Fullstack Developer

About koolio.ai

Website: www.koolio.ai

Koolio Inc. is a cutting-edge Silicon Valley startup dedicated to transforming how stories are told through audio. Our mission is to democratize audio content creation by empowering individuals and businesses to effortlessly produce high-quality, professional-grade content. Leveraging AI and intuitive web-based tools, koolio.ai enables creators to craft, edit, and distribute audio content—from storytelling to educational materials, brand marketing, and beyond. We are passionate about helping people and organizations share their voices, fostering creativity, collaboration, and engaging storytelling for a wide range of use cases.

About the Internship Position

We are looking for a motivated full-time Software Development Intern to join our innovative team. As an intern at koolio.ai, you’ll have the opportunity to work on a next-gen AI-powered platform and gain hands-on experience developing and optimizing backend systems that power our platform. This internship is ideal for students or recent graduates who are passionate about backend technologies and eager to learn in a dynamic, fast-paced startup environment.

Key Responsibilities:

• Assist in the development and maintenance of backend systems and APIs.
• Write reusable, testable, and efficient code to support scalable web applications.
• Work with cloud services and server-side technologies to manage data and optimize performance.
• Collaborate with cross-functional teams to integrate frontend features with backend logic.
• Collaborate with the product and design teams to develop and implement user-friendly web interfaces
• Ensure responsive design and optimize web pages for performance and scalability across devices
• Debug and resolve issues, improving the overall user experience on the platform and ensuring reliability
• Assist in integrating APIs and frontend services with the backend
• Stay up-to-date with the latest trends and suggest improvements to enhance the platform’s functionality

Requirements and Skills:

• Education: Currently pursuing or recently completed a degree in Computer Science, Engineering, or a related field.
• Technical Skills:
• Good understanding of server-side technologies like Python
• Familiarity with REST APIs and database systems (e.g., MySQL, PostgreSQL, or NoSQL databases).
• Exposure to cloud platforms like AWS, Google Cloud, or Azure is a plus.
• Knowledge of version control systems such as Git.
• Strong proficiency in JavaScript frameworks like ReactJS or Redux
• Proficiency in frontend languages such as HTML, CSS, and JavaScript (ES6+)
• Soft Skills:
• Eagerness to learn and adapt in a fast-paced environment.
• Strong problem-solving and critical-thinking skills.
• Effective communication and teamwork capabilities.
• Other Skills: Familiarity with CI/CD pipelines and basic knowledge of containerization (e.g., Docker) is a bonus.

Why Join Us?

• Gain real-world experience working on a cutting-edge platform.
• Work alongside a talented and passionate team committed to innovation.
• Receive mentorship and guidance from industry experts.
• Opportunity to transition to a full-time role based on performance and company needs.

This internship is an excellent opportunity to kickstart your career in software development, build critical skills, and contribute to a product that has a real-world impact.

Role Overview

We are looking for an experienced Node.js Developer with deep expertise in backend engineering and related frameworks. The ideal candidate will be a strong problem solver, effective communicator, and proven mentor capable of leading development initiatives while ensuring code quality, scalability, and performance optimization.

Key Responsibilities

• Lead and contribute to multiple backend development projects ensuring high-quality delivery.
• Collaborate with business analysts, architects, and cross-functional teams to define technical specifications and gather requirements.
• Design and implement scalable, secure, and high-performance applications using Node.js and related frameworks.
• Develop detailed HLD (High-Level Design) and LLD (Low-Level Design) solutions.
• Mentor and guide junior developers, fostering knowledge sharing and growth.
• Participate in peer code reviews, ensuring adherence to best practices and coding standards.
• Optimize performance, concurrency, and scalability of applications.
• Implement CI/CD pipelines and ensure smooth deployment processes.
• Support and troubleshoot production issues, providing L3 support as required.
• Continuously research, evaluate, and integrate new technologies to improve applications and processes.
• Establish and enforce engineering best practices within the team.
• Actively participate in recruitment and talent-building initiatives.

Required Skills & Qualifications

• 5–10 years of strong professional experience in Node.js and frameworks like Express.js.
• Proficiency in MERN stack (preferred but must be heavy on Node.js).
• Strong understanding of multi-threading, concurrency, and performance optimization.
• Solid debugging, troubleshooting, and performance profiling expertise.
• Hands-on experience with source control systems (Git) and CI/CD environments.
• Familiarity with Agile methodologies (Scrum/Kanban).
• Strong knowledge of object-oriented and service-oriented application development.
• Excellent communication, leadership, and collaboration skills.
• Proven ability to work independently and in team settings with high ownership.

