Competitive pay (full-time or consultant option for tax efficiency)

This role is ideal if you want to grow fast by building real systems, not by sitting in meetings.

When life gives you lemons and you can code both front and back with equal zest, you’re probably a Full Stack Developer we’d love on our team.

At Lemon Yellow, we’re looking for someone who thrives on building end-to-end web solutions using the MERN stack. From crafting intuitive front-ends to developing efficient, scalable back-end systems, you’ll be involved in shaping digital products from the ground up. If turning design mockups into pixel-perfect, high-performance applications excites you, we’re ready to build with you.

1. Core Responsibilities

• Build and maintain end-to-end web applications using the MERN stack.
• Act as a bridge between design and development to bring ideas to life with clean, scalable code.
• Support digital campaigns through intuitive and functional tech implementations.
• Design, develop, and deploy scalable front-end and back-end components.
• Write clean, maintainable code while collaborating with designers, marketers, and other developers.
• Translate product requirements and UI/UX wireframes into fully functional digital solutions.

2. API & Integration Management

• Implement RESTful APIs and connect third-party tools and services.
• Ensure smooth data exchange across platforms through secure integrations.
• Manage user authentication and authorization using mechanisms like JWT or OAuth.

3. Code Quality & Optimization

• Debug, profile, and optimize applications for performance and reliability.
• Maintain unit and integration test coverage for code robustness.
• Conduct code reviews and help improve internal coding standards.

4. Agile Collaboration

• Actively participate in agile activities: daily stand-ups, sprint planning, retros, and demos.
• Contribute to task estimation and cross-functional problem-solving.
• Stay responsive to project shifts and quick delivery needs.

5. Continuous Learning & Innovation

• Stay up to date with the latest development trends, tools, and practices.
• Share learnings and explore creative solutions for technical challenges.
• Experiment with emerging technologies and suggest process improvements.

Requirements

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• Minimum 1 year of hands-on experience building production-ready web applications using MongoDB, Express.js, React.js, and Node.js.
• Strong command of JavaScript (ES6+), HTML5, and CSS3.
• Experience with Git and version control systems
• Familiarity with RESTful API design, JSON, and authentication mechanisms (JWT, OAuth)
• Familiarity with cloud platforms (AWS, Azure, or GCP) and containerization (Docker).
• Basic understanding of CI/CD pipelines and automated testing.
• Strong analytical and problem-solving mindset.
• Detail-oriented with a passion for clean, maintainable code.
• Collaborative attitude with good verbal and written communication skills.

What are we offering?

Experience

• A chance for you to work in a thriving and growing environment. We foster a culture where growth is harmonious and creativity is always appreciated - you grow and you encourage others to do the same.

Exposure

• If you believe in your work, we believe in you. If you think your designs have the power to change the world, we'll help you bring your vision to life and give you the platform to prove it.

Empathy

• We have a carefully curated culture that promotes 2 things: fun & fulfilment. Your welfare - personal, professional, mental, and physical - becomes our responsibility. From Fitness Thursdays to learning sessions, we try to make you laugh & learn.

Who are we?

Lemon Yellow LLP is a user-centered UI/UX design agency, based out of Thane, Maharashtra. With international operations, an experienced mentorship, and a passionate team, we aim to design digital happiness.

How do you reach us?

Well, after you send in your application, it takes us 2-3 weeks to review it. Sometimes, not often, we might delay just a bit beyond that. This happens when our mailbox is flooded with applications.

We promise we won’t ghost you, you’ll definitely hear from us. In the meantime, feel free to explore our official website.

Looking for a 5+ years experienced Senior Full-stack Engineer (Backend Heavy) for a research-focused, product-based, US-based Startup.

