Custom Software Development & Consulting Company

Upstaff is a strategic alliance between industry leading teams and consultants specializing in FinTech, Retail, Banking, and Blockchain. With a team of over 50 FTE and 2,000+ professionals on the radar, and 10+ years of outstanding service, we are backed by prominent European investors.

Our extensive portfolio includes collaborations with over 50 global service companies, unicorns and dozens of startups. Contact us today to discuss how we can help you unlock the potential of blockchain technology to boost your project.

Trusted by Businesses
Accenture
SpiralScout
Valtech
Unisoft
Diceus
Ciklum
Infopulse
Adidas
Proxet
Accenture
SpiralScout
Valtech
Unisoft
Diceus
Ciklum
Infopulse
Adidas
Proxet

Hire the Upstaff team
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Meet Upstaff Team

Python
Django
Flask
Anthropic
PandasAI
TensorFlow
C#
JavaScript
APScheduler
AsyncIO
Beautiful Soup
Django Channels
Django ORM
Dramatiq
Pandas
pytest
CSS
HTML
Django REST framework
FastAPI
Vue.js
Vue Router
Vuex
Data Analysis
Data Mining
Elastic Search Platform
AWS ElasticSearch
MongoDB
PostgreSQL
Redis
SQLAlchemy
AWS MWS (Amazon Marketplace Web Service)
AWS S3
SP-API (Amazon Selling Partner API)
Google API
Telegram API
Bash
Celery
RabbitMQ
CI/CD
Cypress
Unit Testing
Docker
Jinja
microservices architecture
Nginx
Marshmallow
Natural Language
quip-API
...

- 5 years of experience in the IT industry as a Python Engineer- Proficient in using technologies such as Django DRF, Flask, Pandas, BeautifulSoup, SQLAlchemy, Asyncio, Flask + Marshmallow, Apscheduler, Jinja, Quip API, Docker, Nginx, Amazon MWS API, Amazon SP-API, Google API, and Telegram API; - Strong in refactoring, bug-fixing, and working with Python, JavaScript, Django, Django Rest Framework;- Skilled in developing faceted search and matching algorithms using ElasticSearch;- Experienced in PDF generation and importing from various formats;- Developed web applications, API interfaces, and automated scripts for data transformation;- Previous experience includes working as a Python developer focused on data scraping for Amazon, eBay, and Walmart products in dropshipping projects;- Also worked as a C# developer on various projects, specializing in web development, scraping, and parsing data;- Upper-Intermediate English;- Available ASAP

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Seniority Senior (5-10 years)
Location United States
Python 5yr.
FastAPl 5yr.
Django
Flask
API
QA Automation 3yr.
RPA (Robotic Process Automation) 2yr.
Parse 2yr.
FastAPI
MySQL
SQL Alchemy
pyTelegramBotAPI
Telegram API
Crypto Services
TON
TonKeeper
Web3
FDD
Project Management
Mini-Apps
Mobile development
Multiprocessing
Telegram Mini Apps
...

- Python Developer with 5+ years of experience in backend development and automation; - Strong abilities with Django and Flask frameworks for web application development; - 4+ years of experience working with SaaS platforms; - Skilled in maintaining and supporting production systems using FastAPI and SQLAlchemy; - Experience with API integration, including financial services and crypto platforms; - Built and supported Telegram bots and automation tools for business operations; - Experience with diagnosing and resolving issues in running services and API changes; - Skilled in Docker deployment and Linux server management (Ubuntu); - Familiar with data reporting and basic analytics through internal monitoring tools; - Open to part-time and distributed team environments with a focus on ongoing system support.

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Seniority Middle (3-5 years)
Location Ternopil, Ukraine
JavaScript 8yr.
React 8yr.
TypeScript 5yr.
Node.js 5yr.
Next.js 3yr.
Redux 4yr.
PHP 1yr.
React Native 1yr.
Angular
AngularJS
Backbone.js
Express
jQuery
NestJS
Angular CLI
Koa.js
ngFor
ngIf
NgRx
ngrx-forms
ngSwitch
React Bootstrap
reactive-forms
Redux-Saga
RxJs
Webpack
Ant Design
Material UI
Cordova
Ionic
AWS ElasticSearch
FireStore
MongoDB
MySQL
NoSQL
PostgreSQL
Redis
Sequelize
SQL
AWS
AWS EC2
AWS Lambda
AWS S3
Blockchain
Apache HTTP Server
Nginx
API
GraphQL
RESTful API
Conflict Management
Emotional Intelligence (EI)
Mentor Aptitude
Team Management
Team Management Skills
DeFi
Fortmatic
MetaMask
NFT
Smart Contract
Wallet Link
Web3
Docker
Kubernetes
MVC
REST
WebRTC
WebSockets
WordPress
Angular Material UI
Restfull API
Subsquid
...

