Node JS

About ZYSYGY

ZYSYGY is building Germany's zero-fee payment network. Merchants pay zero transaction fees. We route payments directly over SEPA Instant, bypassing Visa, Mastercard, and the entire card network chain. No hardware. No card reader. Just a phone.

We are building the first company to combine a fully software-based merchant POS with a consumer super-app for everyday financial life: payments, transport, utilities, government services, all in one place. Think what UPI did for India. We are doing it for Germany, from the ground up, on banking rails.

Role Overview

You will join the core engineering team as a founding engineer. You will own the backend payment engine end to end: transaction flows, wallet management, SEPA Instant settlement, KYB/KYC integration, recurring mandates, refund logic, and the compliance export layer (DATEV, Kassenbuch, GoBD, fiskaltrust). On mobile, you will contribute to the React Native consumer and merchant apps alongside our mobile engineer.

You will own what you build from development through deployment, monitoring, and production reliability. The architecture decisions you make in the first six months will run in production for years.

What you will do

Design and build the backend payment engine: transaction flows, wallet management, SEPA Instant settlement, offline payment authorization, and recurring mandate billing.

Own KYB/KYC integration and the compliance export layer: DATEV, Kassenbuch, GoBD, and fiskaltrust for KassenSichV.

Build REST APIs for financial-grade reliability and high-throughput transaction processing, including full R-transaction handling and reconciliation pipelines.

Contribute to the React Native consumer and merchant mobile apps alongside our mobile engineer.

Own the full lifecycle of what you build, from development through deployment, monitoring, and continuous improvement.

Integrate AI tooling into your development workflow as a matter of course: code generation, automated testing, and intelligent review.

Who you are

Meaningful hands-on experience building payment systems, fintech infrastructure, or financial APIs.

You have designed a ledger. You understand double-entry bookkeeping, immutable transaction records, and why you never update a financial row.

You have solved the partial failure. Money left one wallet and did not arrive in the other. You know how to detect it, resolve it, and make sure it does not happen again.

You understand idempotency at a design level. You have built systems that survive client retries, duplicate webhooks, and network drops without double-charging anyone.

You have built or reasoned about reconciliation: detecting discrepancies between your internal ledger and an external settlement file, and resolving them reliably at scale.

You understand KYC and KYB state machines, what happens when verification status changes mid-transaction, and what a regulator expects from your audit trail.

You are comfortable with SQL databases and own the full lifecycle of your code from development through deployment.

You can communicate technical decisions clearly to non-technical stakeholders. At this stage of the company, that matters.

You are a continuous learner. Payments infrastructure is a deep domain and you treat it that way.

You are comfortable with ambiguity and early-stage risk. There is no playbook yet. You will help write it.

Strong academic background preferred. Demonstrated engineering ability matters more than institution.

Relocation

Relocation to Munich, Germany, is on the table for the right candidate, including visa support.

Connect with the Founder

You can also connect with me on LinkedIn at www.linkedin.com/in/shabbir-maimoon

Role : Nodejs developer

Please find below the JD for the Nodejs developer..

 Role: NodeJs Developer 

We are looking for a Node.js Developer responsible for managing the interchange of data between the server and the users. Your primary focus will be the development of all server-side logic, definition and maintenance of the central database, and ensuring high performance and responsiveness to requests from the front-end. A basic understanding of front-end technologies is necessary as well. Responsibilities

 • Collaborate with other members of the team, such as front-end developers

 • Writing reusable, testable, and efficient code 

• Design and implementation of low-latency, high-availability, and performant applications 

• Implementation of security and data protection

 • Integration of data storage solutions • Writing unit test cases • Documenting application changes and developing updates. 

Skills 

• Strong proficiency with JavaScript 

• Experience of Node.js and frameworks available such as Express

 • Practical experience with REST, PostgreSQL, WebSocket, MongoDB, Redis. 

