Wissen Technology - Associate Database Developer - PostgreSQL
WISSEN TECHNOLOGY PRIVATE LIMITED
Job Description :Key Responsibilities :- Design, develop, maintain, and optimize PostgreSQL databases in production environments.- Write and optimize complex SQL queries involving joins, aggregations, CTEs, window functions, upserts, and DDL.- Analyze execution plans and systematically troubleshoot slow SQL queries.- Manage database transactions, isolation levels, locking, and Multi-Version Concurrency Control (MVCC).- Design and maintain database tables, keys, constraints, indexes, and partitioning strategies.- Plan and execute data migrations, including bulk and incremental loads, cutovers, and data validation.- Manage database backup and restore processes, including retention policies, point-in-time recovery, and restore testing.- Develop reliable operational scripts and idempotent reconciliation and backfill processes.- Use Python for data loading, automation, and operational scripting.- Monitor database performance and identify opportunities to improve reliability, scalability, and efficiency.Required Skills & Experience :- 5+ years of hands-on PostgreSQL experience in production or production-adjacent environments.- Strong SQL skills, including joins, aggregation, common table expressions (CTEs), window functions, upserts, and DDL.- Experience analyzing execution plans and optimizing slow SQL statements.- Practical understanding of transactions, isolation levels, locking, and MVCC.- Experience with physical database design, including tables, keys, constraints, indexes, and partitioning.- Hands-on experience with data migrations, bulk and incremental loads, cutovers, and data validation.- Practical knowledge of database backup and recovery, retention policies, point-in-time recovery, and restore testing.- Ability to write reliable operational scripts and idempotent reconciliation or backfill processes.- Basic Python experience for data loading and operational automation.Nice to Have :- Experience with schema migration tools such as Alembic, Flyway, or Liquibase.- Experience managing declarative partitioning at scale.- Experience with managed cloud PostgreSQL services.- Experience tuning PostgreSQL statistics, autovacuum, database bloat, and lock contention. (ref:hirist.tech)
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