- 10+ years of experience in web development, M.Sc in Software Engineering - Front-End: Angular, React, Vue.js (JavaScript & TypeScript) - Back-End: Node.js, Next.js, TypeScript , PHP - Mobile: React Native - AWS Cloud infrastructure - Control systems (e.g., Git) and familiarity with DevOps practices for continuous integration and deployment (CI/CD). - Unit testing, integration testing, and end-to-end testing. - Experience leading and mentoring a team of developers, including assigning tasks, providing guidance, and ensuring the team's success. Ability to motivate and inspire team members, resolve conflicts, and provide constructive feedback. - Experience conducting assessments and interviews remotely.

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Seniority Architect/Team-lead
Location Ukraine
Node.js 5yr.
React 3yr.
Solidity
NFT
Python 10yr.
C++
JavaScript
R
TypeScript
Express
Next.js
HTML
XML
BigChainDB
Cosmos DB
CouchDB
MongoDB
MySQL
PostgreSQL
SQL
Asterisk
Avalanche
BEP-20
BSC
DeFi
ERC-1155
ERC-20
ERC-721
ETH (Ethereum blockchain)
ICO
IPFS (InterPlanetary File System)
TronChain
Wallets (Integration & Transaction Signing)
Bash
Perl
Docker
GitLab CI
Kubernetes
Odoo
Stripe
Payload Verification
Strap
...

• 15+ years of commercial software development experience • Solid knowledge of Solidity, C++, JavaScript, TypeScript; • Deep understanding of blockchain architecture and smart contract logic; • Cosmos, Tron, Avalanche, Binance Smart Chain, Ethereum dApps; • Strong skills in developing NFT smart contracts. Support and payload verification; • NFT Marketplaces (ERC - 721/1155), Crypto Payment Solutions & DeFi Cross Chain Bridges - ERC-20 Tokens, ICO, DEX, Staking, Swapping; • Highly qualified knowledge of Stripe payment system integration to blockchain data; • 10+ years experience working with Python; • 5 years experience working with Node.js; • Strong abilities with Express; • Experience working with Docker, and Kubernetes (K8s); • 3+ years of development experience with React.js. • No scheduled vacations within the next 3 months;

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Seniority Senior (5-10 years)
Location Ukraine
Haskell 3yr.
Scala 2yr.
Plutus 2yr.
Akka
Cardano
Objective-C
Python
Ruby
Swift
NumPy
Akka Actors
Akka Streams
Clojure
Scala Cats
Scala SBT
Matplotlib
Pandas
SciPy
Seaborn
Ruby on Rails
RVM
AWS ElasticSearch
PostgreSQL
Apache Mesos
Apache Subversion
Gitflow
Bash
Regexp
BugZilla
Docker
GraphQL
RESTful API
Jenkins
Jira
Kafka
ZeroMQ
Waterfall
Akka HTTP
Akka Stream
Coq
Emacs Lisp
Marathon
monocle
OCaml
Plutarch
Plutus Core
portage
pyenv
Skikit-learn
Skipy
...

- 3 years of experience in Plutus / Cardano smart contracts developer role (Plutus Core, Plutarch) - Cardano ecosystem knowledge - Haskell, Scala, Cabal/Stack, GADTs/Type families, Generics, Servant, lenses, mtl, free monads - senior-level professional - Functional programming with FRP, Redux, Event sourcing, Category theory - OOP, OOD, UML, Design patterns, SOLID, DI. TDD, BDD, Unit, functional, and integration testing - 14 years of experience in software engineering

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Seniority Senior (5-10 years)
Location Ukraine
PHP 9yr.
JavaScript 9yr.
MySQL 9yr.
Solidity
Git 9yr.
SOLID 2yr.
C/C++/C# 1yr.
Laravel 1yr.
C++
Python
CodeIgniter
CodeIgniter 3+
CSS
HTML
Ethers.js
Web3.js
Node.js
Remix
MongoDB
BitBucket
Bitcoin Blockchain
BSC
ETH (Ethereum blockchain)
Hardhat
MetaMask
Phantom
Tron
Truffle
WalletConnect
Docker
LAMP
OpenCart
WordPress
Telegram API
LEMP
MERN stack (MongoDB, Express, React, Node)
Metamask SDK
Opencart 3
...

