Hitachi Digital Services
Location: Chennai, Tamil Nadu, India Job ID: R0127537 Date Posted: 2026-04-30 Company Name: HITACHI ENERGY TECHNOLOGY SERVICES PRIVATE LIMITED Profession (Job Category): Engineering & Science Job Schedule: Full time Remote: No Job Description: Design, write, and optimize PostgreSQL queries including: Stored functions Triggers Views Complex joins and window functions High-performance queries Optimize PostgreSQL performance through: Index tuning Query plan analysis Partitioning (when needed) Build backend services using C# .NET and Python , integrating with PostgreSQL. Develop and maintain GraphQL APIs using Hasura connected to PostgreSQL. Apply strong transaction handling, error control, and concurrency management. Build both REST and GraphQL endpoints with proper validations and structured responses. Maintain database schemas, table designs, and relational structures. Troubleshoot issues related to: PostgreSQL performance Hasura metadata or GraphQL behavior Backend API logic Write unit tests, integration tests, and database tests. Document SQL routines, backend logic, and GraphQL schema structures. Qualified individuals with a disability may request a reasonable accommodation if you are unable or limited in your ability to use or access the Hitachi Energy career site as a result of your disability. You may request reasonable accommodations by completing a general inquiry form on our website. Please include your contact information and specific details about your required accommodation to support you during the job application process. This is solely for job seekers with disabilities requiring accessibility assistance or an accommodation in the job application process. Messages left for other purposes will not receive a response.