11+ System integration testing Jobs in Delhi, NCR and Gurgaon | System integration testing Job openings in Delhi, NCR and Gurgaon

• Hands-on expertise in managing technical teams and work closely with business stakeholders
• Should be familiar with card testing and POS ecosystem.
• Experience with designing APIs and building platform integrations in Commerce, POS, FinTech and Payments
• Payment’s domain experience.
• Extensive experience on Base24 & SWITCH part for payment format.
• Exposure on ISO8583 Messaging system.
• API understanding and creation.
• Working knowledge on cryptographic algorithms (RSA, EC, AES, SHA variants), TLS/SSL protocols. C Symetric and A symetrics, K.M.S.
• Digital Payments technical knowledge - QR/ POS/ UPI/ BQR
• Understanding of CI/CD pipelines, Kubernetes, containerization, Docker
• Must have strong technical skills in Android APK and iOS development Concept and Web services.
• Supportability, monitoring, ops in general.
• Accurate cost models to deploy and operate
• Extensive experience in TLOG’s, data integration with downstream applications, and impact of POS changes on different financial, legal, compliance, loss prevention, etc. applications.
• Extensive experience with payment systems 7861 (EMV, payment middleware, encryption, tokenization, settlement, offline scenarios,).
• Extensive experience with different types of payment methods including credit, debit, gift cards (Both closed loop and open loop), PLCC, PayPal, AliPay, checks, etc. as well as different payment form factors like Tap N Go, contactless, swipe, EMV, Mobile, etc.
• Extensive experience with payment devices (pin pads, printers, registers, scanners).
• Experience in Node.js / Java / Python, building REST APIs, with experience/exposure to front end stack like JavaScript & React / Angular. 
• Experience with Storage systems - RDBMS, NoSQL (Cassandra/MongoDB), Redis/Memcache/Aerospike.
• Experience in messaging tools like Kafka/AWS Kinesis etc...
• Design expertise for performance, scalability, fault tolerance and high availability

• Experience with POS systems and Payments domain.
• Demonstrated experience for systems architecture, design, and integration for POS systems
• Java and/or Node.js. Experience building micro services (REST APIs) using Node.js
• Experience with one or more RDBMS databases like MySql, PostGreSQL
• Experience with one or more NoSQL databses like MongoDB, Cassandra, DynamoDB, Aerospike, Elastic Search, Redis, neo4j etc.,
• Caching technologies like: Redis, Elasticache,
• Cloud Providers like: AWS/ Google Cloud / Azure
• CI / CD : Jenkins, Docker, Kubernete
  

Job Title : Python Developer - Web3 (Mandatory) & Trading Bot Creation (Optional)

Experience : 2+ Years

Location : Noida (On-site)

Working Days : 6 Days WFO (Monday to Friday - WFO & Saturday - WFH)

Job Type : Full-time

Mandatory Skills : Python, Web3 (web3.py/ethers), smart contract interaction, real-time APIs/WebSockets, Git/Docker, security handling.

Responsibilities :

• Build and optimize Web3-based applications & integrations using Python.
• Interact with smart contracts and manage on-chain/off-chain data flows.
• Ensure secure key management, scalability, and performance.
• (Optional) Develop and enhance automated trading bots & strategies.

Required Skills :

• Strong experience in Python development.
• Proficiency in Web3 (web3.py/ethers) and smart contract interaction.
• Hands-on with real-time APIs, WebSockets, Git/Docker.
• Knowledge of security handling & key management.
• (Optional) Trading bot development, CEX/DEX APIs, backtesting (pandas/numpy).

Key Responsibilities:

• Work on highly distributed and scalable system architecture

• Design, develop, test, and maintain high-quality software solutions

• Ensure performance, security, and maintainability of applications

• Collaborate with cross-functional teams and stakeholders

• Perform system testing and resolve technical issues

Required Skills:

• Strong experience in ASP.NET, C#, .NET Core, MVC

• Hands-on experience with SQL Server / PostgreSQL

• Experience in Angular / React (Frontend technologies)

• Knowledge of microservices architecture & RESTful APIs

• Familiarity with CQRS pattern

• Exposure to AWS / Docker / Kubernetes

• Experience with CI/CD pipelines (Azure DevOps, Jenkins)

• Knowledge of Node.js is an added advantage

• Understanding of Agile methodology

• Good exposure to cybersecurity and compliance

Technology Stack:

• Microsoft .NET technologies (primary)

• Cloud platforms: AWS (SaaS/PaaS/IaaS)

• Databases: MSSQL, MongoDB, PostgreSQL

• Caching: Redis, Memcached

• Messaging queues: RabbitMQ, Kafka, SQS

Java AWS engineer with experience in building AWS services like Lambda, Batch, SQS, S3, DynamoDB etc. using AWS Java SDK and Cloud formation templates.

• Java AWS engineer with experience in building AWS services like Lambda, Batch, SQS, S3, DynamoDB etc. using AWS Java SDK and Cloud formation templates.
• 4 to 8 years of experience in design, development and triaging for large, complex systems. Experience in Java and object-oriented design skills
• 3-4+ years of microservices development
• 2+ years working in Spring Boot
• Experienced using API dev tools like IntelliJ/Eclipse, Postman, Git, Cucumber
• Hands on experience in building microservices based application using Spring Boot and REST, JSON
• DevOps understanding – containers, cloud, automation, security, configuration management, CI/CD
• Experience using CICD processes for application software integration and deployment using Maven, Git, Jenkins.
• Experience dealing with NoSQL databases like Cassandra
• Experience building scalable and resilient applications in private or public cloud environments and cloud technologies
• Experience in Utilizing tools such as Maven, Docker, Kubernetes, ELK, Jenkins
• Agile Software Development (typically Scrum, Kanban, Safe)
• Experience with API gateway and API security.