- 10+ years experience as a Full-Stack Developer with of developing robust web applications and services, including extensive experience in both frontend and backend technologies; - Technical proficiency with PHP and MySQL for server-side development, advanced JavaScript utilization on the client side; - Strong abilities with blockchain technology engagement, including smart contracts and wallet development using Solidity, Hardhat, Truffle, WalletConnect, and Metamask SDK; - Experienced with libraries Web3.js, and Ethers.js; - Ability to work Ethereum Blockchain, Binance Smart Chain (BSC), with different wallets including MetaMask; - Adept at working with a variety of frameworks and languages beyond core competencies, such as Laravel, Solidity, Node.js, and C++; - Up-to-date with modern practices, possessing comprehensive experience in codebase upgrades, performance optimization, and integrating third-party APIs; - Successfully led a development team, demonstrating strong leadership and project estimation skills.

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Seniority Senior (5-10 years)
Location Ukraine
JavaScript 7yr.
WordPress 7yr.
Vue.js 5yr.
Chrome Extensions
Ajax
Bootstrap
CSS
HTML
HTML5
HTML/CSS Preprocessors
jQuery
LESS
SASS
SCSS
ES6
Gulp.js
Pinia
Vue Router
Vuex
Webpack
React
Agile
DRY
Kanban
MVC
Scrum
SOLID
TDD
API
RESTful API
Cypress
Unit Testing
Docker
Git
UIKit
...

- 7 years of commercial experience with JavaScript, ECMAScript 6. - 5 years with Vue.js framework (including Vue 3 core principles, Style Guide, Composition API, official documentation of the framework) - Deep understanding of HTML5 and CSS3. - Interacting with API endpoints and other web services. - Converting UI/UX mockups into functional web applications with pixel perfection - Experience with responsive layout, web sites, mini applications in JS and SPA in Vue.js. - Familiar with SOLID, DRY and other clean code design principles. - Experience with UI components like UI Kit & Bootstrap - Unit tests (Cypress) - Projects with Wordpress - Intermediary English

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Seniority Middle (3-5 years)
Location Vinnitsa, Ukraine
MS Dynamics 365
C# 10yr.
JavaScript 10yr.
jQuery 10yr.
CAML 10yr.
CSS 10yr.
HTML 10yr.
Visual Studio 10yr.
Web Services 10yr.
Microsoft SQL Server 7yr.
Vue.js 5yr.
Bootstrap 5yr.
TypeScript 4yr.
AngularJS 4yr.
React 4yr.
Fluent UI 4yr.
Metro UI 3yr.
Express
Node.js
ASP.NET
Fabric UI
HTML5
SPFX
SP-PNP
React Hooks
React Native
Firebase
SQL
MS Flow
Drupal 7
Microsoft Power Platform
Parse Platform
SharePoint
Office 365
Power Apps
Xamarin
...

- IT experience starting in 2015. - Experience with the full lifecycle of designing, developing, installing, configuring, and maintaining applications on SharePoint 2007/2010/2013/2016/2019 Online. Nintex products (Workflows, Forms) - Strong knowledge of .NET, C#, ASP.NET, HTML (HTML5), JavaScript, CSS (CSS3). - Experience with Dynamics CRM, Power Apps, CDS, Power Automate, TypeScript, jQuery, Bootstrap (3, 4), Data Tables, SharePoint libs, ReactJS, React-Redux, Vue.js, Semantic UI. - Extensive experience with MS Visual Studio 2012/2013/2015/2017/2019, VS Code, TFS, Jira, Git. Android, Windows Phone, Xamarin, Outlook Add-ins, Outlook framework, React Native, Parse Platform, Firebase. - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Ukraine
JavaScript 5yr.
Web3.js
React
WebRTC
Ant Design 5yr.
Java
TypeScript
OpenAI
Ajax
Bootstrap
Bootstrap 4
CSS
HTML
Material UI
SCSS
Socket.io
Storybook
Styled components
Tailwind CSS
Ethers.js
i18next
Mobx
React Hooks
React Query
Redux
Redux Thunk
Redux-toolkit
Express
Ext JS
GatsbyJS
NestJS
Next.js
Node.js
MongoDB
PostgreSQL
Blockchain
Agile
Clean Architecture
Kanban
Scrum
Cypress
Jasmine
Jest
Mocha
React-testing-library
Unit Testing
dApps
Hardhat
Solana
Docker
Problem Solving
WebSockets
Chakra UI
CSS3
React-hook-form
seo
WAGMI
Zustand
...

