


Fulfil’s software engineers develop the next-generation technologies that change how millions of customer orders are fulfilled by merchants. Our products need to handle information at massive scale. We're looking for engineers who bring fresh ideas from all areas into our technology.
As a senior software engineer, you will work on our python based ORM and applications that scales to handle millions of transactions every hour. This is mission critical software and your primary focus will be building robust and scalable solutions that are easy to maintain.
In this role, you will be collaborating closely with the rest of the team working on different layers of infrastructure in an international environment. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product are important.
What You’ll Do:
- Own definition and implementation of API interfaces (REST and GraphQL). We take pride in our 100% open API with over 600 endpoints.
- Implement simple solutions to complex business logic that enables our merchants to manage financials, orders and shipments across millions of transactions.
- Build reusable components and packages for future use.
- Translate specs and user stories into reviewable, test covered patches.
- Peer review code and refactor existing code.
- Integrate with our eCommerce partners (Shopify, BigCommerce, Amazon), shipping partners (UPS, USPS, FedEx, DHL) and EDI.
- Manage Kubernetes and Docker based global deployment of our infrastructure.
Requirements We’re Looking for Someone With:
- Experience working with ORMs like SQLAlchemy or Django (2-3 years)
- Experience with SQL and databases (Postgres preferred)
- Experience in developing large server side applications and microservices
- Ability to create high quality code
- Experience with python testing tools (pytest) and test automation
- Familiarity with code versioning tools like GIT
- Strong sense of ownership and leadership quality
- Experienced in the tools of our web stack- Python, Celery, Postgres, Redis, RabbitMQ
Nice to Haves:
- Prior experience at a growth stage Internet/Software company
- Experience with ReactJS, Google Cloud, Heroku
- Cloud deployment and scaling experience

About Fulfil.IO
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Job Title: Senior Backend Developer
Location: Sector 58, Noida (On-site)
Type: Full-time | Founding Team
Experience: 4–5 Years
About the Company:
Weya AI is on a mission to revolutionize how businesses communicate with their customers. Our intelligent AI agents automate voice, Whatsapp, and email interactions- powering end-to-end support, collections, onboarding, and more for banks, NBFCs and fintechs. We're building the future of customer engagement: AI systems that talk like humans, operate at scale, and deliver 24/7 responsiveness with precision.
If you're looking to work on real-world AI problems with enterprise impact, Weya AI is one of the most mission-driven startups you can join right now.
About the Role:
As a Senior Backend Developer at Weya.ai, you’ll join our core founding tech team and take full ownership of backend systems that power our real-time AI communication stack.
This isn’t just a development job — it's a leadership opportunity to help scale a live product already in production. You'll architect, build, and optimize scalable, secure backend services while collaborating across AI, frontend, and telephony teams. Expect rapid release cycles, close collaboration with founders, and the freedom to influence architecture, tooling, and team culture.
What You'll Do?
- Architect and build scalable microservices using Node.js or Go
- Design clean, secure APIs and data pipelines for real-time voice and chat systems
- Manage cloud infrastructure on Azure or AWS (App Services, containers, databases)
- Optimize backend systems for performance, cost-efficiency, and reliability
- Collaborate with product, AI, and frontend teams to launch new features rapidly
- Own deployments, monitoring, and backend stability in a production environment
- Contribute to code reviews, system design decisions, and long-term architecture strategy
What We're Looking For?
- 4-5 years of backend or full-stack experience with Node.js, Go (Golang), React, PostgreSQL or MongoDB
- Strong understanding of system design, microservice architecture, and clean code practices
- Experience deploying and scaling cloud applications on Azure or AWS
- Proven track record of delivering end-to-end features in SaaS, voice tech, or AI-driven platforms
- A product-first mindset — you think about UX and business impact, not just code
- Strong communication, ownership, and cross-functional collaboration skills
- A self-starter attitude — you thrive in startup environments and ambiguity
Good-to-Have (Bonus Points)
- Exposure to Next.js, or frontend integration workflows
- Familiarity with CRM integrations, WhatsApp APIs, Twilio, or Knowlarity
- Experience in early-stage startups or mentoring junior engineers
- Passion for AI, voice interfaces, or building tools that transform CX
What You'll Get?
- High Ownership: Your code and work directly impact and helps businesses scale across India and the US
- Direct client and live Product Exposure: No red tape culture, Ideas get shipped, not stuck in slides Work
- Founding Team Vibe: Influence our tech stack, culture, and product roadmap
- Career Growth: Build, lead, and scale systems at the heart of a fast-growing AI startup
Let’s Build the Future of Conversations.
If you're excited about scaling backend systems, building impactful tech, and owning your work — apply now!
Apply now!

