Javascript Lead

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.

We’re hiring a Full Stack Developer (5+ years, Pune location) to join our growing team!

You’ll be working with React.js, Node.js, JavaScript, APIs, and cloud deployments to build scalable and high-performing web applications.

Responsibilities include developing responsive apps, building RESTful APIs, working with SQL/NoSQL databases, and deploying apps on AWS/Docker.

Experience with CI/CD, Git, secure coding practices (OAuth/JWT), and Agile collaboration is a must.

If you’re passionate about full stack development and want to work on impactful projects, we’d love to connect!

About Seek

We are building a consumer-first rewards platform that brings personalised offers and rewards for every consumer.

This is a very early opportunity, you will be working with the Founding team to build Seek's first product and business from the ground up.

What will I do in this role?

- develop designs into high-perfomance Flutter apps for Android and iOS

- own and be responsible for performance, security and experience on the Seek mobile apps

What's in it for me?

- You'll be one of the earliest members in the team

- Experience how a startup is built in its early days

- Explore and acquire new skills along with building depth in your desired field of work

Required Skills and Interests

- Flutter

- Firebase

- Android/iOS Development

- AWS

- Full-stack experience preferred

YOptima is a well capitalized digital startup pioneering full funnel marketing via programmatic media. YOptima is trusted by leading marketers and agencies in India and is expanding its footprint globally.

We are expanding our tech team and looking for a prolific Staff Engineer to lead our tech team as a leader (without necessarily being a people manager). Our tech is hosted on Google cloud and the stack includes React, Node.js, AirFlow, Python, Cloud SQL, BigQuery, TensorFlow.

If you have hands-on experience and passion for building and running scalable cloud-based platforms that change the lives of the customers globally and drive industry leadership, please read on.

1. You have 6+ years of quality experience in building scalable digital products/platforms with experience in full stack development, big data analytics and Devops.
2. You are great at identifying risks and opportunities, and have the depth that comes with willingness and capability to be hands-on. Do you still code? Do you love to code? Do you love to roll up your sleeves and debug things?
3. Do you enjoy going deep into that part of the 'full stack' that you are not an expert of?

Responsibilities:

• You will help build a platform that supports large scale data, with multi-tenancy and near real-time analytics.
• You will lead and mentor a team of data engineers and full stack engineers to build the next generation data-driven marketing platform and solutions.
• You will lead exploring and building new tech and solutions that solve business problems of today and tomorrow.

Qualifications:

• Bachelor’s or Master’s degree in Computer Science or equivalent discipline.
• Excellent computer systems fundamentals, DS/Algorithms and problem solving skills.
• Experience in conceiving, designing, architecting, developing and operating full stack, data-driven platforms using Big data and cloud tech in GCP/AWS environments.

What you get: Opportunity to build a global company. Amazing learning experience. Transparent work culture. Meaningful equity in the business.

At YOptima, we value people who are driven by a higher sense of responsibility, bias for action, transparency, persistence with adaptability, curiosity and humility. We believe that successful people have more failures than average people have attempts. And that success needs the creative mindset to deal with ambiguities when you start, the courage to handle rejections and failure and rise up, and the persistence and humility to iterate and course correct.

1. We look for people who are initiative driven, and not interruption driven. The ones who challenge the status quo with humility and candor.
2. We believe startup managers and leaders are great individual contributors too, and that there is no place for context free leadership.
3. We believe that the curiosity and persistence to learn new skills and nuances, and to apply the smartness in different contexts matter more than just academic knowledge.

Location:

1. Brookefield, Bangalore
2. Jui Nagar, Navi Mumbai

• A champ in Data Structures, Algorithms, Object-Oriented Design, Analysis, Multi-threading, Design patterns, and other computer science concepts.
• Developing and managing applications for new features and enhancement in full-stack
• A proven technical leader within an Agile development environment
• Experience in delivering full-stack solutions across multiple technologies.
• Able to showcase work involving low latency concurrent and distributed systems/applications.
• Able to multi-task and work in a cross-cultural geographically distributed environment.
• Proactive, self-starter, and hands-on with multiple upcoming technologies.
• Managing our Engineering team - coach them, advocate for them, and productive.
• Providing technical leadership and being accountable for the technical decisions made by your team, with a focus on performance, scalability, privacy, and security.
• Work closely with Product, Design, and Manager to create a meaningful vision and roadmap for the team, towards delivering impactful work and a successful outcome.

