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You will get Fix incorrect calculations or financial logic in your Node.js app
Project details
If your app handles non-trivial logic and the results are wrong, the issue is rarely cosmetic.
It’s usually a broken assumption, edge case, or timing problem hidden in the code.
I specialize in debugging and fixing these problems in data-heavy and financial systems.
What I do:
Reproduce the issue locally
Identify the root cause (not just symptoms)
Apply a minimal, correct fix
Validate the result with real data
Explain what was broken and why
Good fit if:
Your app handles money, metrics, or complex state
Numbers don’t add up or behave inconsistently
You want correctness, not hacks
Not a good fit if:
You want UI or design changes
You’re unsure what the issue is and can’t provide data
You want new features added during a bug fix
It’s usually a broken assumption, edge case, or timing problem hidden in the code.
I specialize in debugging and fixing these problems in data-heavy and financial systems.
What I do:
Reproduce the issue locally
Identify the root cause (not just symptoms)
Apply a minimal, correct fix
Validate the result with real data
Explain what was broken and why
Good fit if:
Your app handles money, metrics, or complex state
Numbers don’t add up or behave inconsistently
You want correctness, not hacks
Not a good fit if:
You want UI or design changes
You’re unsure what the issue is and can’t provide data
You want new features added during a bug fix
Programming Languages
JavaScriptWhat's included
| Service Tiers |
Starter
$60
|
Standard
$120
|
Advanced
$180
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 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.
Additional Revision
+$30
Extended investigation
(+ 1 Day)
+$40Frequently asked questions
About Gokalp
I fix broken logic, and data integrity issues in Node.js & React apps
Istanbul, Turkey - 2:37 am local time
Most bugs I’m hired to solve aren’t UI issues — they’re logic problems:
numbers not adding up, edge cases breaking analytics, incorrect financial calculations, race conditions, or systems that work “most of the time” until real data hits them.
My background is in building complex, invariant-driven systems rather than simple CRUD apps. I recently built a personal finance and analytics platform from scratch that handles:
• Corporate-action-aware portfolio math (splits, dividends, adjustments)
• Historical FX-correct valuation across multiple currencies
• Cash-flow-aware performance metrics (TWR, CAGR, realized vs unrealized P/L)
• Temporal constraints
• Debt, receivables, and schedule-based cashflow modeling
• Background jobs, idempotent webhooks, and queue-based processing
• Strict user-scoped data isolation and ledger-safe operations
This kind of work forces you to think in terms of invariants, time, and data integrity, not just endpoints and components.
What I’m best at
Debugging broken or incorrect business logic
Fixing calculation errors in financial, crypto, or analytics apps
Refactoring Node.js backends for correctness and maintainability
Making React apps reflect true backend state (not optimistic lies)
Tracing edge cases that only appear with real production data
Turning “it mostly works” systems into reliable ones
Tech stack
Node.js (Express, background jobs, queues, webhooks)
React (state consistency, data-driven UI)
SQL & data modeling
Financial & analytics logic
REST APIs
Server-side automation
I use AI tools as an accelerator, not a crutch — I still reason about the system, validate assumptions, and verify results. The end goal is always correct output, predictable behavior, and explainable logic.
How I work
Reproduce the issue locally (no guessing)
Identify the broken assumption or invariant
Fix the root cause, not the symptom
Verify against edge cases
Leave the codebase cleaner than I found it
I’m a good fit if:
Your app handles money, metrics, or non-trivial state
You care about correctness more than flashy features
You want a developer who thinks before coding
I’m not a good fit for:
Pure UI/landing page work
“Just make it work” hacks
Rushed changes without understanding the system
If you’re stuck on a bug that’s been “almost fixed” a few times already, that’s usually where I help the most.
Steps for completing your project
After purchasing the project, send requirements so Gokalp can start the project.
Delivery time starts when Gokalp receives requirements from you.
Gokalp works on your project following the steps below.
Revisions may occur after the delivery date.
Job Completion
I reproduce the issue, trace the root cause, and apply a correct fix based on real data.