What We’re Looking For:
- Strong experience in Python (5+ years).
- Hands-on experience with any database (SQL or NoSQL).
- Experience with frameworks like Flask, FastAPI, or Django.
- Knowledge of ORMs, API development, and unit testing


Responsibilities and Duties:
- Expert in Python, with knowledge of Python web framework - Django
- Familiarity with backend automated testing tools and frameworks
- Experience with backend/API development
- Architect, develop and maintain backend libraries/codebase, database & server.
- Develop object-oriented software, with mastery of one or more relevant languages (Django).
- Evaluate competitive and innovative products and design approaches to identify best practices and encourage innovation.
- Understanding the requirement of a client, document the scope and chart out a plan of implementing the scope
- Work with design team to give inputs related to the wire-frames and then the design along with incorporating Client Feedback
- Explore the difference between B2B and B2C projects before implementing the code
- Work in teams of 2-3 on various projects as per the requirement using git as version control
- Having good knowledge of APIs creation and database architecture
- Good Grasp in respective technology (Django)
- Documenting the process and main functions along the developing process
- Design and develop highly scalable, highly available, reliable, secure, and fault-tolerant systems with minimal guidance for one of the fastest-growing companies in India.
Required Experience, Skills and Qualifications:
- 3-5 years of experience required
- Strong hand on Django-Python
- Excellent knowledge of using the Git version control system and deployment via Git.
- You have creative visualization, critical thinking, deductive & pragmatic reasoning and can think out-of-the-box
- Ability to quickly adapt & independently work in a fast-paced Agile environment with minimum supervision.
- A self-starter with demonstrated ability to take initiative, who can proactively identify issues/opportunities and recommend action.


Location: Chennai, Pune,Banglore,jaipurExp: 5 yrs to 8 yrs
- Implement best practices for the engineering team across code hygiene, overall architecture design, testing, and deployment activities
- Drive technical decisions for building data pipelines, data lakes, and analyst access.
- Act as a leader within the engineering team, providing support and mentorship for teammates across functions
- Bachelor’s Degree in Computer Science or equivalent job experience
- Experienced developer in large data environments
- Experience using Git productively in a team environment
- Experience with Docker
- Experience with Amazon Web Services
- Ability to sit with business or technical SMEs to listen, learn and propose technical solutions to business problems
· Experience using and adapting to new technologies
· Take and understand business requirements and goals
· Work collaboratively with project managers and stakeholders to make sure that all aspects of the project are delivered as planned
· Strong SQL skills with MySQL or PostgreSQL
- Experience with non-relational databases and their role in web architectures desired
Knowledge and Experience:
- Good experience with Elixir and functional programming a plus
- Several years of python experience
- Excellent analytical and problem-solving skills
- Excellent organizational skills
Proven verbal and written cross-department and customer communication skills
Bachelor's or Master's degree in Computer Science, Information Systems,
or equivalent.
EXPERIENCE – 2 to 5 years
CTC - UPTO 5.4L P.A.
JOB DESCRIPTION
We are looking for a backend developer who will be responsible for designing,
implementing, and supporting a distributed blockchain-based network. Your primary
responsibility will be analysing requirements, designing Blockchain technology around
a certain business model, and the building and launching of a blockchain network. You
will be asked to work on various blockchain technologies like Ethereum (Layer 1 & 2,
i.e Binance Smart Chain ).
● Analytical, results-driven Back-end Developer who will work with team members
to troubleshoot and improve current back-end applications and processes.
Focused on building a better, more efficient program and creating a better
end-user experience.
● Work closely with Frontend developers to integrate new web features into
our application
● Strong understanding of the web development cycle and programming
techniques and tools.
● Strong communication and presentation skills
● Ability to work in a fast-paced environment.
SKILLSET
● Experience with Smart contract development tools
● Strong background in Javascript, Python & Node JS, SQL
● Build new features and products using modern backend tools (Node.js, Mongo,
SQL, GraphQL)
● Hands-on technical exposure in implementing Blockchain technologies
(Ethereum and Hyperledger Familiarity with Hyperledger Fabric and Solidity )
Understanding of Distributed Ledger technology, Blockchain ecosystem and
structure.
● Experience working in an Agile and DevOps environment.
● Knowledge on Mining, Hashing, Elliptic Curve Cryptography(ECC) and P2P
networking Extensive experience with progression of major projects from the
planning stage through to implementation and completion Effective
communicator to all stakeholders and management during project consulting
and analysis. Strong Software development background.
● Experience on Smart contract and Solidity, development tools for Ethereum
(testrpc, geth, Web3, eth_lightwallet, etc.
● Experience in writing smart contracts.
● Good understanding of NFTs and tokens.
● Experience in wallet integration like MetaMask and Coinbase Wallet.
Experience working with decentralized application protocols like DeFi..
Working knowledge of at least one of the Blockchain frameworks such
as Hyperledger Fabric, R3 Corda, Ethereum (Solidity).
● Experience working with large code-bases.
● Proficiency in one or more of the following languages: C++, Go, Solidity,
Rust, Node.js, React.js.
● Strong knowledge of Algorithms and Data Structures.
● Familiarity with Cryptography.
● Familiarity with P2P networks
● Strong knowledge of bitcoin-like blockchains.
● Strong knowledge of concurrency and writing efficient and safe multithreaded
code
● Familiarity with code versioning tools such as Git


