Sr. Full-Stack Developer – MERN Stack + Python

Experienced Senior Full Stack Engineer to Build & Backend for Event Ticketing Platform Using Claude Code

Overview

We have the frontend already built in Replit for both user and admin experiences. We are looking for a very experienced software engineer to design, build, and scale a production ready backend for a high concurrency event ticketing platform.

This role is for a true senior engineer who actively uses Claude Code as part of their daily development workflow, understands how to review and harden AI assisted output, and can ship systems that hold up under real world load, QA, and security testing.

This is not a prototype or demo system. This backend must be reliable, scalable, secure, and extremely well documented.

What You Will Be Building

• Backend services for an event ticketing platform

• Multi tenant architecture supporting thousands of organizers and events

• High concurrency purchase and checkout flows

• Secure user, admin, and system level access controls

• Production deployments with secrets management, middleware, and security layers

• Observability, logging, and metrics suitable for QA and load testing

• A thoroughly documented backend that future engineers can onboard into quickly

Core Engineering Requirements

• 10 plus years of professional software engineering experience

• Expert level experience using Claude Code or equivalent AI coding agents in real production workflows

• Deep experience building backends with Node.js

• Strong experience with Supabase and PostgreSQL

• Experience deploying and scaling applications on Vercel

• Proven experience extending existing codebases safely

• Strong API design and database performance fundamentals

• Ability to reason clearly about concurrency, transactions, and failure modes

Scalability and Performance Expectations

The backend must be designed to support:

• Hundreds of thousands of ticket purchases

• Thousands of concurrent users and tenants

• Large traffic spikes during on sale windows

• Load testing across all major latency percentiles including p90, p95, and p99

• Extremely low tail latency under high concurrency

• Graceful degradation and recovery under stress

You should be comfortable designing and implementing caching strategies, queue based workflows, idempotent operations, locking mechanisms, and transactional safety.

Security and Production Readiness

You must be able to:

• Set up production environments with proper secrets management

• Implement middleware for authentication, authorization, and rate limiting

• Design secure communication between frontend and backend

• Apply industry best practices for security hardening

• Prepare the system to pass penetration testing

• Maintain clean separation of concerns and least privilege access

Documentation and Developer Experience Requirements

High quality documentation is a hard requirement for this role.

You must have experience:

• Using AI powered documentation tools to generate and maintain technical documentation

• Producing clear architectural overviews and system diagrams

• Writing detailed README files and onboarding guides

• Documenting APIs, data models, and critical flows

• Keeping documentation in sync with code changes over time

We expect the backend to be easy to understand, easy to extend, and well explained for future engineers.

How We Evaluate Candidates

We are looking for engineers who can demonstrate:

• Real production systems they have built or scaled

• Clear judgment in how they use Claude Code and validate AI generated output

• Strong opinions on production readiness backed by experience

• The ability to move fast without sacrificing quality or safety

A short paid technical task may be used that involves real backend work with production quality code and documentation.

About Company:

HealthAsyst® is an IT service and product company. It is a leading provider of IT services to some of the largest healthcare IT vendors in the United States. We bring the value of cutting-edge technology through our deep expertise in product engineering, custom software development, testing, large scale healthcare IT implementation and integrations, on-going maintenance and support, BI & Analytics, and remote monitoring platforms.

As a true partner, we help our customers navigate a complex regulatory landscape, deal with cost pressures, and offer high-quality services. As a healthcare transformation agent, we enable innovation in technology and accelerate problem-solving while delivering unmatched cost benefits to healthcare technology companies.

Founded : 1999

Location : Anjaneya Techno Park, HAL Old Airport Road, Bangalore. Products : CheckinAsyst, RadAsyst

IT Services : Product Engineering, Custom Development, QA & Testing, Integration, Maintenance, Managed Services.