AI Assistant for Research using state-of-the-art language models (AI Agent for Academic Research)

At SciSpace, we're using language models to automate and streamline research workflows from start to finish. And the best part? We're 

already making waves in the industry, with a whopping 5 million users 

on board as of November 2025! Our users love us too, with a 40% 

MOM retention rate and 10% of them using our app more than once 

a week! We're growing by more than 50% every month, all thanks to 

our awesome users spreading the word (see it yourself on Twitter). Andwith almost weekly feature launches since our inception, we're 

constantly pushing the boundaries of what's possible. Our team of 

experts in design, frontend, fullstack engineering, and machine learning

are already in place, but we're always on the lookout for new talent to help us take things to the next level. Our user base is super engaged and always eager to provide feedback, making Scispace one of the most advanced applications of language models out there.

We are looking for insatiably curious, always learning SDE 2 Fullstack Engineers. You could get a chance to work on the most important and challenging problems at scale.

Responsibilities:

* Work in managing products as part of SciSpace product suite.

* Partner with product owners in designing software that becomes part of researchers’ lives

* Model real-world scenarios into code that can build the SciSpace platform

* Test code that you write and continuously improve practices at SciSpace

* Arrive at technology decisions after extensive debates with other engineers

* Manage large projects from conceptualisation, all the way through deployments

* Evolve an ecosystem of tools and libraries that make it possible for SciSpace to provide reliable, always-on, performant services to our users

* Partner with other engineers in developing an architecture that is resilient to changes in product requirements and usage

* Work on the user-interface side and deliver a snappy, enjoyable experience to your users

Our Ideal Candidate would:

* Strong grasp of one high-level language like Python, JavaScript, etc.

* Strong grasp of front-end HTML/CSS, non-trivial browser-side JavaScript

* General awareness of SQL and database design concepts

* Solid understanding of testing fundamentals

* Strong communication skills

* Should have prior experience in managing and executing technology products.

Bonus:

* Prior experience working with high-volume, always-available web applications

* Experience in ElasticSearch.

* Experience in distributed systems.

* Experience working with a Start-up is a plus point.

What You’ll Be Doing

• 🛠 Write code for web and mobile apps, fix bugs, and work on features that people will actually use.
• 💡 Join brainstorming sessions and help shape our products.
• 🚀 Things move fast here, and you’ll learn as you go.
• 🤝 Work closely with everyone—designers, developers, and even marketing folks.
• 🔧 Diving into Our Tech Stack: React, React Native Node, Express, Python, FastAPI, and PostgreSQL.

What We’re Looking For

We’re not looking for perfection, but if you’re curious, motivated, and excited to learn, you’ll fit right in!

For Backend Engineers

• 💻 Strong knowledge of Python, FastAPI, and PostgreSQL.
• 🔍 Solid understanding of Low-Level Design (LLD) and High-Level Design (HLD).
• ⚡ Ability to optimize APIs, manage databases efficiently, and handle real-world scaling challenges.

For Frontend Engineers

• 💻 Expertise in React Native.
• 🎯 Knowledge of native Kotlin (Android) and Swift (iOS) is a big bonus.
• 🚀 Comfortable with state management, performance optimization, and handling platform-specific quirks.

General Expectations for All Engineers

• 🛠 While you’ll be specialized in either frontend or backend, you should be good enough to fix bugs in both.
• 🔍 You enjoy figuring things out and experimenting until you get it right.
• 🤝 Great communication skills and a collaborative mindset.
• 🚀 You’re ready to dive in and make things happen.

Interview Process

If we like your application, Be ready to:

1. Solve a data structures and algorithms (DSA) problem in your preferred programming language.
2. Answer questions about your specialized area (frontend/backend) to showcase your depth of knowledge.
3. Discuss a real-world problem and how you’d debug & fix an issue in both frontend and backend

Why Join Us?

• 💡 Your work will matter here—no busy work, just real projects with real outcomes.
• 🚀 Help shape the future of our company.
• 🎉 We’re all about solving cool problems and having fun while we do it.

We're seeking an experienced Senior Tech Lead to oversee both frontend and backend teams for a production-ready enterprise project. You should possess strong managerial skills along with an entrepreneurial mindset. In this dynamic role, you'll collaborate with cross-functional teams to design, build, and deploy products aligned with our vision and strategy. Your leadership will be key in driving product success from conception to launch, ensuring they meet business objectives and user expectations.

