Back End Developer

Calsoft Japan; Pune District; On-site; INR 2,400,000 - 3,400,000; Full time

Job summary

Calsoft Japan is seeking a hands-on Backend Developer with 7–9 years of experience in Golang and Python to design and build scalable backend systems. You will be actively involved in writing clean, efficient code, designing APIs, and contributing to system architecture for high-performance applications.

The role emphasizes Go and Python, RESTful services, microservices, and strong coding discipline. Collaboration with cross-functional teams, debugging, and performance optimization are core

Qualifications

• 7–9 years of backend development experience.
• Hands-on coding with Go and Python.
• Designing APIs and building scalable backend systems.

Responsibilities

• Design, develop, and maintain robust backend services and APIs.
• Write production-ready code in Golang and Python.
• Build scalable and reliable systems with a focus on performance.
• Collaborate with cross-functional teams to deliver end-to-end solutions.
• Debug, optimize, and improve existing systems.
• Ensure best practices in code quality, testing, and maintainability.

Skills

Golang

Python

Backend

APIs

REST API

Tools

Docker

Kubernetes

Job description

Job Brief: Golang + Python Backend Development

Work Mode

3 days WFO

Interview Process

• Online Test
• L1 Interview
• Client Interview (F2F Mandatory)
• HR Round

Description- Job Title: Backend Developer (Golang + Python)

Role Overview

We are looking for a highly hands-on Backend Developer with 7–9 years of experience in Golang and Python to design and build scalable backend systems. This role requires strong coding expertise, problem-solving skills, and the ability to work on production-grade systems. You will be actively involved in writing clean, efficient code, designing APIs, and contributing to system architecture for high-performance applications.

Key Responsibilities

• Design, develop, and maintain robust backend services and APIs
• Write high-quality, production-ready code in Golang and Python
• Build scalable and reliable systems with a focus on performance and efficiency
• Collaborate with cross-functional teams to deliver end-to-end solutions
• Debug, optimize, and improve existing systems
• Ensure best practices in code quality, testing, and maintainability

Core Technical Requirements - Golang (Primary Focus)

• Strong hands-on experience in Go programming
• Deep understanding of: Goroutines and concurrency patterns Channels and synchronization (mutexes, wait groups, etc.)
• Proven experience in building backend services or microservices using Go
• Strong coding skills with emphasis on: Performance optimization
• Good understanding of REST API design
• Familiarity with gRPC and Prometheus (good to have, not mandatory)
• Hands-on experience with frameworks such as: Django / Django REST Framework Flask FastAPI
• Experience building and maintaining RESTful APIs
• Strong understanding of: Database design (SQL/NoSQL) API security, authentication, and authorization
• Ability to write efficient, scalable backend logic

Additional Skills (Preferred)

• Experience with Docker and Kubernetes
• Exposure to cloud platforms (AWS / Azure / GCP) Understanding of CI/CD pipelines
• Experience with distributed systems and messaging queues
• Familiarity with observability tools (logging, monitoring, tracing)

What We’re Looking:

• For Strong emphasis on hands-on coding and problem solving
• Ability to work in a fast-paced, product-driven environment
• Solid understanding of system design and backend architecture
• Ownership mindset and attention to detail
• Experience 7–9 years of relevant backend development experience
• Demonstrated experience in building and scaling real-world systems