

About Duplex Technologies Services
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About the role:
We’re looking for a highly skilled and self-driven Node.js Software Development Engineer (SDE-2) to join our team on a contract basis. You’ll be responsible for building scalable backend services and APIs that power our products, with a focus on performance, security, and reliability.
As an SDE-2, you’re expected to take ownership of features end-to-end, mentor junior developers when needed, and contribute to architectural discussions.
Key Responsibilities
- Design, build, and maintain RESTful, gRPC, and/or GraphQL APIs using Node.js
- Write clean, modular, and testable code
- Collaborate closely with product managers, frontend engineers, and DevOps teams
- Optimize existing codebases for performance and scalability
- Integrate with third-party services and internal microservices
- Participate in code reviews and ensure coding best practices are followed
- Write unit and integration tests (e.g., using Jest, Mocha, etc.)
Required Skills & Experience
- 3–5 years of experience building production-grade backend applications
- Strong proficiency in Node.js (Express.js, NestJS, or similar frameworks)
- Solid understanding of JavaScript/TypeScript
- Experience with MongoDB, PostgreSQL, or MySQL
- Experience building APIs that scale — rate limiting, caching, pagination, etc.
- Good understanding of async patterns (Promises, async/await, queues)
- Familiarity with CI/CD, Git workflows, and containerized deployments (Docker)
- Experience working with cloud services (AWS/GCP/Azure)
Nice to Have
- Experience with microservices architecture
- Familiarity with message brokers (Kafka, RabbitMQ, etc.)
- Experience working in Agile or Scrum teams
- Contributions to open-source projects or tech blogs


Python Backend Developer (5+ years experience)
We are seeking an experienced Python Backend Developer with at least 5 years of hands-on experience in Python and Django development. The ideal candidate will have a strong background in MySQL and MongoDB databases, as well as knowledge of HTML, CSS, JavaScript frameworks, and cloud technologies like AWS, Azure or Google Cloud.Key Responsibilities:
- Design and develop scalable, high-performance Python applications using the Django framework
- Write clean, maintainable, and well-documented code
- Optimize database queries and schema design for improved performance
- Integrate applications with various APIs and third-party services
- Collaborate with cross-functional teams to gather requirements and deliver solutions
- Participate in code reviews, testing, and deployment processes
- Continuously learn and stay updated with the latest technologies and best practices
Required Skills and Experience:
- Bachelor's or Master's degree in Computer Science, Information Technology or a related field
- 5+ years of professional experience in Python and Django development
- Proficient in MySQL and MongoDB databases, with the ability to write complex queries and optimize database performance
- Hands-on experience with HTML, CSS, and at least one JavaScript framework (e.g., React, Angular, Vue.js)
- Knowledge of cloud technologies like AWS, Azure, or Google Cloud is preferred
- Strong problem-solving and algorithmic skills
- Excellent communication and teamwork skills
- Passion for continuous learning and innovation
Preferred Qualifications:
- Experience in developing and deploying applications on cloud platforms
- Knowledge of containerization technologies like Docker and Kubernetes added advantages