Position Overview:

We are seeking a highly skilled and motivated Associate Architect for Web Applications to join our dynamic product development team. The ideal candidate will have a strong background in web application architecture, design, and development, along with a passion for staying up to date with the latest industry trends and technologies. As an Associate Architect, you will collaborate with cross-functional teams, mentor junior developers, and play a critical role in shaping the technical direction of our web applications

Qualifications:

• Bachelor’s or master’s degree in computer science, Software Engineering, or a related field.
• 3-6 years experience 
• Proven experience in designing and developing web applications using modern web technologies and frameworks (e.g., JavaScript, React, jQuery Mobile, MVC and ASP.net
• Proficiency in database design  
• Excellent problem-solving skills and the ability to tackle complex technical challenges.
• Familiarity with cloud platforms (Azure) and containerization technologies (Docker) is a plus.
• Effective communication skills and the ability to collaborate with both technical and non-technical stakeholders.
• Up-to-date knowledge of industry trends, emerging technologies, and best practices in web application development.

Key Responsibilities:

Development and Coding:

• Participate in hands-on development of components and features, ensuring code quality, performance, and security.
• Collaborate with front-end and back-end developers. With full stack development experience, ensure integrations are done well within the technical stack and partner systems.
• Troubleshoot complex technical issues, provide workaround, and contribute to debugging efforts.

Performance and Scalability:

• Optimize application performance by analysing and addressing bottlenecks, ensuring responsive and efficient user experiences.
• Design and implement strategies for horizontal and vertical scalability to support increasing user loads and data volumes.

Collaboration and Communication:

• Work closely with cross-functional teams, including Architects, QA engineers, Business analyst, automation resource to deliver features on time.
• Effectively communicate technical concepts to non-technical stakeholders, contributing to project planning, progress tracking, and decision-making.

Job description

We are looking for MERN Stack Interns to join our team and help us build and maintain high-performance web applications. As a MERN stack developer, you will be responsible for designing, developing, and deploying web applications using the MERN stack (MongoDB, Express, React, and Node.js).

Key Responsibilities:

• Design and develop web applications using the MERN stack
• Write clean, maintainable, and efficient code
• Collaborate with the team to define, design, and ship new features
• Troubleshoot, debug, and optimize the application
• Stay up-to-date with the latest industry trends and technologies
• Participate in code reviews and ensure the code is maintainable and scalable

Qualifications:

• Strong knowledge of JavaScript.
• Familiar with MongoDB, Express, React, and Node.js
• Familiar with web development concepts such as RESTful API design, authentication and authorization, and front-end optimization.
• Familiar with Git, webpack, and other development tools.
• Strong problem-solving skills and ability to debug and optimize code.
• Strong communication and documentation skills.
• Must have a bachelor's/master's degree in Computer Science.

If you are passionate about using the latest technologies to build high-performance web applications, we would love to hear from you!

Internship Duration: 06 Months.

Working Days: (Monday to Friday)

Timing: 9:30 AM to 6:30 PM

Job Location: Naini Prayagraj.

Note: This Job is the total based on Work from the Office & We prefer only UP candidates.

Job Types: Full-time, Internship

Salary: ₹5,000.00 per month

Summary:

The Learner Company is an education start-up that designs personalized learning experiences by integrating them with the best of what technology offers. We are currently building an online learning engine to host adaptive online courses, simulations, and multiplayer games for institutional partners. We are now in the software development stage of the project.

We are looking for a full-stack developer to join our development team. The developer will be responsible for the overall development and implementation of front and back-end software applications. Their responsibilities will extend from designing system architecture to high-level programming, performance testing, and systems integration.

We are looking for an individual who is optimistic about technology and people, is open to and excited by new ideas, and considers themselves a life-long learner.

Responsibilities:

• Meeting with the software development team to define the scope and scale of software projects.
• Designing software system architecture.
• Completing data structures and design patterns.
• Designing and implementing scalable web services, applications, and APIs.
• Developing and maintaining internal software tools.
• Writing low-level and high-level code.
• Troubleshooting and bug fixing.
• Identifying bottlenecks and improving software efficiency.
• Collaborating with the design team on developing micro-services.
• Writing technical documents.

