You will get Node.js Backend Debugging & Bug Fixes
Project details
I will investigate and fix bugs in your Node.js/TypeScript backend. I have 4+ years of commercial backend development experience and work with REST APIs, databases, authentication, background jobs, Redis, Docker, and third-party integrations.
My approach is to reproduce the issue where possible, trace the relevant execution flow, identify the root cause, implement the fix, and verify the result.
I can help with API errors, authentication issues, database problems, background job processing, configuration issues, integrations, and other backend-related bugs.
I work with existing codebases and focus on clean fixes that fit the project's existing architecture rather than temporary workarounds.
Before ordering, please provide a description of the issue and any relevant logs or steps to reproduce it. This helps me determine the appropriate package and scope of work.
My approach is to reproduce the issue where possible, trace the relevant execution flow, identify the root cause, implement the fix, and verify the result.
I can help with API errors, authentication issues, database problems, background job processing, configuration issues, integrations, and other backend-related bugs.
I work with existing codebases and focus on clean fixes that fit the project's existing architecture rather than temporary workarounds.
Before ordering, please provide a description of the issue and any relevant logs or steps to reproduce it. This helps me determine the appropriate package and scope of work.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included
| Service Tiers |
Starter
$30
|
Standard
$80
|
Advanced
$180
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 2 | 2 |
Bug Investigation | |||
Fix Documentation | - | - | |
Detailed Code Comments | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$25
Additional bug fix
(+ 1 Day)
+$30Frequently asked questions
About Dmytro
Node.js & Full-Stack Developer | AWS
Kharkiv, Ukraine - 2:35 am local time
AWS Certified Developer – Associate
I have worked on products across e-commerce, fitness, EdTech, healthcare, and enterprise software. My responsibilities ranged from implementing backend features to owning large parts of backend development, designing architecture, integrating third-party services, processing external data formats, and implementing complex business logic.
Multi-Marketplace E-commerce Platform
Worked on a platform that allowed merchants to manage and publish products across multiple marketplaces from one application. I was responsible for a significant part of the backend, including REST APIs, business logic, database operations, marketplace integrations, product synchronization, asynchronous processing, and handling external API errors.
Fitness Mobile Application
Developed backend functionality for a mobile fitness application, including APIs, business logic, user and workout-related data, database operations, and mobile-app integrations.
Language Learning Platform
Contributed to the backend of an EdTech platform for learning foreign languages, working on REST APIs, database logic, application features, and communication between frontend and backend services.
Healthcare & Biometrics Platform
Worked on a large healthcare platform involving laboratory testing, biometric data, external medical services, authentication, and e-commerce.
Key responsibilities included:
Processing and parsing HL7 laboratory results and automatically linking them to user profiles
Implementing two-factor authentication with mobile authenticator confirmation
Integrating a third-party service for skin-condition analysis from user photos
Shopify integration for purchasing laboratory tests and related products
Developing REST APIs, backend business logic, database operations, and integrations around users, tests, results, and biometric data
Conference & Employee Certification Platform
Worked on a large platform for organizing conferences and managing professional certification workflows.
One of my major responsibilities was designing and implementing backend architecture for real-time chat using AWS services and WebSockets. This included connection management, WebSocket event processing, integration with backend services, and event-driven communication. I also developed financial and accounting functionality, including: subscription expense tracking, accounting for purchased products, financial calculations based on system transactions, backend logic around payments, subscriptions, purchases, and expenses.
What I can help with:
Node.js, TypeScript, REST APIs, NestJS, Express.js, Fastify, PostgreSQL, MySQL, MongoDB, Prisma, Sequelize, AWS Lambda, API Gateway, S3, CloudFront, SNS, SQS, Redis, WebSockets, third-party integrations, authentication, complex business logic, performance optimization, debugging, and automated testing.
I am comfortable joining an existing codebase, understanding complex business requirements, designing solutions, and taking backend features from implementation to production.
Due to NDAs, I cannot publicly share source code or confidential product details, but I can discuss the technical challenges, architecture, technologies, and responsibilities involved.
Technical Skills
Languages:
JavaScript, TypeScript
Frontend:
React, Next.js
Backend:
Node.js, Express.js, NestJS
ORM:
Prisma, Sequelize, TypeORM
Databases:
PostgreSQL, MySQL, MongoDB
Cloud:
AWS (Lambda, API Gateway, S3, CloudFront, RDS, SNS, SQS, IAM)
Tools:
Git, Jira
Professional Skills
- Strong problem-solving skills
- Result-oriented
- Fast learner
- Responsible and self-motivated
- Good communication skills
- Attention to detail
- Clean and maintainable code
Education
National Aerospace University "Kharkiv Aviation Institute"
Master's Degree in Computer Science
Faculty of Aircraft Control Systems
Department of Information Systems and Technologies
Graduated: 2021
Kharkiv Radio Technical College
Computer Engineering
Graduated: 2017
Languages
Ukrainian — Native
English — Upper-Intermediate (B2)
About Me
I am a Backend Developer who enjoys solving challenging problems and building reliable, scalable applications. I continuously improve my skills, learn modern technologies, and always strive to deliver high-quality solutions on time. I value clear communication, responsibility, and long-term cooperation with clients.
Steps for completing your project
After purchasing the project, send requirements so Dmytro can start the project.
Delivery time starts when Dmytro receives requirements from you.
Dmytro works on your project following the steps below.
Revisions may occur after the delivery date.
Review the issue
Review the provided information, reproduce the issue where possible, and identify the relevant part of the backend.
Investigate the root cause
Trace the relevant code and execution flow to identify the root cause of the issue.