• Understanding the nature of asynchronous programming and its quirks and workarounds 

• User authentication and authorization between multiple systems, servers, and environments 

• Integration of multiple data sources and databases into one system 

• Understanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platform • Creating database schemas that represent and support business processes

 • Implementing automated testing platforms and unit tests

 • Proficient understanding of code versioning tools, such as Git

 • Good understanding of front-end technologies, such as HTML5, and CSS3  

• Key Skills:
• Expert Proficiency in anyone the below programming language - Node JS, PHP or GoLang
• Expert Computer Science fundamentals like Data Structures, Algorithms, Time Complexity, and others
• Strong Microservices, REST API, Git source control, CI/CD, and other latest technology trends
• Strong System Design, DB Design proficiency
• Strong knowledge in Design Patterns, best software development practices
• Good exposure to working in Open Source stack, E-Commerce, or Fintech domain.

About the Company:

Alyke, recognized as India's first friendship app, is revolutionizing the way people find friends online through its innovative matching algorithm. Alyke has quickly gained traction, surpassing 1 million users. This platform uniquely connects individuals based on shared interests and proximity, and stands out for its commitment to creating a secure environment that encourages users to express themselves freely. Joining Alyke offers the chance to be part of an innovative team dedicated to reshaping the landscape of social connections

Role Overview:

As a Senior Backend Developer, you will play a crucial role in the design, development, and optimization of our backend systems. You will be instrumental in building scalable, high-performance applications that support our business's needs. This role demands a deep understanding of backend technologies, database design, cloud infrastructure, and the ability to integrate a wide range of services and APIs.

Key Responsibilities

• Design and implement scalable, secure, and robust backend services and APIs.
• Lead the development of microservices architecture, ensuring optimal performance and scalability.
• Oversee the integration of third-party services and external APIs, including notification services like FCM.
• Develop and manage database schemas, optimizing for performance and scalability using MongoDB and Redis.
• Implement real-time data processing mechanisms for live updates and push notifications, utilizing technologies like Firebase.
• Manage cloud infrastructure and serverless functions on platforms such as AWS and GCP, ensuring efficient operations and cost management.
• Ensure the security of backend systems through robust authentication, authorization, data encryption, and adherence to best practices in data security and compliance.
• Work closely with the frontend team to integrate backend services and ensure a seamless user experience.
• Continuously evaluate and adopt new technologies and frameworks to improve the backend infrastructure.
• Mentor junior developers, fostering a culture of learning and growth within the team.

Qualifications

• Bachelor’s degree in Computer Science, Engineering, or a related field.
• 5+ years of experience in backend development, with a strong portfolio of projects demonstrating expertise in NodeJS, ExpressJS, and asynchronous programming.
• Extensive experience with database design, optimization, and management using MongoDB and Redis.
• Proven track record in developing and managing REST APIs.
• Deep understanding of microservices architecture and real-time data processing.
• Solid experience with caching mechanisms and SQS management.
• Comprehensive knowledge of security principles, including authentication, authorization, and data encryption.
• Familiarity with compliance and data protection standards.
• Should have worked on scalable microservices architecture
• Experience with Lambda functions.
• Experience working with firebase
• Should have proven experience in mobile application development
• Should have working experience in sqs
• Have knowledge of elastic cache 
• Experience with cloud-native development and managing cloud infrastructure on AWS or GCP.
• Excellent problem-solving skills, with the ability to lead projects and collaborate effectively with cross-functional teams.
• Strong communication and leadership skills, with a passion for mentoring and driving technical excellence.
• Attach the link of mobile application worked on till date

Why Join Us?

• Opportunity to lead a cutting-edge project impacting users globally.
• Work in an environment that fosters innovation, collaboration, and professional growth.
• Competitive compensation, comprehensive benefits.

We are hiring IN OFFICE ONLY.

Office located in the beautiful Astra Towers in Rajarhat Kolkata.

We are looking for Senior Laravel Developers that have experience with Laravel Framework PHP, and VueJs.

You will be working right away with other senior Laravel Developers that know the products. You will be learning the projects, and helping them clean up and polish our tech better. We are a product based company.

A little about us:

Klizo Solutions has over 50 employees and is located in the New Town area, near CC2. Our employees range from graphic designers, back-end developers, iOS and Android Developers, and more. We are primarily a product-focused company. Our founder is from the USA and spends about 6 months a year here going back and forth. We develop technologies around his products and develop products for a few other clients. We are looking to expand to more locations, and are hiring for those reasons. You can see a company video here: https://klizos.com/about-us/

Preferred & Required knowledge and Duties:

• MVC Structure
• SQL concept
• Eloquent Relationships
• HTTP middleware
• Basic knowledge of JQuery
• Basic command of Laravel (How to create Model, Controller, migration, middleware )
• Experience of Vue.js
• Experience with Git
• Experience integrating third-party APIs
• Experience with payment APIs

Required Shifts:

We are expected to work Monday - Friday

We may rarely be needed on a Saturday if a project is required.