Required Competencies:

• Bachelor’s degree in computer engineering or computer science.
• Previous experience as a full stack engineer.
• Advanced knowledge of front-end languages including HTML5, CSS, TypeScript, JavaScript, C++, JQuery, React.js and Next.js.
• Knowledge of relational database systems and SQL.
• Familiarity with AWS architecture and working knowledge of services like S3, SES, EC2, RDS and more.
• Proficient in back-end languages including Java, Python, Rails, Ruby, .NET, and PHP.
• Advanced troubleshooting skills.
• Familiarity with MS Word, Excel, PowerPoint, Notion, Veed.io, Linear, Intercom, Plateau, and Miro.
• A strong belief that a team as a whole is greater than the sum of its parts.
• Excellent leadership, communication, and organization skills
  
  

Experience Needed: 2+ Years

Location: Bengaluru

• Meeting with the software development team to define the scope and scale of software projects.
• Designing software system architecture.
• Completing data structures and design patterns.
• Designing and implementing scalable web services, applications, and APIs.
• Developing and maintaining internal software tools.
• Writing low-level and high-level code.
• Troubleshooting and bug fixing.
• Identifying bottlenecks and improving software efficiency.
• Collaborating with the design team on developing micro-services.
• Writing technical documents.

At CEDCOSS, we're all about you.

CEDCOSS is more about experiencing than talking. It was founded and is still standing on the principle of putting employees first. Discover, create, learn, explore, and be amazed daily. As a team of like-minded individuals with different beliefs, our company is dynamic.

Established in 2010, we have implemented hundreds of eCommerce sites across a variety of platforms. A particular focus is on eCommerce startups and mid-market companies. Our clients range from Fortune 500 companies as well as small businesses.

Are you ready to create connections that become lasting relationships?

Listen, Learn and Make a Match with CEDCOSS!

You should have

● 5 - 8 years of professional experience in Node.js

● Strong Knowledge of Node.js and frameworks - Express.js

● Hands-on experience in creating, designing and using RESTful API

● Experience in the development of large-scale SaaS and cloud-native applications

● 5 years of professional experience building Node.js backend applications

● Proficient in any databases such as MySQL, MongoDB, etc.

● Hands-on Experience in Test Drive Development (TDD)

● Strong knowledge of JavaScript libraries and frameworks such as ReactJS

● Understanding of Agile methodologies and experience working in sprints

● Ability to understand business requirements and translate them into technical requirements

● Knowledge of E–Commerce Integration is Good to have.

● Experience in AWS, CI/CD tools, SVN, Git and Bitbucket is good to have.

What you will Do

● Developing high-performance applications by writing testable, reusable, and efficient code.

● Implementing effective security protocols, data protection measures, and storage solutions.

● Troubleshooting and resolution of technical problems and issues, on web applications in a production environment.

● Ensuring that best practices are followed in the design, development, coding, testing, and debugging of software.

● Developing and maintaining eCommerce platforms/web applications and existing online selling channels and affiliates.

● Previous Experience or relevant exposure in the E-commerce industry and understanding of e-commerce business model.

● Overall Understanding of web development lifecycle including frontend and backend using modern frameworks.

● Strong understanding of data structures, DB schemas, troubleshooting and DB optimization.

● You will have to collaborate with Product Management and Implementation teams and build a commercially successful product

Here's what we believe in

● Empathy, addressing the ability to be humane.

● Humility brings us, future leaders.

● Organizational Ethics demonstrates expertise on subject matters with on-job experience.

● Quality of Work ensuring to deploy and deliver of exceptional outcomes

● Attention to details

● Multitasking capabilities to meet set deadlines and schedules

What benefits can we offer?

● Bi-Yearly performance audits and appraisals

● The flexibility of working days/hours

● Recognition and Appreciation

● A plethora of industry exposure and self-growth opportunities

Become part of a team that thrives on challenging, rewarding, safe, and safe work environments

• Bachelor’s degree in Computer Science, Information Technology, or a similar field.
• Previous experience working as a React.js Developer.(2-8 years)
• In-depth knowledge of JavaScript, CSS, HTML, and front-end languages.
• Knowledge of REACT tools including React.js, Webpack, Enzyme, Redux, and Flux.
• Experience with user interface design.
• Knowledge of performance testing frameworks including Mocha and Jest.
• Experience with browser-based debugging and performance testing software.
• should have hands-on experience in backend software development using Java.
• should have proven expertise in Spring Boot REST/Microservices.
• should have working experience with relational and NoSQL databases.