• Understand fundamental design principles and best practices for developing backend servers and web applications  Gather requirements, scope functionality, estimate and translate those requirements into solutions.  
• Implement and integrate software features as per requirements. 
•  Deliver across the entire app life cycle.
•   Work in a product creation project and/or technology project with implementation or integration responsibilities, Improve an existing code base, if required, and ability to read source code to understand data flow and origin
• Design effective data storage for the task at hand and know how to optimize query performance along the way.  
• Follow an agile methodology of development and delivery  
• Strictly adhere to coding standards and internal practices; must be able to conduct review code  Mentor and possibly lead junior developers  
• Contribute towards innovation  Performance optimization of apps 
•  Explain technologies and solutions to technical and non-technical stakeholders  
• Diagnose bugs and other issues in products  
• Continuously discover, evaluate, and implement new technologies to maximize development efficiency

Must have / Good to have:

• 4+ years experience with Core Python development  Design and implementation of high-availability, and performant applications on Unix environment  
• Good with multithreading and data structures  
• Develop back-end components to improve responsiveness and overall performance  
• Familiarity with database design, integration wiht applications and python packaging.  Familiarity with front-end technologies (like JavaScript and HTML5), REST API, security considerations  
• Familiarity with functional testing and deployment automation frameworks  
• Experience in development for 3-4 production ready application using Python as programming language  
• Experience in writing unit test cases including positive and negative test cases 
•  Experience of CI/CD pipeline code deployment (Git, SVN, Jenkins or Teamcity) 
•  Experience with Agile and DevOps methodology 
•  Very good problem-solving skills  
• Experience with Web technologies is a plus  
• Experience with ELK stack is a plus.

About PrepBytes(A CollegeDekho company)

PrepBytes(A CollegeDekho company) is a Gurgaon-based ed-tech startup focused on helping students improve their coding skills. PrepBytes offers India’s only Mentorship driven personalized coding programs.

In a short span of time , we have achieved a reach in 1000+ engineering colleges and established a brand among 100k+ students. 

PrepBytes was started by two IIT/NIT Alumnus having work experience in fast paced startups & tech giants like Amazon and Samsung. Since then, the startup has grown into a team of individuals working towards revolutionizing the way students learn coding and making them successful in their tech career. 

To fulfill the vision to be one of the largest personalised coding platforms , we are looking for passionate folks to join our team & contribute to success stories of thousands of students and be part of the next big revolution in the edtech industry.

Job Description

• Working with the founders to implement innovative ideas and improvising the existing backend.
• Development and implementation of cutting-edge Educational Technology with the aim of revolutionizing the sector.
• Work on innovative features of the Learning Management System, Coding Platforms, Hiring Platforms, Assessment Platforms, and many more new products.
• Building scalable and secured backend for smooth learning of users
• Get involved and mentor in System, Architecture, and Database Design discussions with the team
• Maintain high-quality code by getting involved in code reviews

What are we looking for?

• Overall 4+ years of technical experience.
• Bachelor’s degree in Computer Science Engineering or a related field.
• Strong problem-solving skills.
• A keen learner who will develop & own cutting-edge consumer-facing product 
• Experience in building projects from scratch.
• Excellent technical, diagnostic, and troubleshooting skills.
• High-level proficiency in Javascript and web development technologies-JS/Node JS/MongoDB.

What you need to have: 

Job Responsibilities:

• Design and build efficient, scalable systems that are used by millions of people,
• Own what you build as you create, test, and refine what’s under the hood of our pages and services,
• Investigate production issues pertaining to customer features to determine root cause and implement solutions,
• Investigate existing queries and write new queries with performance optimization in mind,
• Build well-designed software in a way that is generic, reusable, and easily extensible, as well as solves the business needs and requirements,
• Collaborate with product managers, designers, and software engineers to ensure design vision is maintained, the final markup is standards compliant, and UI deliverables are completed on time,
• Work with the real-time feedback from our users (external and internal) to make the products better,
• Discover, design, develop, deploy, debug. Repeat!

Requirements:

• 1-2 years of experience,
• Proficiency in web scripting programming with PHP,
• Experience with MySQL Databases,
• Top-notch programming skills in JavaScript and a strong understanding of web fundamentals,
• Design, build and maintain high performance, scalable and secure code,
• Experience with cloud services like AWS is plus,
• Experience with MVC architecture is a plus,
• Knowledge / experience in building an API,
• Solid understanding of the foundations of security and best practices,
• Good grasp of data structures and algorithms,
• Excellent problem-solving skills,
• Take ownership of the backend services, ensure the best possible performance, quality and responsiveness, as well as maintaining code quality, organisation and testing/deployment,
• Passionate about technology and willing to develop expertise in an emerging field,
• Strong organisational and communication skills, team player.

Perquisites & Benefits:

• A competitive salary,
• Opportunity to be part of a diverse working environment, valuable social sector work experience,
• Fun, casual, relaxed, and flexible work environment.