Software Engineer

Customized Energy Solutions India Pvt. Ltd. (CES India) is part of Customized Energy Solutions (CES), a globally recognized, privately held energy market intelligence, consulting, and operational services firm supporting retail and wholesale electricity and natural gas markets worldwide.

Headquartered in Philadelphia, CES operates across the United States, Canada, Japan, India, and Vietnam, with approximately 400 associates globally. The company has earned multiple distinctions from INC. 500 | 5000 and the Philadelphia Business Journal, including Hall of Fame status and repeated recognition as a Best Place to Work.

Established in 2010, CES India plays a critical role in supporting both domestic and international energy initiatives. The India team brings expertise in emerging technologies transforming the energy landscape, including energy storage, electric mobility, wholesale electricity markets, microgrids, and renewable energy systems. Associates in India collaborate closely with global teams while contributing deep technical and analytical capabilities to complex energy market challenges.

CES India actively engages with industry bodies and ecosystem partners that are shaping India’s energy and technology landscape, including organizations such IESA. Through industry collaboration, technology innovation, and engagement with public and private stakeholders, CES India supports the broader goal of advancing sustainable, high-growth energy and manufacturing sectors in India.

At CES India, you will work in a fast-evolving industry where innovation, accountability, and professional growth are valued. Your work will contribute to meaningful outcomes across both regional and global energy markets.

We are seeking a skilled and proactive Backend Python Developer with 3-5 years of experience in backend development. The ideal candidate will have strong hands-on experience with Python, Django/FastAPI, REST APIs, cloud-native AWS services, and database technologies. The candidate will be responsible for designing, developing, and maintaining scalable backend applications while ensuring high performance, reliability, and code quality. This role requires strong problem-solving skills, experience with modern backend architectures, and the ability to collaborate effectively with cross-functional teams in a fast paced product development environment.

Role & Responsibilities

Backend Development

• Design, develop, and maintain scalable backend applications using Python
• Build and maintain RESTful APIs using Django and/or FastAPI
• Develop clean, maintainable, and efficient code following software engineering best practices
• Design and implement backend services with a focus on performance, scalability, and security
• Participate in code reviews and contribute to improving development standards

Database & Data Management

• Design and optimize MongoDB collections, queries, aggregations, and complex pipelines
• Work with SQL for relational data modeling and query optimization
• Analyze database performance and implement improvements where required
• Ensure efficient data handling and storage solutions

Cloud and infrastructure

• Develop and deploy cloud-native applications using AWS services
• Build and maintain containerized applications using Docker
• Deploy and manage applications on AWS ECS/ECR using AWS Copilot
• Develop serverless solutions using AWS Lambda, Step Functions, API Gateway, S3, IAM, CloudWatch etc.
• Implement infrastructure as code using Terraform
• Develop application infrastructure and Monitor application performance and troubleshoot cloud-based issues

Monitoring & Optimization

• Troubleshoot production issues and ensure application reliability
• Analyze logs, identify performance bottlenecks, and implement improvements
• Contribute to application monitoring and operational excellence

Collaboration & Delivery

• Collaborate with frontend developers, QA engineers, product owners, and stakeholders
• Participate in Agile development processes and team discussions
• Contribute to CI/CD pipelines and automate deployment workflows
• Ensure timely delivery of high-quality software solutions

• 3-5 years of experience in backend development
• Strong proficiency in Python as the primary programming language
• Hands-on experience with Django and/or FastAPI
• Strong understanding of REST API design and development
• Experience with Elasticsearch, Databricks
• Experience with Git and modern CI/CD practices
• Strong understanding of software design principles, clean code practices, and version control
• Strong debugging, analytical, and problem-solving skills
• Experience working with MongoDB, including aggregation pipelines and performance optimization
• Experience with SQL and SQL query optimization
• Hands-on experience with AWS services including: (Docker, Terraform, AWS Copilot, Lambda, Step Functions, API Gateway, ECS/ECR, S3, CloudWatch, IAM etc.)

Preferred Skillsets

• Experience with python and python frameworks
• Experience with asynchronous programming and background task processing using Celery, asyncio, or similar technologies
• Basic understanding of React and frontend development for effective collaboration
• Experience working in Agile/Scrum environments
• Knowledge of monitoring, logging, and application performance tuning
• Experience building highly scalable and distributed backend systems
• Familiarity with DevOps practices and cloud deployment workflows
• Familiarity with Agile/Scrum methodologies • Exposure to observability and monitoring tools (Datadog, Elastic etc. )

What We’re Looking For

A Backend Python Developer who is passionate about building reliable, scalable, and maintainable software solutions. The ideal candidate should be self-driven, detail-oriented, and comfortable working across multiple technologies. You should take ownership of assigned tasks, proactively identify improvements, and collaborate effectively with cross functional teams to deliver high-quality products

Why Choose CES

Customized Energy Solutions India offers competitive compensation commensurate with experience, along with performance-based incentives aligned to individual and company results. Our benefits are designed to support both professional and personal well-being and include comprehensive medical insurance coverage for associates and eligible dependents, generous paid time off, and structured opportunities for professional development through training programs and skill enhancement initiatives. We are committed to creating an environment where associates are supported, challenged, and positioned for long-term career growth.

Customized Energy Solutions provides equal employment opportunities to all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.