Experience: 7+ Year

Working Time: 12.30 PM to 9.30 PM

Responsibilities:

• Lead and mentor developers: Provide guidance and support to ensure high-quality deliverables and drive engineering best practices. Experienced in leading development teams, fostering collaboration, and mentoring junior engineers for adherence to best practices.
• Collaborate with cross-functional teams: Define project requirements, timelines, and priorities, and coordinate product releases.
• Architect scalable solutions: Design systems for both frontend and backend that are maintainable using modern architecture patterns and RESTful API design principles.
• Project Management Skills: Proficient in Agile methodologies, managing timelines, and prioritizing tasks effectively to ensure project success.
• Define product features: Set sprint goals and translate user feedback into actionable enhancements.
• Problem-Solving Skills: Analytical problem-solver adept at addressing technical challenges and implementing practical solutions.
• Analyze data: Validate product goals and adapt strategies accordingly, and track project progress to ensure timely delivery of features.
• Test and accept product features: Ensure accurate implementation of product features based on user stories.

Requirements

• Bachelor's / Master’s degree in Computer Science or related field.
• Minimum of 3 years of experience in a leadership role.
• Nice to have: Experience in building a product from concept to launch.
• Excellent communication and interpersonal skills, with the ability to collaborate effectively across teams.
• Strong proficiency in NodeJS, RESTful APIs, Weaviate Vector Database, and graph databases.
• Proficient in NestJS with full lifecycle experience and expertise in MongoDB integration.
• Proficient in MongoDB, with expertise in NoSQL principles, instance management, data modeling, and efficient query optimization for cloud and on-premise environments.
• Strong proficiency in ReactJS, NextJS, MaterialUI, and React Query.
• Proficient in TypeScript development, skilled in building type-safe applications and leveraging TypeScript configurations for enhanced development efficiency.
• Proficient in AWS services, specializing in Lambda for serverless computing, API,Gateway for secure API management, and integration with IAM, S3, and CloudWatch.
• ​Knowledge of CI/CD principles and tools to automate the testing and deployment of applications.

Benefits

• Gain real-world experience in corporate functioning.
• Learn to collaborate with diverse teams and meet deadlines in a professional environment.
• Access various learning and development programs to explore your passion.
• Work in a fast-paced, rapidly expanding tech team undergoing a revamp, with exposure to advanced technology and tools relevant to your role

A full-stack developer is a versatile professional who has expertise in both front-end and back-end web development. They are responsible for building and maintaining all aspects of a web application or software product. Here are some key roles and responsibilities typically associated with full-stack developers:

1. Front-end Development:

• User Interface (UI) Design: Designing the user interface of web applications to ensure they are visually appealing and user-friendly.
• HTML/CSS: Creating the structure and styling of web pages using HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets).
• JavaScript: Writing client-side code to add interactivity and functionality to web applications. Knowledge of popular JavaScript frameworks and libraries like React, Angular, or Vue.js is often required.

1. Back-end Development:

• Server-side Programming: Developing server-side logic and APIs (Application Programming Interfaces) using programming languages like Python, Java, Ruby, Node.Js(Node), or React Js(React).
• Database Management: Designing and managing databases, including creating schemas, writing SQL queries, and using database management systems like MSSQL, PostgreSQL, MongoDB, or SQL Server.
• Server Configuration: Setting up and configuring web servers, such as Apache, Nginx, or IIS, and deploying applications.

1. Integration and APIs:

• Building and integrating third-party APIs and services into web applications.
• Developing RESTful or GraphQL APIs to allow communication between the front-end and back-end components.

1. Version Control:

• Using version control systems like Git to track changes in code and collaborate with other developers.

1. Security:

• Ensuring the security of web applications by implementing authentication, authorization, and other security measures.
• Protecting against common web vulnerabilities like SQL injection, cross-site scripting (XSS), and cross-site request forgery (CSRF).

