Fullstack Developer (.Net+React)

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.

Full Stack Engineer

About ZenTrades:

ZenTrades is a rapidly growing product startup that has established a strong foundation in the realm of SaaS (Software as a Service) business solutions, particularly in the Field Service Management software domain. Our vision is to revolutionize the trade services industry by seamlessly integrating technology, streamlining operations, enhancing customer experiences, and driving growth.

Position Overview :

We are actively seeking a seasoned Full Stack Developer proficient in React and Node to contribute to our cutting-edge projects. As a key member of our development team, you will be instrumental in shaping the user experience and functionality of our web applications. If you are a creative thinker with a strong technical foundation and a passion for crafting exceptional user interfaces, we want to hear from you.

Key Responsibilities:

Architect and Develop: Lead the design and development of robust and scalable user interfaces using React frameworks, ensuring the seamless integration of frontend components.

Code Excellence: Exhibit mastery in JavaScript and ES6+, producing code that is not only functional but also adheres to best practices, industry standards, and code quality benchmarks.

State-of-the-Art State Management: Implement advanced state management solutions using Redux or Mobx, optimizing application state for performance and maintainability.

API Integration: Demonstrate expertise in handling asynchronous operations by effectively working with RESTful APIs and manipulating data to enhance overall application responsiveness.

Responsive Design: Utilize a deep understanding of HTML5 and CSS3 to create visually stunning and responsive user interfaces that provide an exceptional user experience across devices.

Optimized Build Processes: Employ front-end build tools, including Webpack and Babel, to streamline development workflows and ensure efficient bundling, transpilation, and optimization of code.

Problem Solving: Exhibit excellent problem-solving skills, tackling complex technical challenges with a systematic and innovative approach.

Quality Commitment: Uphold a commitment to delivering high-quality code with meticulous attention to detail, ensuring the success of our projects through excellence in execution.

Qualifications:

• Proven track record as a Full Stack Developer
• Impeccable attention to detail and a relentless commitment to delivering high-quality code.
• Exceptional problem-solving abilities.
• Should know the microservice architecture and on a need basis should have the ability to automate certain workflows or tasks
• Mastery in any one of the languages - Javascript, Java, Golang, Python3 (preferably deep understanding of JavaScript).
• Should have hands-on experience in AngularJS or React.
• Should have a good understanding of relational and non-relational databases. Knowledge of MySQL and MongoDB is preferred
• Demonstrated experience with RESTful APIs and asynchronous request handling.
• Good knowledge of HTML5 and CSS3.
• Proficiency in front-end build tools, like Webpack/Babel.
• Proficiency with Backend servers
• DevOps experience with AWS and knowledge of ElasticSearch/Solr is a plus
• Descent knowledge of version control systems, especially Git.
• Familiarity with testing frameworks, such as Jest and Enzyme.

If you are a passionate and experienced Full Stack Developer looking to make a significant impact in a dynamic environment, we invite you to apply and be a driving force in our innovative projects.

Responsibilities:

• Collaborate with cross-functional teams to define, design, and ship new features.
• Develop and maintain web applications using Angular and C# .NET.
• Design, build, and maintain efficient, reusable, and reliable code.
• Ensure the best possible performance, quality, and responsiveness of the application.
• Identify and correct bottlenecks and fix bugs.
• Work with external data sources and APIs.
• Unit-test code for robustness, including edge cases, usability, and general reliability.
• Collaborate with other developers and stakeholders to ensure successful project completion.

Requirements:

• Bachelor's degree in Computer Science, Software Engineering, or related field.
• 2+ years of experience in web application development using Angular and C# .NET.
• Strong knowledge of Angular 2+ and TypeScript.
• Experience with Angular Material and Bootstrap.
• Experience with C# .NET and .NET framework.
• Knowledge of relational database design and development using SQL Server.
• Familiarity with agile development methodologies.
• Strong analytical and problem-solving skills.
• Excellent written and verbal communication skills.
• Ability to work independently and as part of a team.

Preferred Qualifications:

• Experience with ASP.NET Core.
• Experience with Entity Framework Core.
• Experience with Azure Cloud Services.
• Familiarity with unit testing frameworks such as NUnit and xUnit.
• Experience with source control management tools such as Git.
• Knowledge of CI/CD pipelines using Azure DevOps or similar tools.

you should be good in react node and javascript and able to build projects on the same. 

You will be the part of India Accelerator tech team, the best startup Accelerator of india. Great learning and growth opportunity

Full-stack developer  - Remote position

Are you...

• Interested in working at a successful, well-funded start-up where every team member can make a huge contribution?
• Keen to make software that people will use every single day to make their lives easier?
• Excited to work on greenfield projects with responsibility and independence?
• Ready to develop and use your skills across our frontend, backend and mobile offerings?
• Meticulous about quality, and gifted with a strong desire to write beautiful code?

About the company

KeyNest solves the key exchange problem for Airbnb users. Our worldwide network of over 4,000 shops store keys so that Airbnb guests / cleaners / contractors can pick them up whenever is convenient for them. As a global partner of Airbnb we’ve checked-in over 2 million guests.

Why we need you

As the entire Airbnb ecosystem increasingly relies on KeyNest, our customers expect us to integrate additional features without reducing the ease of use that our customers love. This is why we continue to invest in beautiful, intuitive user interfaces that integrate with every tool and are used by our customers, their guests and staff, as well as our own staff.

