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Backend & Cloud
Database Architecture & Optimization

Database Design, Optimization & Migration Services - High-Performance Database
Architecture & Optimization

We design, tune, and migrate PostgreSQL, MongoDB, Redis, and vector databases delivering sub-5ms query performance, rock-solid data integrity, and zero-downtime live migrations.
250+Databases Architected
sub-5msAverage Query Latency
99.999%Data Durability
Since2019
Core Capabilities

Enterprise Database Engineering Services

From relational database schema design to Redis caching and zero-downtime live migrations.

Relational DB Architecture

PostgreSQL & MySQL 3NF schema design, indexing, foreign keys, partitioning, and read replicas.

NoSQL & Document Stores

MongoDB, DynamoDB, and Firebase NoSQL document schema modeling tuned for fast horizontal scaling.

In-Memory Caching (Redis)

Redis cache clusters, session management, rate-limiting counters, and real-time Pub/Sub message buses.

Vector DBs for AI & Search

pgvector, Pinecone, and Qdrant integration for storing high-dimensional embeddings and AI semantic search.

Zero-Downtime DB Migrations

Seamless database refactoring, live CDC data replication, and zero-downtime database upgrades.

Query Optimization & Tuning

EXPLAIN ANALYZE query profiling, index optimization, connection pooling with PgBouncer, and deadlock fixes.

Why Choose Mind Stack Labs

Sub-5ms Speed. 100% Data Integrity.

Proper database design and index tuning can reduce your cloud spending while boosting application speed tenfold.

Why Expert Database Engineering Matters?

  • Sub-5ms query response times even under heavy concurrent traffic
  • Strict ACID compliance and multi-region data replication for zero data loss
  • Automated daily backups, point-in-time recovery (PITR) & encryption at rest
  • Integrated vector database capabilities for AI LLM semantic search
  • Reduced monthly cloud database spending through index and query optimization
  • Zero-downtime database schema migration workflows
Certified PostgreSQL & MongoDB database administrators
250+ production database clusters architected
Zero-downtime ETL & database replication experts
Dedicated database lead assigned to your infrastructure
Version-controlled SQL migration scripts & Prisma / TypeORM
Complete data privacy, HIPAA & SOC2 compliance readiness
PgBouncer connection pooling & multi-region read replicas
Free 30-day post-migration database monitoring included
Industry Expertise

Industries We Serve

Building high-availability relational, NoSQL, and vector database architectures for mission-critical apps.

FinTech & Banking

ACID Financial Ledgers & Auditing

E-Commerce

High-Volume Catalog & Inventory

HealthTech & Bio

Encrypted Patient Data Repositories

SaaS Platforms

Multi-Tenant Data Partitioning

Logistics

PostGIS Spatial & Location Queries

AI & LLM Products

pgvector Vector Similarity Search

What We Architect
Database Solutions

Database Solutions We Deliver

From PostgreSQL schema design to Redis cluster caching and zero-downtime migrations.

PostgreSQL Database Architecture
PostgreSQL Enterprise01

PostgreSQL Database Architecture

Custom relational schemas with B-tree & GIN indexing, partition tables, PgBouncer connection pooling, and read replicas.

Workflow Chain
Schema Design→GIN/B-Tree Indexes→PgBouncer→Read Replicas
MongoDB & Document Databases
NoSQL Cluster02

MongoDB & Document Databases

Document database modeling with MongoDB replica sets, sharding for horizontal scale, and aggregation pipeline tuning.

Workflow Chain
Document Model→Shard Keys→Aggregation Specs→Atlas Backup
Redis Cluster & Cache Infrastructure
In-Memory Speed03

Redis Cluster & Cache Infrastructure

High-speed Redis cache layers to eliminate redundant database reads, manage user sessions, and power live leaderboards.

Workflow Chain
Cache Strategy→Session Store→Pub/Sub Bus→Redis Sentinel
pgvector & Vector Database Setup
Vector AI DB04

pgvector & Vector Database Setup

Integrate vector embeddings into PostgreSQL with pgvector or dedicated vector stores like Pinecone and Qdrant.

Workflow Chain
Embeddings Store→HNSW Index→Cosine Distance→Fast RAG Search
Zero-Downtime Database Migration
Live Migration05

Zero-Downtime Database Migration

Migrate legacy databases (e.g. MySQL to Postgres or MongoDB to Postgres) using CDC replication with zero user interruption.

Workflow Chain
CDC Setup→Schema Mapping→Dual Writing→Zero Downtime Cutover
Query Tuning & Cost Optimization
Performance Audit06

Query Tuning & Cost Optimization

Identify slow queries using EXPLAIN ANALYZE, fix missing indexes, optimize memory buffers, and slash cloud DB costs.

Workflow Chain
Slow Query Log→EXPLAIN Profiling→Index Addition→Cloud Cost Slash
Technologies

Database Tech Stack

Industry-leading SQL, NoSQL, and vector database engines.