- 5+ years of experience as a Front-end JavaScript Developer; - 5+ years of experience in React.js; - Proficient in Solana Blockchain operations, including managing deposits, executing transfers, creating Phantom wallets, and handling contract call interactions; - Strong abilities working with Web3; - Deep experience in Next.js technology; - Experience with WebRTC, Soket.io; - Good knowledge of Tailwind CSS, Bootstrap, and Chakra UI; - Experience working with Redux, and Docker; - Familiar with Node.js; - Proficiency in testing frameworks like Jest and Cypress; - E-commerce, web, and mobile applications, including learning platforms, chatbots, dApps, and cryptocurrency wallet extensions.

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Seniority Senior (5-10 years)
Location Castel San Giovanni, Italy
React 6yr.
React Native 2yr.
JavaScript 7yr.
Node.js 3yr.
Go
Java
PHP
Ruby
TypeScript
Bootstrap
Chrome Extensions
jQuery
LESS
SCSS
Ember.js
Gulp.js
NPM
React-Saga
Redux
Redux Thunk
Webpack
Java SE
Ruby on Rails
SQL
AWS
DigitalOcean
Linode
Atlassian Trello
Jira
BitBucket
GitHub
GitLab
CI/CD
GraphQL
RESTful API
Jest
Kanban
Scrum
...

- 9 years of proven professional expertise in the IT industry; - Advanced experience in Web Development using JavaScript 7+ years; - Solid experience in software development using ReactJS and React Native (6+ years); 3 Years with Node.js - Good experience in Web development using PHP; - Beginner experience in Web Development using Ruby on Rails; - Beginner experience in Web Development using Java; - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Ukraine
JavaScript 4yr.
Vue.js 2yr.
React 1yr.
TypeScript
CSS
HTML
SCSS
Styled components
Tailwind CSS
Express
Node.js
Vanilla JS
Vue Router
Vuetify
Vuex
Webpack
Cloud Firestore
Firebase
Figma
Git
Google API
RESTful API
Authentication
Nova Poshta API
...

- 3 years of commercial experience, early projects since 2017. (Vue.Js, JavaScript, Chrome extensions) - Has good knowledge of JavaScript, working with arrays, working with elements, sorting and data algorithms. Good understanding of HTML and CSS. - Familiar with methodologies, principles, paradigms, and patterns in software development. - Vuex for state management and Styled Components for styling. - Rest APIs (Google, NovaPoshta) and Git for version control. - Tailwind, Figma, and Webpack for UI - Experienced in using Google Firebase, Cloud Firestore and Authentication.

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Seniority Junior (1-2 years)
Location Dnipro, Ukraine
Delphi 20yr.
React
Node.js
Assembler
C++
Go
Java
JavaScript
PHP
PL
Python
Scala
NumPy
Angular
Vue.js
Ant Design
Apache Spark
Spring Boot
FastAPI
Laravel
Symfony
Yii
Zend
Matplotlib
Pandas
Scrapy
PhpStorm
Power BI
Qlik Sense
Tableau
AWS DynamoDB
CouchDB
DataGrip
FireBird
Google BigQuery
Informix
MariaDB
Microsoft SQL Server
MongoDB
MySQL
MySQL Workbench
NoSQL
Oracle Database
PL/SQL
PostgreSQL
RDBMS
Redis
SQL
SQL Server Management Studio
Toad
AWS
AWS Aurora
AWS Security Groups
API
GraphQL
IntelliJ IDEA
PyCharm
Qt Framework
Visual Studio
WebStorm
Perl
Selenium
Usability tests
Assembly
Delphi UI
Erwin
Firebase Firestore
IDE
InterBase
Microsoft Project
PowerDesigner
Vue draggable
...

- Software Engineer with over two decades of experience, specializing in system design, and system integration (System Design, Technical Leadership, System Integration, Scalability, Security, Communication, Documentation); - Strong abilities with React.js for building, interactive web applications; - Experienced in Java, Spring Boot, and creating microservices; - Skilled in Node.js for backend development; - More than 20+ years of experience with Delphi, Deep knowledge with different versions of Delphi to 10.2; - Experience with various localisations and Delphi UIs; - Expert in various programming languages including C++, JavaScript, and Python; - Experienced in database management with Oracle, MySQL, and PostgreSQL among others (Data Modeling Database Management, Normalization and Denormalization, Data Integrity, Data Warehousing, ETL, SQL and Query Optimization, Database Design, Stored Routines and Packages, Data Backup and Recovery, Data Migration, Web Scraping); - Experience in technical leadership in various domains such as enterprise software, finance, and healthcare.