BONUS Knowledge (not required):

• MongoDB
• Worked with Jira
• Knows Github / Repo / Source control
• Worked with Bitbucket

Job Types: Full-time, Permanent, In Office

Benefits

• Bonuses based on performance
• Additional training will be available and may be required
• Clean office, professional hardware, and a positive team.

We are looking to hire Node.js Backend developers to build a consumer-friendly social commerce app.

You can apply if you have knowledge of JavaScript and frameworks/systems (nodejs) and

• Strong analytical skills and aptitude Good Understanding of architecture, software design and best coding practices
• Ability to learn new languages and technologies
• Experience with databases (both SQL and NoSQL)
• Familiarity with Agile development methodologies
• Good working knowledge of Linux
• Excellent communication skills

Plus points:

• Knowledge of Redis, Mongo and Mysql.
• Knowledge of AWS services.
• Knowledge of CI/CD pipelines.
• Deep understanding of Database Indexing.
• Knowledge of microservices architecture.
• Knowledge of golang/rust.

Working with an early stage startup can get you an opportunity to build systems from scratch, exponentially grow your career and become industry leaders. You will be working with experienced software engineers from top IITs, unicorns and soonicorns who have built systems for millions of users

Job Description
We are looking for a Back-End Web Developer responsible for managing the interchange of data between the server and the users. Your primary focus will be development of all server-side logic, definition and maintenance of the central database, and ensuring high performance and responsiveness to requests from the front-end.

Responsibilities

• Integration of user-facing elements developed by a front-end developers with server side logic
• Building reusable code and libraries for future use
• Optimization of the application for maximum speed and scalability
• Implementation of security and data protection
  
  

Skills And Qualifications

• Basic understanding of front-end technologies and platforms, such as JavaScript, HTML5, and CSS3
• User authentication and authorization between multiple systems, servers, and environments
• Integration of multiple data sources and databases into one system
• Management of hosting environment, including database administration and scaling an application to support load changes
• Data migration, transformation, and scripting
• Setup and administration of backups
• Creating database schemas that represent and support business processes
• Implementing automated testing platforms and unit tests
• Experience with Kafka / RabbitMQ
• Proficient knowledge of NodeJS
• Working knowledge of databases like PostgreSQL and MongoDB
• Experience with AWS Cloud services like S3 and EC2
• Proficient understanding of code versioning tools, such as Git

1. Interfacing with the customer, tech team members, project managers and other relevant product people for a thorough understanding of the product, use case and business objective, detailed specification and data flow for the requirement, demonstration of the solution and clarification of queries at appropriate times during the life-cycle of the product
2. Preparing test cases, setting up CI/CD and integration with logging and monitoring systems for the products or platforms by the end of 6 months
3. Seeking customer feedback to continuously optimize the product for great customer experience and high technical performance in areas such as hardware efficiency, latency and throughput
4. Delivering a robust backend platform for the products and platforms by incorporating important considerations regarding minimal downtime, high availability, data redundancy, tight security, etc. into the design

Analytical and Problem Solving Skills

• Has high grasping power. Able to quickly and proficiently understand and absorb qualitative or quantitative data and draw insightful conclusions from it. Exhibits a probing mind and achieves penetrating insights. Attention to detail. Does not let important details slip through the cracks and derail a project. Generates new and innovative approaches to problems.

Efficiency and Execution

• Able to produce significant output with minimal wasted effort in a timely manner. Focuses on key priorities.

Hard Work and Persistence

• Possesses a strong willingness to work hard and sometimes long hours to get the job done.
• Demonstrates determination and willingness to go the distance to get something done.

Flexibility and Adaptability

• Adjusts quickly to changing priorities and conditions. Copes effectively with complexity and change. Demonstrates ability to learn new things.

Calm under Pressure

• Maintains stable performance when under heavy pressure or stress.

Team Player

• Reaches out to peers and cooperates with supervisors to establish an overall collaborative working relationship. Works proactively without always being told what to do.