You will get a robust Node.js backend, REST/GraphQL API, or Third-Party Integration
Project details
Need a reliable, secure, and scalable backend for your web or mobile application? I specialize in building custom Node.js/TypeScript backend services, RESTful & GraphQL APIs, and seamless third-party integrations.
Whether you need to connect external services (Stripe, Webhooks, CRMs, OpenAI), fix existing backend performance issues, I deliver clean, production-ready code with strict typing and security in mind.
What I can deliver for you:
• Custom API development (REST / GraphQL / WebSockets)
• Third-party API integrations (Stripe, OpenAI, Telegram Bots, External SaaS)
• Database schema design & optimization (PostgreSQL, Redis, ClickHouse, MongoDB)
• Authentication & Authorization (JWT, OAuth2, RBAC)
• Backend bug fixing, performance optimization, and code refactoring
• Dockerization & Cloud Deployment (AWS, DigitalOcean, Hetzner, Vercel)
Quality & Security Standards:
• Strict TypeScript rules with runtime schema validation (Zod/Joi)
• Automated Postman or Swagger API documentation
• Secure handling of environment variables and secrets
• Production-ready error handling and structured logging
Let's build a fast, stable backend for your app! Live demo: saas.shlykoff.com.
Whether you need to connect external services (Stripe, Webhooks, CRMs, OpenAI), fix existing backend performance issues, I deliver clean, production-ready code with strict typing and security in mind.
What I can deliver for you:
• Custom API development (REST / GraphQL / WebSockets)
• Third-party API integrations (Stripe, OpenAI, Telegram Bots, External SaaS)
• Database schema design & optimization (PostgreSQL, Redis, ClickHouse, MongoDB)
• Authentication & Authorization (JWT, OAuth2, RBAC)
• Backend bug fixing, performance optimization, and code refactoring
• Dockerization & Cloud Deployment (AWS, DigitalOcean, Hetzner, Vercel)
Quality & Security Standards:
• Strict TypeScript rules with runtime schema validation (Zod/Joi)
• Automated Postman or Swagger API documentation
• Secure handling of environment variables and secrets
• Production-ready error handling and structured logging
Let's build a fast, stable backend for your app! Live demo: saas.shlykoff.com.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$450
|
Advanced
$950
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 10 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
+$75 - $300
Additional API Endpoint
(+ 1 Day)
+$75Frequently asked questions
About Vasilii
Full stack Software Engineer
Tbilisi, Georgia - 6:20 am local time
Over the years I've built backend systems, databases, and APIs across a range of setups: REST and GraphQL APIs, microservices and distributed systems, cloud infrastructure, and containerized deployments (Docker). On the frontend, I work primarily with Next.js and Vercel. I also handle two areas that tend to break in production if done carelessly: payment systems (Stripe — Checkout, subscriptions, webhook handling) and database security (PostgreSQL/Supabase Row Level Security, multi-tenant data isolation). More recently I've been adding OpenAI/LLM integrations into existing products for teams adding AI features.
Recent example: I built and shipped a full SaaS application end-to-end — authentication, org-based RLS, Stripe subscriptions, gated features, deployed live — to demonstrate how these pieces fit together in one working product. Demo and source code are in my portfolio below.
Before Upwork, I co-founded and served as CTO at MySoft, leading architecture, technical strategy, and delivery for custom backend systems and infrastructure across multiple industries. I started programming in international ACM competitive programming olympiads, which is where the habit of writing precise, well-tested code came from.
Whether it's a backend API, a database/RLS issue, a broken Stripe integration, a Next.js deployment problem, or wiring an LLM into your product — send me the details and I'll tell you honestly whether I can help and how long it'll take.
Steps for completing your project
After purchasing the project, send requirements so Vasilii can start the project.
Delivery time starts when Vasilii receives requirements from you.
Vasilii works on your project following the steps below.
Revisions may occur after the delivery date.
Technical Review & Architecture Plan
I analyze your technical requirements, review third-party API documentation or existing codebases, and define the database schema and endpoint architecture before writing code.
Environment Setup & Core Infrastructure
I initialize the TypeScript repository with strict linting, set up database connections (Prisma/Drizzle), configure environment validation, and set up core authentication middleware.