This is an excellent opportunity to lead the award winning payment solution team.

Finzly is looking for a Java Lead with 10+ years of experience. The role will be part of a team of offshore engineers to create innovative solutions for our banking customers. This is a leading and hand on software engineering role for those who enjoy working on latest technologies, and are always eager to learn and innovate. A great opportunity to be a part of a growing Fin-tech Product based company and to build up a career in the core banking/payments domain

Skills: Java*.*, Angular, Spring Boot, Spring Batch 

Job Location:Pune/Chennai

*Immediate joiners preferred

What Finzly offers?

• An exciting opportunity to be a part of a growing Fin-tech Product based company.
• An opportunity to learn , be a part of a vibrant team and build up a career in the core banking/payments domain.
• Competitive compensation.
• A result oriented and agile company culture, with a flat hierarchy and zero politics.

What you'll do?

• Responsible for the design and implementation of features for new products and enhancements to existing products.
• Understand, apply and create high-level architectural design and patterns
• Actively guide and challenge intermediate and junior developers
• Writing high quality robust code to meet the desired specification.
• Work seamlessly with the local development and QA team and with other members of our global team.
• Ability to work in a fast-paced Agile environment delivering great quality product..
• 100% Remote working during COVID Pandemic.

What you have to bring ?

• A Bachelors or Masters degree in subjects such as computer science or an equivalent qualification
• Experience in building microservice based applications
• A “can do” attitude with zeal to deliver the best quality product.
• Take ownership and shape the future of our product with your ideas.
• Extensive hands on experience in Core Java, J2EE, Multi-threading, Web Applications.
• Extensive knowledge of Spring Boot and Spring Framework.
• Experience with Messaging Middleware like Kafka, RabbitMQ, IBM MQ
• Experience with Angular and building responsive web applications is a plus.
• Excellent verbal and written communication skills.
• Ability to work in an international multi-site environment in conjunction with remote teams.

About the team:

At Finzly you'll have the opportunity to work on some of the most challenging and relevant issues in financial services and technology. Our talented people empower us, and we believe in being part of a team that is open, collaborative, entrepreneurial, and passionate and above all fun. We require skill in developing modern micro service web applications and restful APIs on Amazon's AWS cloud platform. The role will be part of a team of offshore engineers to create innovative solutions for our banking customers. This is a hand on software engineering role for those who enjoy working on latest technologies, and are always eager to learn and innovate.

Finzly is on a mission to free banks from their core and core-vendor limitations by creating an App store ecosystem which empowers banks to instantly and easily try new products and services. Therefore, enabling them to make smarter technology decisions while going-to-market at fin-tech speed.

Finzly recently won an award “Best enterprise payment solution”

Why we exist:

The Indian internet has exploded. Over half a billion Indians will be online before the end of this year. Most of these Indians will prefer using their own language online. And next to nobody is building solutions for them. They are prevented from using the internet to its fullest potential because English forms a language barrier.

Whenever they visit a site or app, they are met with a wall of text in a language that they do not understand.

We at Reverie believe in language equality on the internet. It’s what drives us and gives what we do meaning. Language equality basically means that every Indian should enjoy the same range of options and experiences online in their own language that an English speaker does online.

 What we do:

We take immense pride in the fact that we tackle some of the most complex and impactful problems Indian language users currently face today.

We’re working towards our mission of language equality by building a full-stack of language technologies and solutions, spanning fonts, font rendering, transliteration, translation, app & website localisation in real-time, Indian language input (check out our Swalekh keypad on the App Store https://play.google.com/store/apps/details?id=com.reverie.swalekh&;hl=en">here), Indian language voice assistants, and Indic search, to empower the Indian language user and let them tap into the possibilities the internet offers them.

 What we DON’T care about:

Your age, gender, where you went to college, or your academic scores.