We are currently looking for a PHP Codeigniter Developer with 2+ years of experience.
Skills: PHP(CodeIgniter knowledge is a must), MySQL, HTML, CSS, JavaScript, Jquery, AJAX, responsive front-end frameworks (e.g. Bootstrap), Git.
PHP Codeigniter Developer:
- Strong knowledge of PHP web frameworks (Codeigniter)
- Understanding the fully synchronous behavior of PHP
- Understanding of MVC design patterns
- Basic understanding of front-end technologies, such as JavaScript, HTML5, and CSS3
- Knowledge of object oriented PHP programming
- Understanding accessibility and security compliance
- Strong knowledge of the common PHP or web server exploits and their solutions
- Understanding fundamental design principles behind a scalable application
- User authentication and authorization between multiple systems, servers, and environments
- Integration of multiple data sources and databases into one system
- Familiarity with limitations of PHP as a platform and its workarounds
- Creating database schemas that represent and support business processes
- Familiarity with SQL/NoSQL databases and their declarative query languages
- Proficient understanding of code versioning tools, such as Git
- Experience in common third-party APIs (Google, Facebook, Ebay etc)
- Good knowledge of relational databases, version control tools and of developing web services
- Passion for best design and coding practices and a desire to develop new bold ideas
- Attend daily stand-up meetings to provide updates on project status
- Abilities from requirements gathering to successful deployment
Requirements:
-
Minimum 2 to 4 years of experience in PHP CodeIgniter
-
Experience using MVC Frameworks such as CodeIgniter
- Knowledge of PHP web frameworks including Yii, Laravel, and CodeIgniter.
- Knowledge of front-end technologies including CSS3, JavaScript, and HTML5.
- Understanding of object-oriented PHP programming.
- Previous experience creating scalable applications.
- Proficient with code versioning tools including Git, Mercurial, CVS, and SVN.
- Familiarity with SQL/NoSQL databases.
- Good problem-solving skills.
Required Skills:
- PHP
- JavaScript Frameworks
- OOP
- Data and Data modeling
- HTML5/CSS3


Job description:
Core PHP (Knowledge of functions, Methods, PHP OOPS Concept, Ajax, MySQL, Jquery), Javascript, Basic knowledge of HTML, CSS, MVC Structure
Knowledge about socket

About us :
Infosec Ventures incubates and scales cyber security innovators that solve for inefficiencies in cyber security, solve big problems and deliver exceptionally high return on investment for customers. We are on a mission to make the world cyber safe, by protecting systems and the 'human operating system'. Some notable current ventures include humanfirewall.io, emailauth.io, bugsbounty.com, securityrating.com among others. An idea is worth one dollar, it's the execution that adds the zeros at the end of it, to make it a billion dollars!
Job Description :
If you are a software developer, and have hands-on experience with
- Laravel and/or NodeJS
- Angular JS, VUE JS
- Mongo, MySQL
- You have built SaaS products
Roles :
- The person is responsible coding, designing and modifying web applications, from layout to -function and according to a product's specifications.
- Strive to create visually appealing applications that feature user-friendly design and clear navigation.
- Deep expertise and hands on experience with Web Applications and programming languages such as Laravel framework, Laravel 5 Framework, PHP 7, MySQL, HTML, CSS, JavaScript,
- JQuery, Angular JS, Node JS and REST APIs.
- Exposure in developing apps using HTML5, JavaScript, JQuery, SQLite and CSS3
- Very good debugging skills to solve complex problems without much assistance.

Description
Experience: 1.5 to 3 yrs
* Hands on work experience developing in Java and J2EE
* Hands on work experience developing in JavaScript
* Extensive working experience in Springboot
* Good to have No SQL (Mongo DB) and My SQL Exposure
* Good to have experience in AWS cloud environment
* Designing, developing, troubleshooting and debugging software within a project scope ensuring that work product meets end user acceptance criteria.
* Managing self-directed assignments to resolve software defects or implement features to meet schedule commitments with a high-level of quality.
* Acquiring knowledge of industry and company standards, tools and technology with a focus on pragmatic application to business-focused software solutions through initiative and self-study
Requirements
Primary Skill Java Springboot, Java Script
Good to have Mongo Db (No Sql), My SQL and Exposure to AWS
Benefits
Salary:300000 LPA to 500000 LPA


Minimum 3+ Years of hands-on experience in developing Python Applications.
Excellent knowledge of Python and experience in or in-depth understanding of core Python
Knowledge in Lists, Tuples, and Dictionaries
Excellent knowledge of Python Constructor- Parameterized and Non-Parameterized
Must have experience in core python concepts about data structure, OOPS concepts, XML parsing, XML to JSON, optimizations
Developers should have developed Web Based applications., back end, SQL
Agile and scrum methodology
Should not be test automation, Application development frame work
Excellent Communication Skill
Good to Have
Django/ Flask
Strong Hands-on experience in HTML, CSS, DTL(Django Template Language), SASS.
knowledge of SQL


