You will get your existing application maintained, updated, and improved.
Project details
I will maintain, update, and improve your existing Next.js, Node.js, or NestJS web application.
I can help with bug fixes, dependency updates, frontend and backend changes, API integrations, database-related tasks, configuration updates, performance improvements, and other maintenance work.
I work with AWS, TypeScript, JavaScript, Next.js, Node.js, NestJS, PostgreSQL, MongoDB, Prisma, REST APIs, Git, Jest, and Cypress.
I focus on understanding the existing codebase first and making targeted changes without unnecessarily rewriting or breaking existing functionality.
This service is intended for existing applications that need ongoing maintenance or specific improvements. For larger or complex tasks, the scope can be discussed before starting the project.
I can help with bug fixes, dependency updates, frontend and backend changes, API integrations, database-related tasks, configuration updates, performance improvements, and other maintenance work.
I work with AWS, TypeScript, JavaScript, Next.js, Node.js, NestJS, PostgreSQL, MongoDB, Prisma, REST APIs, Git, Jest, and Cypress.
I focus on understanding the existing codebase first and making targeted changes without unnecessarily rewriting or breaking existing functionality.
This service is intended for existing applications that need ongoing maintenance or specific improvements. For larger or complex tasks, the scope can be discussed before starting the project.
Programming Languages
HTML & CSS, JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$40
|
Standard
$90
|
Advanced
$180
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 5 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$25 - $40
Maintenanance Plus
(+ 1 Day)
+$30
Dependency Updates
(+ 1 Day)
+$25Frequently asked questions
About Dmytro
Node.js & Full-Stack Developer | AWS
Kharkiv, Ukraine - 9:39 pm 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 project
I will review the existing codebase and requirements to understand the application and identify the changes needed.
Implement the changes
I will make the requested frontend, backend, database, or configuration changes while keeping the existing architecture in mind.