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Seniority Expert (10+ years)
Location Ukraine

Our most common engagement models

Project-based Model

Get a custom platform design along with any other services you might need (expert consultations, product design, web engineering, digital platforms, mobile application development, Operations and Clouds, Data and Analytics, Desktop, Embedded systems, Blockchain, No-code/Low-code, Website optimization, SEO and much more) at a fixed price.

Dedicated Development Team

Get a dedicated team of software developers working on your project according to our flexible time and materials payment scheme.

Consulting

We help our clients to identify the potential of a software development for their organization including market research, project’s feasibility assessment, analysis of blockchain platforms, tools, right features prioritization.

Case Studies

We closely collaborate with recruitment & talent acquisition teams on urgent or hard-to-fill positions. Discover how startups and top-tier companies benefit.
Upstaff builds AI-Driven Data Platform for Environmental Organizations
Case Studies

Upstaff builds AI-Driven Data Platform for Environmental Organizations

Bringing 2M+ Wallet Ecosystem to the Next Level Decentralized Operating System.
Case Studies

Bringing 2M+ Wallet Ecosystem to the Next Level Decentralized Operating System.

Job Description – The story of creating your own Chrome extension
Business

Job Description – The story of creating your own Chrome extension

Blog

Cracking the 2025 Hiring Code: Navigating AI Chaos, Candidate Overload, and How Upstaff Wins the Talent Game

Cracking the 2025 Hiring Code: Navigating AI Chaos, Candidate Overload, and How Upstaff Wins the Talent Game

2025 hiring feels like you’re pulling off a heist in a sci-fi flick: AI’s churning out glossy resumes that don’t match reality, candidates are juggling virtual assistants like sidekicks, and the market’s flooded with folks who can barely spell “React,” let alone code it.
Bohdan Kashka
Bohdan Kashka
YouTeam Acquired by Toptal: A Ukrainian Success Meets Global Power
Business

YouTeam Acquired by Toptal: A Ukrainian Success Meets Global Power

Bohdan Kashka
Bohdan Kashka
talently – app developer in one click!
Business

talently – app developer in one click!

Bohdan Kashka
Bohdan Kashka
Cracking the 2025 Hiring Code: Navigating AI Chaos, Candidate Overload, and How Upstaff Wins the Talent Game

Cracking the 2025 Hiring Code: Navigating AI Chaos, Candidate Overload, and How Upstaff Wins the Talent Game

2025 hiring feels like you’re pulling off a heist in a sci-fi flick: AI’s churning out glossy resumes that don’t match reality, candidates are juggling virtual assistants like sidekicks, and the market’s flooded with folks who can barely spell “React,” let alone code it.
Bohdan Kashka
Bohdan Kashka
YouTeam Acquired by Toptal: A Ukrainian Success Meets Global Power
Business

YouTeam Acquired by Toptal: A Ukrainian Success Meets Global Power

YouTeam, the Ukrainian-founded talent platform at YouTeam.io, has been snapped up by Toptal, a U.S.-based freelance giant at Toptal.com. Co-founder Yurij Riphyak announced the deal on LinkedIn, merging YouTeam’s 50,000+ vetted engineers into Toptal’s elite network. While it’s a win for innovation, it also shows how stronger capital can bury great new initiatives to dominate the freelance market. Read more about this shift in the tech talent wars.
Bohdan Kashka
Bohdan Kashka
talently – app developer in one click!
Business

talently – app developer in one click!

Hey there, I’ve been tangled up in finding developers pretty much every day, and I want to share the story of how I made the talently Chrome Extension, trying to solve my own headaches. I built it for myself at first, and now I hope it can help others too. This isn’t some polished pitch—it’s just my thoughts, the problems I’ve hit, and how I tackled them.
Bohdan Kashka
Bohdan Kashka
More Articles Arrow

Frequently Asked Questions

What is Upstaff? Arrow

Upstaff is a service company with its own in-house engineering, and management competence, leveraging the community of software development companies’ resource network.

When can my team start work? Arrow

Our developers can start immediately or within two weeks after the project is confirmed.