Python |
FastAPI / Django Framework |
Database concept, API & SQL's |
SSO, Oauth2, JWT, Microservices |
MVC, ORM |
1) Write effective, scalable code |
2) Develop back-end components to improve responsiveness and overall performance Integrate user-facing elements into applications. |
3) Test and debug programs. |
4) Improve functionality of existing systems. |
5) Implement security and data protection solutions. |
6) Assess and prioritize feature requests. |
7) Coordinate with internal teams to understand user requirements and provide technical solutions |
8) Debugging programs and integrating applications with third-party web services. |


processing nearly 6 million transactions every month. By the end of this year, we will be growing this number to 10 million. The most defining aspects of our work related to — consistency, reliability,scalability and agility. We make use of a wide variety of technologies and process significantly large amounts of data on a daily basis.
We are looking for backend engineers who have an appetite to explore new technologies, while building applications that can scale well both in terms of execution speed and the size of data that is
processed.
You will:
• Work closely with the product management team to understand the scope of an application
• Expected to research for ideal technologies that can work ideally for given problem statements
• Have a good grasp of how to design and implement APIs in conformance to the protocols of REST and GraphQL.
• Need to have a good understanding of network principles related to latency, throughput,bandwidth, security — and how to monitor them.
• Take ownership of the correctness of your work both in terms of functional and usability aspects
• Apply the best practices of software development when it comes to SCM, managing issues and most importantly, documenting your work.
We are looking for someone who has:
• 1+ years of experience in building integration solutions with REST and GraphQL APIs,Databases, email, SMS, etc.
• Familiar with the concepts of distributed systems esp. Queues.
• A sound understanding of disparate persistence systems SQL and NoSQL storage systems.
• Worked with Python on a regular basis and is conversant with the dominant frameworks like
Django, Flask and those required to implement RESTful/GraphQL protocols.
• A strong understanding of data structures.
• The ability to communicate results clearly in a verbal and written manner
Nice to haves:
• Experience in a high growth technology company
• Conversant with the AWS platform and have a good understanding of working remotely on servers using SSH and CLI.
• Can install and operate infrastructure applications which can be used to monitor performance, alert and recover.


Job Description:
We are looking for a Python Web 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, ensuring high performance and responsiveness to requests from the front-end. You will also be responsible for integrating the front-end elements built by your co-workers into the application; therefore, a basic understanding of front-end technologies is necessary as well.
Responsibilities:
- Writing reusable, testable and efficient code.
- Design and implementation of low-latency, high-availability, and performant applications.
- Integration of user-facing elements developed by front-end developers with server side logic.
- Implementation of security and data protection.
- Integration of data storage solutions (may include databases, key-value stores, blob stores, etc.)
Skills And Qualifications:
- Expert in Python, with knowledge of at least one Python web framework (such as Django, Flask, etc depending on your technology stack).
- Familiarity with some ORM (Object Relational Mapper) libraries.
- Able to integrate multiple data sources and databases into one system.
- Understanding of the threading limitations of Python, and multi-process architecture.
- Good understanding of server-side templating languages.
- Basic understanding of front-end technologies, such as JavaScript, HTML5, and CSS3.
- Understanding of accessibility and security compliance (depending on the specific project).
- Knowledge of user authentication and authorization between multiple systems, servers and environments.
- Understanding of fundamental design principles behind a scalable application.
- Familiarity with event-driven programming in Python.
- Understanding of the differences between multiple delivery platforms, such as mobile vs desktop, and optimizing output to match the specific platform.
- Able to create database schemas that represent and support business processes.
- Strong unit test and debugging skills.