Our product team is lead by one of the founders and complete with a director of engineering, product manager, UX designer, one mobile developer and one senior full-stack developer who will be mentoring you. We want to work with a developer who cares about the way their code impacts the people who use it.

With a genuine passion for high quality work, attention to detail and readiness to own your own projects, you will be looking for a new and exciting challenge which allows you to use your experience to drive change and maintain the high standards of our organisation.

Our Tech Stack

• C# MVC modern tech stack
• Front end web in TypeScript & Angular or Node & React
• Test Driven Development (TDD) and follow SOLID design principles.
• EF 6.0
• SQL Server 2017
• Agile experience (Scrum, Kanban)
• TFS
• Cloud hosted in Azure with micro-services architecture

Your qualities

• 2-4 years experience in C#
• Front-end web experience in Angular
• Track record of building great products
• Excited about understanding the real problems working people come up against and fixing them with technology
• You’ll love the idea of being a big part of a small team: if you come up with a great idea, you can take it all the way to production
• Motivation and ambition to succeed in a fast-paced environment
• Not afraid to take on responsibilities

What we offer

• Crucial role in a funded, dynamic & fast-growing start-up shaking up the sharing economy
• Competitive salary based on relevant experience
• Flexible working for our most committed staff
• Unparalleled opportunities to develop your career as the company develops rapidly

If you want to join the KeyNest team, please get in touch – we look forward to meeting you.

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

• Design and construction of platform with the best possible encryption and security mechanisms
• Compare different design options and take technology-driven design decision
• Define Data model/Information model
• Define services and convert functional requirements to design
• Define APIs and implement them
• Build front end based on user experience design
• Test and Debug as required
• Write Technical Documentation
• Optimize code and design for Performance
• Design and implementation of continuous integration and deployment pipelines

Expected Qualifications and Key Skills

• Working experience in Spring, Spring-boot or equivalent, Hibernate or equivalent persistence framework.
• Working experience of No SQL databases such as MongoDB or equivalent
• Working experience of setting up Production environment including SSL certificates, logging, backup, archival, etc.
• Working experience of JavaScript frameworks such as React JS, JQuery, etc.
• Working experience of API gateways and Web services such as REST
• Working experience of using GIT
• Working experience of a dev-ops tool such as Jenkins
• Deployment experience on Azure/AWS
• Microservices design and development
• Excellent understanding of Data Structures and Algorithms
• Understanding of OOP and Design Patterns
• Works well in a team setting
• Can multitask, adapt to shifting priorities, detail-oriented
• Good work ethic, including a sense of individual responsibility
• Comfortable working on changing requirements in a growing company
• Must be analytical, flexible, innovative, and self-motivated
• Experience with payment platforms and processors would be a plus

• Someone’s traveling to airport/office/home - can we suggest them public transport routes with first mile & last mile and accurate tracking of the individual leg of the journey
• Someone’s new in the city - can we help them travel from A to B in the most efficient way
• Someone’s planning to not use their private vehicle for the commute - can we design an efficient and reliable system to plan their commute with accurate information of public and private transport
• Transition people from private to hybrid multimodal commute
• Someone's traveling home late at night - can we give their friends, family peace of mind?
• Build a single mobile ticket for the entire journey

What you’ll do

• Build the backend and deploy systems powering the app
• Improve routing across 10+ cities for everything from walking to trains to electric scooters to metro to bus to auto to bike
• Integrate new private transport companies and new ways of getting about our cities
• Develop smarter ways of integrating the payment systems with the app
• Extract, process and crunch together departure times, travel habits, and pricing information and suggest reliable results to users
• Create experiences that delight your friends, family, and millions of new commuters when they come and visit your city
• Design and build systems that scale on demand and are secure
• Deploy and support your code on AWS
• Best practices: code reviews, tests, CI
• Teach us how to be better our Stack (Required) Java (Spring Boot), Postgres, MongoDB, ReactJs, Golang Microservice Nginx, API Gateway, Load Balancer, Kafka, Redis, Websockets, Docker, Kubernetes, Git, AWS - EC2, RDS, s3, lambda Optional Nodejs(Express)

Greetings from SMARK Info Solutions!!

We are writing to you from SMARK Info Solutions we are a young company with a technically capable, entrepreneurial, and sophisticated team.

We are reaching out to you for Full-stack Senior Software Engineer (SSE) opportunity with one of our client here in Hyderabad.

The Role

The Full-stack Senior Software Engineer (SSE) in this role will support development and design teams to build scalable web applications and products.

Responsibilities include (but are not limited to):

Support delivery of software components including design and writing/reviewing code

Work within and across Agile to design, develop, test, and implement technical solutions across a full-stack of development tools and technologies

The Candidate

The ideal Full-stack Senior Software Engineer has strong coding skills, has a solid design aesthetic and is determined to create great user experiences.

Key Requirements and Qualifications:

• 3-9 years of professional experience with designing, implementing, deploying, and maintaining front end web applications and related backend services
• Must have worked on Java Spring & Hibernate Framework with strong experience in JavaScript/ Angular-JS, Core Java, J2EE and other related technologies
• Knowledge of Web Service implementation (Restful and SOAP)
• Hands on experience in OOAD and Design Patterns
• Knowledge of Data Structures and Algorithm
• Front-end experience with Angular, JavaScript, HTML, CSS, JQuery, Type Script, ES6
• Experience in JS frameworks (Angular/AngularJS,) and willingness/ability to learn new frameworks if required
• Knowledge of professional software engineering practices and best practices
• Strong communication, organization and project management skills.