[Hiring] Senior Database Engineer @CITA LABS

Role Description

As a Senior Database Engineer at CITA Lab, you will be responsible for designing and maintaining high-performance, highly available, and reliable database systems supporting blockchain, cryptocurrency, and financial applications.

• Design and maintain scalable database architectures for crypto exchanges, wallets, payment systems, and other financial applications.
• Design highly available and fault-tolerant database infrastructure suitable for production-critical systems.
• Optimize complex SQL queries, indexes, schemas, and execution plans for high-volume workloads.
• Diagnose and resolve database performance bottlenecks in production environments.
• Design reliable data models for financial transactions, balances, ledgers, deposits, withdrawals, and blockchain-related data.
• Ensure strong transactional integrity and consistency across distributed systems.
• Develop strategies for replication, partitioning, sharding, clustering, and horizontal scaling.
• Design and maintain database backup, restore, disaster-recovery, and point-in-time recovery strategies.
• Implement database monitoring, alerting, capacity planning, and performance analysis.
• Work closely with backend engineers on transaction boundaries, locking strategies, concurrency control, and efficient database access patterns.
• Design safe database migration and schema-evolution strategies with minimal or zero production downtime.
• Identify and resolve deadlocks, lock contention, replication lag, slow queries, connection exhaustion, and other production database issues.
• Participate in architecture reviews and provide guidance on database technology selection.
• Establish database security best practices, including access control, encryption, auditing, secrets management, and least-privilege policies.
• Participate in incident response, root-cause analysis, and post-incident improvements.
• Review database-related code and mentor engineers on database design and performance best practices.

Qualifications

• 7+ years of professional experience in database engineering, backend infrastructure, DBA, or related roles.
• Strong production experience with relational databases, particularly PostgreSQL and/or MySQL.
• Deep understanding of SQL optimization, indexing strategies, query execution plans, and database internals.
• Strong knowledge of ACID transactions, isolation levels, MVCC, locking, deadlocks, and concurrency control.
• Experience designing databases for high-throughput transactional systems.
• Hands-on experience with replication, high availability, failover, backup, and disaster recovery.
• Experience designing and executing large-scale database migrations with minimal downtime.
• Strong understanding of database monitoring and production troubleshooting.
• Experience operating databases in cloud environments such as AWS, GCP, or Azure.
• Familiarity with infrastructure automation and modern DevOps practices.
• Strong understanding of database security and access-control principles.
• Ability to investigate complex production issues independently.
• Strong communication skills and ability to collaborate with distributed engineering teams.

Requirements

• Nice-to-have: Cryptocurrency exchanges
• Nice-to-have: Blockchain infrastructure
• Nice-to-have: FinTech or payment platforms
• Nice-to-have: Banking or financial systems
• Nice-to-have: Trading platforms
• Nice-to-have: Wallet or custody systems
• Nice-to-have: High-frequency or high-volume transactional systems
• Nice-to-have: Financial ledger systems

Company Description

Founded in Singapore in April 2026, CITA Lab is a dynamic software development startup dedicated to building high-quality, custom blockchain-related products tailored specifically to our customers' requirements.

• Diverse product lineup includes centralized/decentralized cryptocurrency exchange solutions, secure crypto wallets, smart contracts, dApps, and more.
• We turn complex blockchain capabilities into seamless, secure, and intuitive user experiences for clients worldwide.