Mean Stack Developer

Senior Full Stack Developer

Location: India, Remote

Employment Type: Contract

Department: Engineering

About Us

OpenAssets is building open standards for the next generation of capital markets, providing the trusted foundation for real-world asset tokenization and digital currencies.

We design regulatory-conscious solutions for alternative asset digitization and loyalty programs, enabling organizations to create secure, scalable digital assets and personalized engagement experiences.

Join OpenAssets and help shape the future of digital finance!

Overview

OpenAssets is seeking a Senior Full-Stack Developer to own end-to-end delivery across our multi-tenant platform. This is a hands-on engineering role spanning the full MERN stack: MongoDB schemas, Node.js services, and React.js operator and investor interfaces with working knowledge of EVM-based blockchain systems to support on-chain integrations.

The ideal candidate brings deep experience designing and shipping production systems end-to-end, optimizing backend and frontend performance, integrating with EVM blockchains, and mentoring engineers in a distributed, fast-moving environment.

What You'll Do

• Design, develop, and maintain full-stack web applications across the MERN stack: MongoDB, Express.js, React.js, and Node.js using TypeScript on both client and server
• Build and maintain RESTful APIs with consistent error handling, pagination, versioning, and authentication
• Model, index, and optimize MongoDB schemas using compound indexes, aggregation pipelines, and transactions on replica sets
• Develop responsive React.js user interfaces using modern patterns including hooks, state management, and component-level testing
• Implement authentication and authorization using JWT and role-based access control with secure middleware patterns and OWASP-aligned input validation
• Integrate with EVM-based blockchain systems (Ethereum, Polygon, Arbitrum, Base), including wallet interactions, transaction lifecycle handling, and on-chain/off-chain reconciliation
• Deploy and operate services on AWS using Docker and CI/CD pipelines, with structured logging, monitoring, and on-call participation
• Write automated tests (unit, integration, end-to-end) using Jest, Mocha, Supertest, or similar frameworks
• Conduct code reviews, mentor mid-level engineers, and contribute to engineering documentation and best practices
• Collaborate with product, design, and engineering leadership across time zones to scope features, define API contracts, and deliver end-to-end

Qualifications & Experience

• 8+ years of full-stack development experience
• Strong expertise in MongoDB, Express.js, React.js, Node.js, and TypeScript across both client and server
• Experience designing and operating RESTful APIs and frontend integrations at scale
• Hands-on experience with MongoDB data modeling, compound indexes, aggregation pipelines, and replica-set transactions
• Proficiency in:
• JWT/OAuth-based authentication and role-based access control
• Secure middleware patterns and OWASP-aligned input validation
• Pagination, query optimization, and performance tuning
• Experience integrating with EVM-based blockchain systems (Ethereum, Polygon, Arbitrum, Base), including wallet interactions, transaction lifecycle handling, and on-chain/off-chain reconciliation
• Hands-on experience with AWS infrastructure (EC2, ECS, Lambda, S3, CloudWatch, IAM)
• Familiarity with Docker, GitHub Actions, and modern CI/CD workflows
• Experience writing automated tests across unit, integration, and end-to-end layers using Jest, Mocha, Supertest, Playwright, or Cypress
• Solid understanding of backend and frontend security practices
• Strong ownership mindset and accountability
• Ability to drive technical execution independently and mentor mid-level engineers
• English fluency

Nice to Have

• Fintech, capital markets, or payments experience 
• MongoDB Atlas certification or replica-set tuning expertise
• EVM developer tooling (ethers.js, Hardhat, Foundry)
• Tokenized securities or on-chain asset issuance
• Multi-tenant SaaS architecture
• Event-driven systems (Kafka, SQS, BullMQ)
• GraphQL
• Performance engineering (keyset pagination, caching, Redis) 
• Distributed tracing (OpenTelemetry)
• Infrastructure as code (Terraform, Pulumi, CDK)
• Open-source contributions or technical writing
• CS-related Bachelor's degree
• AWS certifications
• Prior remote-first startup experience.

We are committed to providing equal opportunity for qualified applicants to contract positions, regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status. This is a contract opportunity, not a direct employment role.