PostgreSQLPostgreSQL
MongoDBMongoDB
RedisRedis
MySQLMySQL
PrismaPrisma
DockerDocker
SupabaseSupabase
Amazon RDSAmazon RDS
Our 4-Step Engineering Process

From Audit to Tuned Production Cluster

Phase 01

Data Audit & Profiling

Analyze existing schemas, query patterns & bottlenecks.

Slow Query LogsSchema AuditCapacity Forecast
Phase 02

Schema & Index Design

Architect 3NF or NoSQL schemas, index plans & connection pools.

ERD BlueprintIndex StrategyPool Setup
Phase 03

Optimization & Migration

Refactor slow queries, run CDC replication & verify integrity.

EXPLAIN ProfilingCDC MigrationData Verification
Phase 04

Deploy & Monitoring

Deploy tuned database, configure automated backups & alert guards.

Prometheus MetricsPITR Backups24/7 Monitoring
Advanced
Database Engineering

Advanced Database Architectural Capabilities

From connection pooling and multi-region read replicas to pgvector AI search and zero-downtime CDC replication.

Flagship FeaturePostgreSQL PgBouncer

PgBouncer Connection Pooling & Read Scaling

Deploy PgBouncer transaction-level connection pooling alongside read-replicas to prevent connection bottlenecks and scale read query throughput effortlessly.

AI Vector Enginepgvector & HNSW Indexes

PostgreSQL Vector Embeddings & RAG Search

Store text and image vector embeddings inside PostgreSQL using pgvector, tuning HNSW indexes to execute sub-10ms similarity searches for LLM applications.

Zero DowntimeCDC Live Sync

Change Data Capture (CDC) Zero-Downtime Migration

Stream live WAL database modifications between legacy and target databases using Debezium and Kafka, allowing seamless cutover without taking your app offline.

EXPLAIN ANALYZEQuery Profiling

Automated Query Tuning & Cost Reduction

Identify sequential table scans, missing indexes, and un-optimized JOINs with pg_stat_statements, turning slow 2-second queries into sub-5ms lookups.

FAQ

Database Solutions Database Design, Optimization & Migration Services Questions

Have questions about database optimization, migrations, or vector search? Speak with our lead database engineer.

Book a free technical consultation
Rapid Response

We reply to all database enquiries within 24 hours.

Start Your Project

Should we use PostgreSQL or MongoDB for our project?

PostgreSQL is ideal for structured data requiring strict relational integrity (ACID), financial records, and complex joins. MongoDB is great for flexible, rapidly changing document structures and high-speed write workloads.

How do you achieve zero-downtime database migrations?

We use Change Data Capture (CDC) and dual-writing techniques. The new database is continuously synchronized with live traffic before a seamless cutover, ensuring no downtime or lost transactions.

What is pgvector and why use it for AI applications?

pgvector is a PostgreSQL extension that enables vector similarity search (such as HNSW and cosine distance) directly inside your existing relational database, eliminating the need to manage a separate vector database.

How can you help reduce our cloud database bills?

We optimize missing indexes, tune slow queries, configure connection pooling (PgBouncer), and implement Redis caching to dramatically lower CPU and memory utilization on cloud instances.
Verified Client Reviews
Verified Reviews

Client Experiences That Speak for Themselves

Real experiences from clients who worked with us to turn ideas into production products.

Mike Pettigrew

Mike Pettigrew

Ireland

Trustpilot

“Ziyad and the entire Codex Lancers team have been simply amazing to work with while creating our 11:11 The Divine Mindset mobile app. Communication was outstanding throughout the entire project. They kept us fully informed at every stage, responded quickly, and were always patient, professional and genuinely committed to achieving the best possible result. Their feedback, ideas and suggestions were enormously helpful and significantly improved the finished app. The app they have created is stunningly beautiful in every way, with an elegant, polished design and flawless functionality. They understood our vision perfectly and brought it to life even better than we had imagined. I cannot recommend Ziyad and his team highly enough. Their technical expertise, creativity, attention to detail and dedication are exceptional. We will be using them for all our future app projects and look forward to working with them for many years to come.”

Dan Brown

Dan Brown

Finland

Trustpilot

“I’ve been building with Codelancer (Ziyad and the team) for the past plus two years, and I highly recommend them to anyone in need of a reliable development team. They are deeply committed to their clients’ vision, communicate clearly, are impressively responsive, and have consistently turned complex ideas into fully functional products. Codelancer genuinely prioritizes client success. They don’t just write code -they share valuable insights, make thoughtful suggestions, and support you at every stage of the journey. Over time, they’ve become an integral part of our team, and it’s a real pleasure to work with them and have them by our side. I am very grateful to work with them and highly recommend them to all”

Gabe Hizer

Gabe Hizer

Mexico

Trustpilot

“Great communication, excellent coding work, very open to making changes as the projects have developed. My project involved several different computer languages, for Windows, Mac, iOs, and Android. It was great that they had sufficient talent in their team to pull it all together! I have been working with them for the last almost 3 years.”