1. Testing and Debugging:

• Writing unit tests, integration tests, and performing debugging to ensure the reliability and quality of the code.

1. Deployment and DevOps:

• Deploying web applications to production servers and managing the deployment process.
• Familiarity with DevOps practices, including continuous integration and continuous delivery (CI/CD), is often beneficial.

1. Performance Optimization:

• Identifying and addressing performance bottlenecks in web applications to ensure optimal speed and responsiveness.

1. Collaboration:

• Collaborating with designers, product managers, and other team members to understand project requirements and deliver functional solutions.

1. Maintenance and Updates:

• Regularly updating and maintaining web applications to ensure they remain compatible with evolving technologies and security standards.

1. Documentation:

• Creating documentation for code, APIs, and system architecture to facilitate future development and troubleshooting.

1. Problem Solving:

• Full-stack developers need strong problem-solving skills to diagnose issues, implement solutions, and adapt to evolving project requirements.

1. Continuous Learning:

• Staying updated with the latest web development trends, tools, and technologies to enhance skills and deliver cutting-edge solutions.

Full-stack developers play a crucial role in the development lifecycle of web applications, from conceptualization and design to deployment and ongoing maintenance. Their ability to work on both front-end and back-end components makes them valuable assets in web development teams.

• Proven experience as a Full Stack Developer or similar role
• Experience developing desktop and mobile applications
• Familiarity with common stacks
• Knowledge of multiple front-end languages and libraries (e.g. HTML/ CSS, JavaScript, XML, jQuery)
• Knowledge of multiple back-end languages (e.g. C#, Java, Python) and JavaScript frameworks (e.g. Angular, React, Node.js)
• Familiarity with databases (e.g. MySQL, MongoDB), web servers (e.g. Apache) and UI/UX design
• Excellent communication and teamwork skills
• Great attention to detail
• Organizational skills
• An analytical mind
• Degree in Computer Science, Statistics or a relevant field

• Join the product research team to develop the leading Geodata and GeoAI platform in Hong Kong
• Be part of the product team to develop web front-end interface with a focus of data and AI application
• Develop automated software in Arical data and AI pipeline
• On job training for rapid product development cycle
• Will have to deliver reliable and maintainable code
• Use analytical skills effectively for hands on problem solving
• Translate UI/UX design wireframes to actual code
• Work with UI/UX designer

• Degree or above in Computer Science, Information Systems, or related fields
• Coursework in programming, data science, machine learning, AI and databases
• Strong organizational and project management skills
• Proficiency with client-side scripting and database technology

• Knowledge of one or more system programming languages (Python, C++, Java, etc)
• Knowledge of MongoDB and other NoSQL data stores such as Redis
• Proficiency with HTML, CSS, JavaScript, cross-browser optimization
• Proficiency with one or more front-end web development framework (Bootstrap, Angular, React)
• Knowledge of one or more web-scripting languages (PHP, Rudy, Node.js etc)
• Knowledge of web-scraping library (Beautiful Soup, web driver etc)
• Knowledge of API packaging and Docker deployment
• Knowledge of app development
• Knowledge of UI/UX design

• Work from home

We are looking for ambitious hands-on coders who love building web based applications from the ground up and have a special affection for all things JavaScript.

Responsibilities:

• Develop robust, web-based applications interacting with database filesystems and APIs
• Obsess about code quality and readability
• Remain updated on new and evolving client-side technologies, their application to our functionality or architecture goals
• Work closely in a multi-disciplinary structure to deliver world class solutions across web, mobile, and tablets
• Identify and establish best practices and frameworks keeping in mind parameters of performance, responsiveness, security, maintainability, extensibility, and reuse

Must have:

• At least 3 years of experience in developing web based applications with experience in Node.Js
• Skilled at Object Oriented JavaScript and having a working knowledge of at least one of the following MVC Frameworks (Angular, Backbone, Ember, React etc.).
• Knowledge of database, preferably some NoSQL DB like Mongo.
• Familiar with Git version control system