AI-Native Software Developer Intern

Build real AI agents used daily across the company

We’re looking for a high-agency, AI-native software developer intern to help us build internal AI agents that improve productivity across our entire company (80–100 people using them daily).

You will ship real systems, used by real teams, with real impact.

If you’ve never built anything outside coursework, this role is probably not a fit.

What You’ll Work On

You will work directly on designing, building, deploying, and iterating AI agents that power internal workflows.

Examples of problems you may tackle:

Internal AI agents for:

• Knowledge retrieval across Notion / docs / Slack
• Automated report generation
• Customer support assistance
• Process automation (ops, hiring, onboarding, etc.)
• Decision-support copilots
• Prompt engineering + structured outputs + tool-using agents

Building workflows using:

• LLM APIs
• Vector databases
• Agent frameworks
• Internal dashboards
• Improving reliability, latency, cost, and usability of AI systems
• Designing real UX around AI tools (not just scripts)

You will own features end-to-end:

• Problem understanding
• Solution design
• Implementation
• Testing
• Deployment
• Iteration based on user feedback

What We Expect From You

You must:

• Be AI-native: you actively use tools like:
• ChatGPT / Claude / Cursor / Copilot
• AI for debugging, scaffolding, refactoring
• Prompt iteration
• Rapid prototyping
• Be comfortable with at least one programming language (Python, TypeScript, JS, etc.)
• Have strong critical thinking
• You question requirements
• You think about edge cases
• You optimize systems, not just make them “work”
• Be high agency
• You don’t wait for step-by-step instructions
• You proactively propose solutions
• You take ownership of outcomes
• Be able to learn fast on the job

Help will be provided but you will not be spoonfed.

Absolute Requirement (Non-Negotiable)

If you have not built any side projects with a visible output, you will most likely be rejected.

We expect at least one of:

• A deployed web app
• A GitHub repo with meaningful commits
• A working AI tool
• A live demo link
• A product you built and shipped
• An agent, automation, bot, or workflow you created

Bonus Points (Strong Signals)

These are not required but will strongly differentiate you:

• Built projects using:
• LLM APIs (OpenAI, Anthropic, etc.)
• LangChain / LlamaIndex / custom agent frameworks
• Vector DBs like Pinecone, Weaviate, FAISS
• RAG systems
• Experience deploying:
• Vercel, Fly.io, Render, AWS, etc.
• Built internal tools for a team before
• Strong product intuition (you care about UX, not just code)
• Experience automating your own workflows using scripts or AI

What You’ll Gain

You will get:

• Real experience building AI agents used daily
• Ownership over production systems
• Deep exposure to:
• AI architecture
• Product thinking
• Iterative engineering
• Tradeoffs (cost vs latency vs accuracy)
• A portfolio that actually means something in 2026
• A strong shot at long-term roles based on performance

If you perform well, you won’t leave with a certificate, you'll leave with real-world building experience.

Who This Is Perfect For

• People who already build things for fun
• People who automate their own life with scripts/tools
• People who learn by shipping
• People who prefer responsibility over structure
• People who are excited by ambiguity

Who This Is Not For

Be honest with yourself:

• If you need step-by-step instructions
• If you avoid open-ended problems
• If you’ve never built anything outside assignments
• If you dislike using AI tools while coding

This will be frustrating for you.

How To Apply

Send:

• Your GitHub
• Links to projects (deployed preferred)
• A short note explaining:
• What you built
• Why you built it
• What you’d improve if you had more time

Strong portfolios beat strong resumes.

Location: Mumbai

Experience Required: 2+ Years

Job Type: Full-Time

Notice Period: Immediate Joiners

About the Role

We are seeking a skilled and experienced Full Stack (MERN) Developer to join our product engineering team. The ideal candidate must have experience working in a product-based software development company and should have hands-on involvement in e-commerce platform projects.

