Backend Developer

Key Responsibilities

• Design and develop system-level components on the Windows platform using C/C++
• Knowledge on Windows security, authentication, and credential management modules
• Troubleshoot and debug low-level Windows OS issues
• Collaborate with cross-functional teams to deliver secure and scalable solutions
• Ensure code quality, performance optimization, and adherence to best practices

Required Skills

• Strong programming experience in C/C++
• Hands-on experience with Windows OS internals and Windows platform development
• Good understanding of:
• Windows Security & Authentication
• Windows Credentials
• Cryptography concepts
• Kerberos
• Secure Enclave / Trusted Platform Module (TPM)
• Strong debugging and problem-solving skills

Backend Engineer III – Senior Python Developer (LLM & AI)

Location: Gurgaon, India

Positions: 1

Experience: 6 to 9 Years

Gurgaon Hybrid

About the Role

We are seeking an experienced Backend Engineer III / Senior Python Developer to join our AI engineering team and play a critical role in building scalable, secure, and high-performance backend platforms for LLM and AI-driven applications. You will work as a hands-on individual contributor while collaborating closely with Machine Learning Engineers, Data Scientists, Product Managers, and Cloud/DevOps teams to deliver innovative, production-grade AI solutions.

Key Responsibilities

• Design, develop, and maintain scalable backend systems and services using Python to support LLM and AI-based applications
• Build and maintain RESTful APIs and microservices that serve machine learning models and AI components
• Write clean, modular, efficient, and testable code following industry best practices and coding standards
• Participate actively in code reviews, ensuring high quality, security, and maintainability of the codebase
• Debug, profile, and optimize applications to improve performance, reliability, and scalability
• Identify and resolve performance bottlenecks in AI/ML pipelines and backend services
• Collaborate with ML engineers, data scientists, and product teams to translate business and technical requirements into robust backend solutions
• Mentor and support junior developers, promoting a culture of technical excellence and continuous learning
• Design and implement CI/CD pipelines and automate deployment workflows to ensure consistent and reliable releases
• Stay up to date with emerging trends in Python, cloud-native development, and LLM/AI engineering practices and apply them to improve systems and processes

Required Skills & Experience

• 6 to 9 years of strong hands-on experience in Python development
• Solid understanding of Python software design, architecture patterns, and testing best practices
• Proven experience working on AI, Machine Learning, or LLM-based projects
• Strong experience in building and consuming RESTful APIs and microservices architectures
• Hands-on experience with FastAPI, Flask, or similar model-serving frameworks
• Strong debugging, performance profiling, and optimization skills
• Experience with CI/CD tools and workflows (e.g., GitHub Actions, Azure DevOps, Jenkins, etc.)
• Working knowledge of Docker and Kubernetes is a strong plus
• Excellent analytical, problem-solving, and communication skills
• Ability to work independently in a fast-paced, evolving AI/ML environment while mentoring junior team members

Education & Certifications

• Bachelor’s degree in Computer Science, Software Engineering, or a related technical field
• AWS or other relevant cloud certifications are preferred but not mandatory

Why Join Us?

• Work on cutting-edge AI and LLM platforms
• Collaborate with top-tier engineering and data science teams
• Opportunity to influence system architecture and technical direction
• Competitive compensation and career growth opportunities

As a Node.js Developer, you will be responsible for:

Designing, developing, and maintaining server-side applications and systems using Node.js, a JavaScript runtime environment. Your expertise in backend development, JavaScript, TypeScript, and REST APIs will play an essential role in creating efficient and powerful server-side applications.

Responsibilities:

● Design and implement efficient, secure, and maintainable server-side code using Node.js.

● Collaborate with the front-end development team to integrate user-facing elements with server-side logic.

● Develop APIs for seamless data flow between the front-end and back-end.

● Optimize application performance and ensure high availability and scalability.

To succeed in this role – you should have the following:

● Minimum of 3-4 years of experience as a backend developer.

● Must have proven experience as a Back-End Developer, with a focus on Node.js.

● Proficiency in JavaScript, TypeScript, and related frameworks (Express.js, Hapi.js, etc.).

● Experience with RESTful API design principles.

● Experience with agile development methodologies.

● Familiarity with working with at least one of PostgreSQL or MongoDB.

● Familiarity with version control systems (Git)

● Strong communication skills and ability to work collaboratively in a team.

● Strong problem-solving skills and attention to detail.

Added bonus:

● Familiarity with frontend development technologies like HTML and CSS.

● Experience working with Docker, Github Actions, and other common CI/CD pipelines

● Knowledge about AWS components (S3, EC2, Cloudfront, Redis Clusters, etc.)

Education:

Bachelor's degree in Computer Science, Information Technology, or a related field

Basic Qualifications:

• 3+ years of non-internship professional software development experience
• Programming experience with at least one modern language such as Java, C++, or C# including object-oriented design
• 1+ years of experience contributing to the architecture and design (architecture, design patterns, reliability and scaling) of new and current systems.

