Backend Engineer

nan; West Bengal; On-site; INR 305,000 - 365,000; Full time

Benefits offered by this job

Competitive salary

6-day working week

Paid overtime

Work-life balance

Collaborative environment

Opportunity to work on real-world AI/S

SaaS and multi-tenant backends

Job summary

Unknown is seeking a Backend Engineer to join its growing tech team. The role focuses on building scalable Python/FastAPI backend services, REST APIs, and PostgreSQL databases for a food-ordering and AI-powered video processing platform.

Responsibilities include authentication, asynchronous processing with Celery/Redis, third-party integrations, and cloud storage. Strong emphasis on testing (Pytest) and collaboration with cross-functional teams onsite in India.

Qualifications

• 3+ years backend development experience.
• Strong knowledge of Python and FastAPI.
• Experience with PostgreSQL and SQL.
• Experience with Redis and asynchronous processing.
• Experience with Celery, RabbitMQ, Kafka, or similar queue systems.
• Knowledge of authentication, authorization, OAuth/JWT, and API security.
• Experience with Docker and Linux.
• Git/GitHub or GitLab proficiency.
• Familiarity with cloud platforms (AWS/Azure/Google Cloud).
• Experience writing automated tests with Pytest.

Responsibilities

• Design, develop, and maintain scalable backend applications using Python and FastAPI.
• Build and maintain REST APIs for web and mobile applications.
• Design and manage PostgreSQL databases including schemas and queries.
• Implement authentication and secure API access.
• Develop asynchronous background-processing systems (Celery/Redis).
• Integrate third-party APIs, webhooks, and payment gateways.
• Develop backend infrastructure for multi-user SaaS.
• Work with AI/ML and video-processing workflows where required.
• Write unit and integration tests with Pytest.
• Collaborate with AI/ML engineers, frontend, DevOps, and QA.

Skills

Python

FastAPI

REST APIs

PostgreSQL

Redis

Celery

Docker

Linux

Git

Cloud platforms

Pytest

OAuth/JWT

Kubernetes

CI/CD

Webhooks

RabbitMQ

Kafka

S3-compatible storage

API Security

Tools

RabbitMQ

Kafka

Docker

Linux

GitHub/GitLab

AWS/Azure/GCP

S3 storage

FFmpeg

Job description

Backend Engineer

We are looking for a skilled and motivated **Backend Engineer** to join our growing technology team. You will work on the backend systems powering our upcoming products, including a **food-ordering platform** and an **AI-powered video processing and clipping platform**.

The ideal candidate should be comfortable building scalable APIs, working with databases and background processing systems, integrating third-party services, and developing reliable production-ready software.

Role & Responsibilities

• Design, develop, and maintain scalable backend applications using **Python and FastAPI**.
• Build and maintain REST APIs for web and mobile applications.
• Design and manage **PostgreSQL databases**, including schemas, relationships, indexes, and queries.
• Implement authentication, authorization, user roles, and secure API access.
• Develop asynchronous background-processing systems using **Celery, Redis, or similar technologies**.
• Build reliable job queues for long-running tasks such as AI processing, video processing, notifications, and other automated workflows.
• Integrate third-party APIs, webhooks, payment gateways, and external services.
• Develop backend infrastructure for multi-user SaaS applications.
• Work with large file and video-processing workflows where required.
• Build APIs and services that communicate with AI/ML and video-processing workers.
• Implement proper error handling, logging, retries, validation, and monitoring.
• Optimize backend performance, database queries, and API response times.
• Implement secure file uploads, storage, and access systems.
• Work with cloud storage and services such as S3-compatible object storage.
• Write clean, maintainable, modular, and well-documented code.
• Write unit and integration tests using **Pytest**.
• Participate in code reviews and maintain development standards using Git.
• Work closely with **AI/ML engineers, frontend developers, Flutter developers, DevOps engineers, and QA engineers**.
• Troubleshoot and resolve production issues.
• Help design the technical architecture as the products scale.

Preferred Candidate Profile

• 3+ years of professional backend development experience.
• Strong knowledge of **Python**.
• Strong experience with **FastAPI**, Django, or similar backend frameworks.
• Strong understanding of REST APIs and backend architecture.
• Good knowledge of **PostgreSQL and SQL**.
• Experience with **Redis** and asynchronous processing.
• Experience with **Celery, RabbitMQ, Kafka, or similar queue systems**.
• Good understanding of authentication, authorization, JWT, OAuth, and API security.
• Experience with Docker and Linux.
• Strong Git/GitHub or GitLab experience.
• Experience building and integrating third-party APIs and webhooks.
• Understanding of database optimization, indexing, transactions, and query optimization.
• Experience writing automated tests with Pytest or similar frameworks.
• Understanding of cloud platforms such as AWS, Azure, or Google Cloud.
• Ability to design modular and scalable backend systems.
• Strong debugging and problem‑solving abilities.
• Good communication and teamwork skills.
• Ability to work independently and take ownership of assigned features.

Additional Advantages

Candidates with experience in any of the following will have an advantage:

• SaaS application development
• Multi-tenant architecture
• AI/ML application backends
• PyTorch inference systems
• GPU processing workflows
• FFmpeg/video-processing systems
• Large file/video uploads
• S3 or S3-compatible storage
• YouTube, Twitch, Kick, or other media APIs
• WebSockets
• Payment gateway integrations
• Subscription and billing systems
• Kubernetes
• CI/CD
• Prometheus, Grafana, or Sentry
• Distributed systems
• Event-driven architecture

Perks & Benefits

• **Competitive salary** based on skills and experience.
• **6-day working week**.
• **Paid overtime** for additional working hours.
• Clear compensation for extra work beyond regular working hours.
• Healthy and professional **work-life balance**.
• Friendly, respectful, and collaborative working environment.
• Opportunity to work on **real-world AI, SaaS, automation, and marketplace products**.
• Opportunity to work with modern technologies including **Python, FastAPI, PostgreSQL, Redis, Docker, AI/ML, cloud infrastructure, and video-processing systems**.
• Opportunity to take ownership of major technical components of the products.
• Career growth opportunities as the company and engineering team expand.
• Learning and development opportunities.
• Performance-based growth and salary reviews.
• Supportive team culture where engineers can contribute ideas and technical decisions.
• Opportunity to work on products designed for users in international markets.

What We Value

We value **ownership, reliability, clean engineering, continuous learning, teamwork, and problem-solving**.

We are looking for someone who doesn't simply complete assigned tickets, but understands **why the feature is being built, how it should scale, and how it should work reliably in production**.

Pay: From ₹30,000.00 per month

Experience:

• Backend Engineer: 3 years (Preferred)

Work Location: In person