You will get a full API performance audit with fixes delivered
Project details
A slow API costs you users, conversions, and credibility — and "it's slow" is usually a symptom with five possible causes. This audit finds the actual cause and fixes it, rather than guessing.
I profile your endpoints and queries to see exactly where time is being spent, rank the bottlenecks by impact, and then implement the highest-value fixes directly in your codebase. You don't get a list of homework — you get working code and a clear record of what changed and why.
This is the same work I did at Deel, where I cut response times by 95% — from 4 seconds down to under 200ms. The approach transfers: measure honestly, fix what actually moves the needle, and leave you with the visibility to keep it fast.
If you don't have monitoring set up, I'll add basic observability as part of the audit so you can see the improvement and catch regressions later.
I profile your endpoints and queries to see exactly where time is being spent, rank the bottlenecks by impact, and then implement the highest-value fixes directly in your codebase. You don't get a list of homework — you get working code and a clear record of what changed and why.
This is the same work I did at Deel, where I cut response times by 95% — from 4 seconds down to under 200ms. The approach transfers: measure honestly, fix what actually moves the needle, and leave you with the visibility to keep it fast.
If you don't have monitoring set up, I'll add basic observability as part of the audit so you can see the improvement and catch regressions later.
Programming Languages
JavaScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included $800
These options are included with the project scope.
$800
- Delivery Time 3 days
- Number of Revisions 0
Frequently asked questions
About Danilo
Backend Engineer | Distributed Systems, AI Agents, Event-Driven | Node
Skopje, North Macedonia - 4:38 am local time
Currently Senior Backend Engineer at Deel. Here's what that looks like in practice:
→ 95% API latency reduction (4s → <200ms) — found via Datadog, fixed via query profiling
and index optimization
→ 400,000+ invoices/month processed reliably — sharded pipeline with idempotent deduplication
and zero duplicate ingestion
→ MCP-integrated AI workflows replacing thousands of manual contractor uploads — 90% faster
→ 50,000+ active users scaled; $5K/month operating costs cut via e-commerce rebuild
You're in the right place if:
"I need backend engineers who own performance end-to-end, not just write endpoints"
"We're moving toward AI-native architecture and need someone who's already built it"
"Our system works until it doesn't — I want it to just work"
I work best with teams that:
✅ Have real infrastructure challenges, not greenfield toy problems
✅ Value observability and reliability alongside delivery speed
✅ Are building toward scale, not just MVP
Working together, you get:
★ Distributed systems designed for fault tolerance from day one
★ MCP and agentic integrations that make your existing backend 10x more capable
★ Performance investigations backed by real metrics — not guesswork
★ Code your team can maintain without me holding their hand
MY STACK
- Back End: Node.js · TypeScript · GraphQL
- Databases: PostgreSQL · MongoDB · Redis · MySQL
- Messaging: Apache Kafka · WebSocket · event-driven architecture
- AI & Agents: MCP · agentic workflows · Claude API
- Cloud: AWS Lambda · Docker · CI/CD
- Monitoring: Datadog
Drop me a message — I'm happy to look at your architecture and tell you where the biggest
wins are.
Steps for completing your project
After purchasing the project, send requirements so Danilo can start the project.
Delivery time starts when Danilo receives requirements from you.
Danilo works on your project following the steps below.
Revisions may occur after the delivery date.
Set up profiling and observability
I instrument your endpoints and queries, adding basic monitoring if you don't already have it.
Profile every query and endpoint
I trace exactly where response time is going and rank the bottlenecks by impact.