NL

Nick Lavars

Australia

Trustpilot

“Partnering with CodeX Lancers has been one of the best decisions for our project. From the initial UI/UX flow design to API implementation and complete end-to-end product guidance, their team consistently demonstrated strong product thinking. They don’t just execute tasks they ask the right questions, provide thoughtful suggestions, and help refine the overall direction of the product. Their involvement went far beyond development. They contributed strategic insights, improved workflows, and ensured that both the user experience and backend integrations were properly aligned. That level of ownership truly makes a difference. Timelines were respected, communication was clear and consistent, and every discussion felt productive and solution-focused. Instead of working with an external agency, it genuinely felt like we had added a committed product team to our side. Their attention to detail, UI clarity, structured approach, and proactive mindset gave us confidence throughout the entire journey. Highly recommended for anyone looking for a dependable team that genuinely cares about both execution and long-term product success.”

Eric Verdi

Eric Verdi

United States

Trustpilot
MC

Mark Chawke

Toronto, Canada

Clutch

“Thanks to CodeX Lancers, the paywall feature was successfully implemented. The client’s notification system was also fixed, and the error-free app was launched. The team managed the engagement well and communicated excellently with the client. They were flexible and delivered great results.”

NT

Neadom Tucker

United States

Clutch

“CodeX Lancers launched the app in the Google and Apple Play Store without errors. The team was knowledgeable about the .NET platform in its first version and completed all tasks on time.”

AK

Anup Kumar

Bengaluru, India

Clutch

“Thanks to CodeX Lancers efforts, the client has received the requested mobile app. The team provides timely deliverables, communicates excellently, and maintains accurate timesheets to verify progress daily. CodeX Lancers responsiveness and commitment have been hallmarks of their performance.”

ZM

Zainab Mithwani

United Kingdom

Clutch

“CodeX Lancers successfully delivered each project phase on time and with high quality. The team provided consistent updates throughout the project and communicated primarily through virtual meetings. Their teamwork impressed the client, resulting in a positive engagement.”

KH

Kamal Hassan

Riyadh, Saudi Arabia

Clutch

“CodeX Lancer has delivered a bug-free app published seamlessly in the Apple store. The team has managed the project excellently and communicated well through virtual meetings and email. Overall, working with CodeX Lancers has brought positive results.”

OP

Opendoor Parenting

Client Partner

Upwork

“I had a great experience working with Ziya. From the very beginning, communication was clear, professional, and consistent. He quickly understood the requirements and translated them into a high-quality working solution. What stood out most was his reliability and attention to detail. Everything was delivered on time, and any feedback or adjustments I requested were handled quickly and smoothly. He was proactive when needed and always available to explain technical aspects clearly. Overall, the collaboration was efficient, smooth, and results-driven. I highly recommend Ziya to anyone looking for a skilled and dependable developer, and I would definitely work with him again.”

LA

lawpoint

Client Partner

Upwork

“Ziya contributed to the project and was generally responsive when contacted. The engagement required additional coordination and clarification on some tasks, and timelines were somewhat longer than expected. Overall, a cooperative developer with potential, particularly if project scope and deliverables are very clearly defined from the beginning.”

LA

Luqta App

Client Partner

Upwork

“Delivered consistent results on our FlutterFlow project, driving steady progress and meeting objectives efficiently. Always helpful and proactive, with a strong can-do attitude toward tasks and execution. Collaboration with the backend team and other stakeholders was smooth and effective, contributing to strong alignment and improved overall project outcomes. We have been working with Ziya and his team on three major milestones, and overall, it has been a productive collaboration. The team demonstrated strong technical skills, responsiveness, and a commitment to delivering quality work. Design & Implementation – The team effectively translated our requirements into a visually appealing and functional UI, ensuring a smooth user experience. Timely Delivery – Most tasks were completed on time, and any delays were well-communicated in advance. Before we finished our current project we started to send them more projects.”

WF

What's for Dinner

United States

Upwork

“Ziya was incredible to work with on my project. Came to the job with clear directions and clear understanding of what I was looking for. Brought ideas to the table that I didn't think about. Excellent communication. Wonderful project knowledge and was very helpful in explaining a process that I know little about. Would definitely use again!”

YA

Yoda App

Client Partner

Upwork

“Ziya delivered our field data collection app for 70+ users on time and bug-free. His Flutter/Dart expertise is solid, and he proactively solved complex challenges including offline sync and GPS tracking without being asked. What impressed me most: clear daily communication, clean code that's easy to maintain, and thoughtful suggestions that improved our original design. When integration issues arose, he fixed them independently rather than just reporting problems. Would definitely hire again and recommend to others needing reliable Flutter development.”

Recognized & Verified Across Major Industry Platforms
Google
Google
5.0
Clutch
Clutch
5.0
Upwork
Upwork
Top Rated+
Trustpilot
Trustpilot
5.0
Ready to Optimize?
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Response within 24 hours
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