Mandatory Criteria

• Candidate must be currently working or have prior experience in a product-based software development company
• Candidate must have worked on at least one e-commerce platform project (end-to-end involvement)

Key Responsibilities

• Develop and maintain scalable web applications using MongoDB, Express.js, React.js, and Node.js
• Translate UI/UX designs into high-quality front-end code
• Build and integrate RESTful APIs
• Ensure performance, quality, and responsiveness of applications
• Participate in design discussions, code reviews, and contribute to technical documentation
• Work in a collaborative, agile development environment

Required Skills

• Strong proficiency in JavaScript, React.js, Node.js, and Express.js
• Hands-on experience with MongoDB or other NoSQL databases
• Solid understanding of RESTful APIs and architectural patterns
• Knowledge of version control systems like Git
• Understanding of CI/CD and cloud-based deployment practices
• Good grasp of performance optimization, caching, and security practices

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.

Responsibilities:

• Concepting, creating, and building websites alongside our graphic design team, including taking designer wireframes and magically turning them into effective code.
• Working through the website development lifecycle to launch.
  Designing user-based interactions through an effective front-end architecture framework.
• Developing functional databases, applications, and servers to support our websites on the back end.
• Developing and designing RESTful services and APIs.
• Determining application responsiveness for consumers.
• Troubleshooting issues and problem-solving as necessary.
• Keeping current with industry trends and developments that can be applied to company needs.

Requirements:

• Bachelor’s Degree in Computer Science.
• Expertise with MEAN stack
• Fluent in CSS (Foundation or Bootstrap), JavaScript, and HTML, with an understanding of CSS preprocessors including Sass and LESS.
• Strong knowledge of Linux, JavaScript, and MongoDB with working knowledge of SQL Database and PHP.
• Experience with JS-based tools including Bower, Grunt, and Gulp.
• Working experience as a Full Stack Developer.
• Experience working with server technologies including Apache, ISS, Node.js, and Nginx.
• Experience in API design and development.
• Understanding of libraries including Backbone.js and jQuery.
• Experience with Docker, AWS, CI/CD, Jira is a plus.
• Strong knowledge of data structures, system design, and algorithms.
• Excellent communication skills, with strong attention to detail and a head for problem-solving.
• Skilled at working in tandem with a team, or unsupervised as required.

FULL STACK DEVELOPER

Skills Required:

• The ideal candidate should be hands-on, creative and passionate for new technology in Angular, NodeJS, AWS, MVC and enjoys collaboration, love software programming/coding and carries appetite for learning and sharing knowledge to make an impact on project delivery.
• Experts in multiple technologies such as Modern Java Script framework (preferably Angular 2 and above), Plain old Vanilla Java Script, MVC, jQuery, Web API, Node.JS, AWS, HTML, CSS etc. across software engineering, security, data interchange, data management (No Sql and Relational Database) etc.
• Must have good understanding of TypeScript, Materialized CSS, Sass, Less etc.
• Good to have Task Runners (Grant, Gulp, Webpack), Transpilers like Babel.
• Guide and mentor reporting team and create high performing technology teams.
• Monitor module progress and ensure regular publishing of status report and quality matrices to track the risks work to actively to resolve/mitigate the same.
• Solid understanding of the practical application of agile development methods and leading software development teams in an Agile/Lean/Continuous Delivery environment.
• Solid understanding and experienced of verson control systems like Git, GitHub, BitBucket, SVN etc.
• Should be passionate, voracious continuous learner who keeps up with the latest trends, tools, and technologies in the industry.
• Understands all times, technical depth and client expectation to maintain check on project health, monitors critical path items, risks and impact to timelines.
• Proficient communication/interactive skills

Key Skills:

Angular, MongoDB, Node.JS, MVC Architecture, HTML5, CSS, jQuery.

CTC - 12 to 14 LPA

Experience - 3+ Years

Skills:

• Mandatory experience on Angular 2+
• Hands-on experience on MEAN stack
• Proficient with OOPS and design patterns
• Frontend using Angular 2+/ReactJS/VueJS
• Backend using NodeJS (ExpressJS/SailsJS)/Python/Java
• Good understanding of NoSQL & SQL databases
• HTML, CSS(Knowledge of web semantics, CSS Pre-processors preferable)
• Should be able to translate design to HTML, CSS Git

Good to have:

Mobile app experience using react-native, flutter, etc

AWS/Azure/GCP

Experience:

3+ years

At least one application in production