You will get your Node.js bug fixed or performance bottleneck resolved and explained
Project details
Get your Node.js bug fixed properly — root cause found and explained, not patched over with a workaround that breaks again next month. For performance issues: measured, profiled, and optimized, with before/after numbers to prove it.
WHAT YOU GET
• The bug fixed at its root cause, with a clear explanation of what broke and why
• A regression test so the bug stays fixed (Standard+)
• For performance work: profiling-based diagnosis and before/after metrics — measured, not guessed (Advanced)
• Clean, reviewable commits — no mystery changes to your codebase
• A 30-minute walkthrough call available as an add-on
WHY ME
I'm a Senior Software Engineer with 5 years debugging and optimizing real-time backend systems that run 24/7 in production — services processing thousands of events per second, where finding the real root cause fast is the job. I've tuned APIs from multi-second responses down to milliseconds.
Revisions cover the reported issue — new or unrelated bugs are handled via the add-on or a new order.
WHAT YOU GET
• The bug fixed at its root cause, with a clear explanation of what broke and why
• A regression test so the bug stays fixed (Standard+)
• For performance work: profiling-based diagnosis and before/after metrics — measured, not guessed (Advanced)
• Clean, reviewable commits — no mystery changes to your codebase
• A 30-minute walkthrough call available as an add-on
WHY ME
I'm a Senior Software Engineer with 5 years debugging and optimizing real-time backend systems that run 24/7 in production — services processing thousands of events per second, where finding the real root cause fast is the job. I've tuned APIs from multi-second responses down to milliseconds.
Revisions cover the reported issue — new or unrelated bugs are handled via the add-on or a new order.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$150
|
Advanced
$300
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 0 | 1 | 1 |
Bug Investigation | |||
Fix Documentation | - | ||
Detailed Code Comments |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$40 - $100
Additional Revision
+$25
Additional bug fixed
(+ 1 Day)
+$40
30-min call to walk through the fix
+$35Frequently asked questions
About Dat
Senior Node.js/NestJS Developer | Real-Time & Event-Driven Systems
Ho Chi Minh City, Vietnam - 4:54 am local time
For the past 5 years, I've built mission-critical systems for the energy industry: platforms where engineers monitor live drilling operations, and where a delayed event or a bad data write has real-world consequences. That environment taught me to write code that is tested (80%+ coverage as standard), observable, and designed for failure - not just code that works on the happy path.
WHAT I CAN DO FOR YOU
- Design and build REST APIs & microservices with Node.js, NestJS, and TypeScript
- Real-time features: Kafka event streaming, WebSockets - thousands of events/second with sub-second latency
- Database design & optimization (PostgreSQL, MongoDB) for large, consistency-critical datasets
- Full-stack delivery with React or Angular when you need frontend covered too
- Code audits: architecture, performance bottlenecks, and test coverage - delivered as a prioritized, actionable report
RECENT WORK
On a real-time drilling monitoring platform, I built the pipeline that streams rig telemetry (torque, pressure, ROP) from Kafka through WebSockets to live dashboards - thousands of events per second at sub-second latency, with anomaly detection that helps engineers catch dangerous conditions before they escalate - cutting engineers' manual review time by ~30%. The system runs 24/7 in production, where downtime isn't an option.
HOW I WORK
Clear communication, honest estimates, no surprises. I ask questions before writing code, commit in small reviewable chunks, and document what I build. I've led a 5-engineer Scrum team and worked onsite with US-based enterprise teams - comfortable in English, async or on calls, with US timezone overlap available.
If you need a backend that won't fall over when it matters, send me a message - I'll reply with concrete questions about your project.
Technologies: Node.js, NestJS, TypeScript, JavaScript, React, Angular, Express, REST API, Kafka, WebSocket, PostgreSQL, MongoDB, Redis, Docker, Kubernetes, AWS (Lambda, S3, EC2, RDS), Azure, CI/CD, Jest, unit testing, microservices, event-driven architecture, system design, Python, ETL, data pipeline
Steps for completing your project
After purchasing the project, send requirements so Dat can start the project.
Delivery time starts when Dat receives requirements from you.
Dat works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce & diagnose
I reproduce the issue locally, then trace it to the root cause using logs, debugging, and profiling where needed.
Fix & verify
I implement the fix in clean, reviewable commits and verify it against the original reproduction steps.