Job Description

• Designing system architecture, develop and maintain high performing & scalable services using Node.js frameworks.
• Extensively engage in iterative development model right from requirement analysis, estimation, development, testing & production support
• Mentor, groom junior developers and participate in code reviews
• Contribute towards building company’s coding culture

Requirements

• 3+ years of relevant industry experience in Node.js
• A deep understanding of JavaScript
• Experience working with SQL and NoSQL databases
• Experience with Unit and Integration tests
• Experience with CI/CD
• Experience with MathJax/Latex
• Experience with large scale video streaming
• Experience with ReactJS is a bonus

In this role, you will:

• Integrate user-facing elements developed by front-end developers.
• Build efficient, testable, and reusable PHP modules.
• Solve complex performance problems and architectural challenges.
• Integrate data storage solutions.

You may be a fit if you have:

• 2 – 4 years of experience in building PHP web frameworks such as Lavarel.
• Understand the fully synchronous behavior of PHP.
• Understanding of MVC design patterns
• A proficient understanding building rich UI & front-end technologies, such as JavaScript,

HTML5, and CSS3.

• Working knowledge of object-oriented PHP programming
• Understanding of accessibility and security compliance.
• Strong knowledge of the common PHP or web server exploits and their solutions.
• Experience in using fundamental design principles for a scalable application.
• Knowledge of user authentication and authorization between multiple systems, servers, and environments.

• Knowledge of Integrating multiple data sources and databases into one system.
• Familiarity with limitations of PHP as a platform and its workarounds.
• Understanding of creating database schemas that represent and support business processes.
• Familiarity with SQL/NoSQL, Postgresql databases and their declarative query languages

Requirements:

• Required experience of 3 to 8 years

• Required Skill Set: Core Java, Java 8, Spring, Spring Boot, Database, Unit Testing & Rest API.

• Good to have Microservices

• Familiarity with concepts of MVC, JDBC, and RESTful

• You will be responsible to perform- requirement analysis, high-level design, coding, unit testing, and general quality assurance of the web applications

• Knack for writing clean, readable Java code

• Understanding fundamental design principles behind a scalable application

• Good to have knowledge of Spring Security, and JPA

Responsibilities:

• Designing and implementing Java-based applications.

• Analyzing user requirements to inform application design.

• Defining application objectives and functionality.

• Aligning application design with business goals.

• Developing and testing software.

• Debugging and resolving technical problems that arise.

• Producing detailed design documentation.

• Recommending changes to existing Java infrastructure.

• Developing multimedia applications.

REQUIRED SKILLS:

• 8+ years experience in web application development and architecture.
• ·Extensive experience using open source software libraries
• Strong experience in at least one MVC architecture or application of the pattern
• Solid hands on experience with Java
• Strong experience with SQL ( Oracle, MySQL, Postgres)
• Strong experience in Data Structures & Algorithms
• ·Must have built end to end continuous integration and deployment infrastructure for micro services
• Strong commitment to good engineering discipline and process including code reviews and delivering unit tests in conjunction with feature delivery
• Must possess excellent communication and teamwork skills. Strong presentation and facilitation skills are required.
• Self-starter that is results focused with the ability to work independently and in teams.
•  

GOOD TO HAVE:

• Prior experience building modular, common and scalable services
• Experience using chef, puppet or other deployment automation tools
• Experience working within a distributed engineering team including offshore
• Bonus points if you have contributed to an open source project
• Familiarity and experience with agile (scrum) development process
• Proven track record of identifying and championing new technologies that enhance the end-user experience, software quality, and developer productivity

Responsibilities

• Designing and implementing new features and functionality
• Establishing and guiding the website’s architecture
• Ensuring high-performance and availability, and managing all technical aspects of the CMS
• Helping formulate an effective, responsive design and turning it into a working theme and plugin.

Skills and Qualifications

• Good understanding of front-end technologies, including HTML5, CSS3, JavaScript, jQuery
• Experience building user interfaces for websites and/or web applications
• Experience designing and developing responsive design websites
• Comfortable working with debugging tools like Firebug, Chrome inspector, etc.
• Ability to understand CSS changes and their ramifications to ensure consistent style across platforms and browsers
• Ability to convert comprehensive layout and wireframes into working HTML pages
• Knowledge of how to interact with RESTful APIs and formats (JSON, XML)
• Strong understanding of PHP back-end development