Vetted engineers with verified commercial track record in MySQL
Khmelnytskyi, Ukraine
Full-Stack Developer, Fractional CTO — Websites, Apps, Servers, Databases, AI, SEO & QA
Full-stack developer working across the entire stack — websites, apps, servers, databases, AI integrations, SEO, and QA. Languages & Core: writes code in JavaScript, TypeScript, Python, PHP, Go, and Rust. Architects scalable systems for large-scale projects. Frontend & Interfaces: builds websites and web applications with React and Next.js. Crafts responsive interfaces with Tailwind CSS, Radix UI and Shadcn, adds smooth animations with Framer Motion, and interactive charts with Recharts. SEO Audit & On-Page Optimization: semantic keyword research, resolving technical indexing issues, and optimizing page load speeds. Structures page architecture, meta tags, and multi-language support (i18n). Copywriting & Content Strategy: writes technical articles, drafts precise content briefs for writers, and develops content plans. QA & Testing: full-cycle testing for websites, web services, and Android apps — manual QA for UI/UX and business logic, plus automated testing with Jest, Vitest, Playwright and E2E. Backend, Cloud & Databases: complex API integrations of any scale. Builds servers with Node.js (Express, Fastify). Works with PostgreSQL, MySQL and MongoDB, ORMs (Prisma, Drizzle), and cloud infrastructure (Supabase, Firebase, Cloudflare). Browser Extensions & Automation: develops Manifest V3 browser extensions for Chrome, Edge, Firefox and other browsers. Builds web scrapers for complex data extraction using Puppeteer and Playwright. AI & Intelligent Agents: builds custom AI agents and integrates LLMs from OpenAI, Google Gemini, and Anthropic Claude via API, including Claude Code setups. Servers & DevOps: Linux (Ubuntu) and VPS administration — setup, updates, real-time monitoring, secure process isolation, Nginx, PM2, and CI/CD deployment via GitHub Actions. Telegram Bots: develops advanced Telegram bots (Telegraf, Grammy) integrated with AI, payment gateways, Google Sheets, and crypto exchanges. Desktop Applications: builds cross-platform software for Windows and macOS using Electron and Rust. Additional expertise: site development and customization with WordPress and Astro.
PHP Developer
PHP developer with hands-on experience building and maintaining custom web applications and e-commerce back-ends. Comfortable owning a project end-to-end, from database schema to deployment.
When database latency increases or queries start locking production tables, traditional enterprise consulting firms demand multi-thousand dollar diagnostic retainers before conducting a performance audit. Most database bottlenecks do not require a consulting team; they require an experienced DBA who can examine EXPLAIN execution plans and slow query logs.
ProofDevs connects you directly with independent database administrators and performance engineers at clear hourly rates between $50 and $110 per hour, without bureaucratic discovery agreements.
| Engagement Factor | Database Consulting Firm | ProofDevs Independent DBA |
|---|---|---|
| Hourly Billing Rate | $175 – $300 / hr | $50 – $110 / hr |
| Diagnostic Retainer | Mandatory $5,000 – $15,000 upfront | None (pay for diagnostic hours incurred) |
| Incident Response | Ticket triage SLA of 24 – 72 hours | Direct diagnostic access within 2 – 4 hours |
| Access Protocol | Third-party client portal ticketing | Direct access via secure bastion / read-replica |
| Deliverable | Lengthy slide decks and recommendations | Executed indexes, config tuning, and benchmark reports |
MySQL performance issues rarely originate in hardware limitations; they stem from unindexed lookups, improper transaction isolation levels, and lock contention. In high-concurrency systems, multiple write operations on unindexed foreign keys cause table-wide metadata locks or row-level deadlocks.
Senior MySQL engineers diagnose query execution plans using EXPLAIN ANALYZE, evaluating row read-to-return ratios. They design composite B-Tree indexes matching WHERE and ORDER BY clauses, eliminating filesort operations and temporary disk tables.
For massive datasets, specialists execute zero-downtime schema migrations using tools like GitHub's gh-ost or Percona's pt-online-schema-change, avoiding metadata locks on live tables containing millions of rows.
Optimizing MySQL requires tuning InnoDB buffer pools, redo log capacity (`innodb_log_file_size`), and I/O capacity to match workload patterns. In cloud environments like AWS RDS or Google Cloud SQL, specialists configure read replicas and binary logging to eliminate replication lag.
Architecture Rule: The Hidden Cost of SELECT *
Using SELECT * prevents MySQL from utilizing covering indexes (where queries are satisfied entirely from the B-Tree index in memory). Explicitly selecting only required columns allows queries to bypass disk reads entirely, reducing query latency by up to 90%.
Database administration tasks follow structured diagnostic and implementation phases with predictable timelines.
Independent MySQL specialists charge between $50 and $110 per hour. Diagnostic reviews can be performed using anonymized logs, table schemas, and execution plans without granting access to sensitive customer data. Clients maintain absolute control over all database credentials, VPC configurations, and security groups.
You can connect with available database performance specialists within 2 to 4 hours to review logs and stabilize production latency.
Rates range from $50 to $110 per hour, based on expertise in high-concurrency InnoDB tuning, replication, or cloud RDS/Aurora architecture.
Yes. Query profiling, index analysis, and server configuration tuning can be conducted using schema definitions, execution plans, and anonymized logs without access to customer data.
Yes. Specialists regularly manage Amazon RDS, Amazon Aurora, Google Cloud SQL, and self-hosted Linux MySQL clusters.
You receive documented execution plans, added composite indexes, server configuration adjustments, and verified before-and-after query latency benchmarks.