Additional Job requirements

• BS/MS/PhD in Computer Science/Math or equivalent
• BS in computer science or related field.
• 2+ years of relevant professional software development experience: designing, developing, and delivering software written in Java, C#, or C++, web development.
• Knowledgeable in object-oriented design patterns.
• Experience building highly scalable and distributed systems

Preferred Qualifications

• Experience with service-oriented architecture and application/services development
• Passion for performance debugging and benchmarking

Ability to clearly and concisely communicate with technical and non-technical stakeholders across all levels of the organization

Detailed JD: 

Responsibilities:

- Interface with product owners and software architects to review and finalize requirements

- Participate in the full SDLC including analysis, design, development, testing, deployment, and support

of new features and applications

- Actively lead and participate in agile ceremonies (Standups, Refinements, Retrospectives, Planning,

and Requirement discussions)

- Communicate effectively, clearly, and thoroughly with the Scrum Team and Stakeholders

- Provide innovative solutions to complex problems

- Design, develop and modify software applications/systems according to specifications

- Develop technical documentation including services, object, and data model

- Create high quality code and perform code reviews

- Create unit and integration tests to ensure the code quality and functionality

- Proactively learn and share knowledge of technology and compare advantages and disadvantages of

alternative solutions/technologies

- Identify areas needing process improvements and see them through to resolution

- Support and coach other Developers, provide technical guidance

- Help onboard new team members

Tech Stack:

C#, .NET Core, XUnit, Entity Framework Core, MS SQL Server, PostgreSQL, Git, JIRA, Web API

Job Description

• 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 website.
• Collaborate with the frontend team, and enable connectors with WordPress REST API and other tech platforms

Requirements

Relevant experience

• 2-4 years’ experience in authoring and developing for CMS’s including but not limited to WordPress

Required qualification

• University degree or equivalent diploma in technology and computer science.

Essential skills

• Good Overall knowledge of PHP
• Good understanding of front-end technologies, including HTML5, CSS3, JavaScript, jQuery
• Knowing the nuances of WordPress Themes – Installation and Configuration
• Knowing the nuances of WordPress Plugins with good coverage of which plugin is best suited for a particular requirement, and confidence to research plugins as well
• Knowledge of WP Caching, WP Query Object and WP Database Structure
• Knowledge of Knowledge of WordPress Scalability
• Knowing the nuances of WordPress editor with good coverage of which editor is best suited for a particular requirement, and confidence to research plugins as well
• Hands On Experience with Gutenberg Editor and Blocks
• Awareness of the WP Library, and Architectural Concepts is a must
• 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 Wordpress pages
• Willingness to quickly learn new frameworks, changing theme market with ready updates on not just WordPress, but also PHP.

Nice to Have

• It would be good to have exposure to multiple CMSs like Shopify, Magento
• It would be good to have the ability to develop WordPress Plugins and Themes From scratch
• Experience on at least one PHP Framework (CodeIgniter, Laravel, YII)
• Knowledge of how to interact with RESTful APIs and formats (JSON, XML)
• Proficient understanding of code versioning tools (such as Git, SVN, and Mercurial)
• Strong understanding of PHP back-end development
• Knowledge of WordPress REST API
• Knowledge of WooCommerce

Benefits

• Unlimited learning and growth opportunities 
• A collaborative and cheerful work environment 
• Exceptional reward and recognition policy  
• Outstanding compensation  
• Flexible work hours  
• Opportunity to make an impact as your work will directly contribute to our business strategy
• 
  

At Nickelfox, you have a chance to craft a career path as unique as you are and become the best version of YOU. You will be part of a team with a ‘no limits’ mindset in an inclusive, people-focused culture. And we’re counting on your unique perspective to help Nickelfox grow even faster.  

Are you passionate about tech? Dedicated to learning? Come, join us to build an extraordinary experience for yourself and a dignified working world for all. 

What makes Nickelfox a great place for you?

In Nickelfox, you’ll join a team whose passion for technology and understanding of business has driven the company to serve clients across 25+ countries in just five years. We partner with our customers to fuel their growth story and enable them to make the right decisions with our customized technology services and insights. All in all, we are passionate to see our customers win the day. This is the reason 80% of our business comes from repeat clients.  

Our mission is to provide dignified employment and an environment that recognizes the uniqueness of every individual and values their expertise, and contribution. We have a culture that encourages everyone to bring their authentic selves to work. Our people enjoy a collaborative work environment with exceptional training and career development. If you like working with a curious, youthful, high-performing team, Nickelfox is the place for you.

Your main responsibility will be designing and implementing applications that are written in PHP. This means you will work closely with front end developers to integrate backend components with the components they’re creating for users to interact with.

Responsibilities

• Integration of user-facing elements developed by front-end developers
• Build efficient, testable, and reusable PHP modules
• Solve complex performance problems and architectural challenges
• Integration of data storage solutions
Skills And Qualifications
• Strong knowledge of PHP web frameworks such as cake php, Laravel, Yii, etc depending on your technology stack
• 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