 What we DO care about:

• Our mission resonates with you
• You have an insatiable curiosity, which means you’ll figure a way out even in an unfamiliar environment.
• And finally your integrity and work ethic

  Lead Developer - Full Stack

Job Description

• A lead developer who will be reponsible for the performance and efficiency of the product.
• Should be having hands on experience in Javascript and web technologies and must be proficient in NodeJS and ReactJS
• Experience with Python, GoLand & Cloud is desirable.
• Must be experienced in building scalable back-end infrastructure software or distributed systems for commercial services with exposure to Front-end and backend libraries/framework

• Responsible for the successful technical delivery of code and design documents
• Responsible to evaluate and review design frameworks and methodologies.
• Responsible for organizing, documenting, and review work items scope from a technical point of view.
• Responsible for scoping, designing, development, reviews, and complete delivery from the technical end.
• Review and validate estimates for complex projects to ensure correct sizing of work.
• Participates in POCs, validates the complex technical solution, performs estimates and collateral consolidation.
• Lead and coach a team of junior developers

Requirement

• Strong experience in the development of microservices-based applications using JEE technologies Spring Boot, and Spring MVC, JPA, and Hibernate.
• Experience in handling integration with multiple legacy systems by creating/consuming services in SOAP/REST/MQ, Apache Camel integration framework.
• Strong experience in developing web applications using single-page architecture and a responsive design using Angular, Bootstrap, and building hybrid mobile applications
• Understanding of front-end technologies, such as HTML5, and CSS3
• Containerizing applications using Docker/Kubernetes
• Setting up CI/CD pipelines using GIT, Jenkins, SonarQube is a plus
• Setting up applications for log monitoring using ELK stack and performance monitoring using Prometheus and Grafana is a plus
• Ensure quality and timeliness of implementation of activities related to design, build and implementation of work product; participate in activities related to requirements elicitation, validation of architecture, creation, and review of design; provide pseudo code to the team; assign and review tasks for work product implementation with the objective of ensuring the highest levels of service offerings in own technology domain
• Performs high and low-level design provides pseudo-codes, implements the prototype, and does design reviews in order to deliver design documents as per customer requirements
• Provides inputs for an overall implementation plan, lead deployment of applications, infrastructure, and post-production support activities
• Interface with customer for issue resolution, provide status updates, Build customer confidence in team`s ability to deliver in order to support high customer satisfaction
• Understand client-side business requirements and provide value-led solutions. Should have strong and clear verbal and written communication skills including addressing escalations, presenting status in management meetings. Excellent client interfacing skills, mentoring skills
• Experienced in developing microservices/APIs using REST principles
• Experienced in JEE technologies, Spring Boot, Spring MVC, Hibernate, Swagger
• Experienced in using Queues (ActiveMQ/RabbitMQ, Kafka) and integration frameworks like Apache Camel
• Experienced in Front End skills include Angular, CSS, SAAS, Node, NPM, Bootstrap
• Experience with one of the application servers like Tomcat, JBoss EAP, IBM WebSphere
• Experience with relational databases like Postgres, Oracle DB2, and NoSQL databases like Elastic Search, MongoDB, Neo4J
• Experience in containerizing applications using Docker/Kubernetes
• Experience in setting up CI/CD pipelines using GIT, Jenkins, SonarQube is a plus
• Experience in setting up applications for log monitoring using ELK stack and performance monitoring using Prometheus and Grafana is a plus

• Work with data science teams ,development teams and product managers to ideate
• software solutions
• Design client-side and server-side architecture
• Build the front-end of applications through appealing visual design
• Develop and manage well-functioning databases and applications
• Write effective APIs
• Test software to ensure responsiveness and efficiency
• Troubleshoot, debug and upgrade software .
• Create security and data protection settings
• Build features and applications with a mobile responsive design
• Write technical documentation
• Work with data scientists and analysts to improve software
• Capable to handle the individual module / Project

• 2-5 years of relevant experience as a Full Stack Developer or similar role
• Experience developing Web based,desktop and mobile applications
• Familiarity with common stacks
• Knowledge of multiple front-end languages and libraries (e.g. HTML/ CSS, JavaScript, XML, jQuery etc).
•  Knowledge of multiple back-end languages (e.g. Java, Python,C#) and JavaScript frameworks (e.g. Angular, React, Node.js)
• Experience in React.js .
• Experience in Python Django Framework .
• Familiarity with databases (e.g. MySQL,Postgresql, MongoDB), web servers (e.g.Apache) and UI/UX design .
• Familiarity with Cloud services like AWS, GCP.
• Excellent communication and teamwork skills
• Great attention to detail
• Organizational skills
• An analytical mind