Custom Software Development & Consulting Company

Upstaff is a strategic alliance between industry-leading teams and consultants in FinTech, Retail, Banking, Blockchain, .IoT, and other domains. With a team of over 50 in-house FTEs and 2,000+ remote vetted engineers, 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
Accenture
SpiralScout
Valtech
Unisoft
Diceus
Ciklum
Infopulse
Adidas

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Meet Upstaff Team

Python 5yr.
Django 3yr.
Mobile development
Flask
API
FastAPl 5yr.
QA Automation 3yr.
Parse 2yr.
RPA 2yr.
DDOS protection
Solidity
Threads
Aiogram
AsyncIO
pytest
Tortoise ORM
Web3.py
CSS
HTML
FastAPI
Mini-Apps
NestJS
Node.js
React
MariaDB
MongoDB
MySQL
PostgreSQL
Redis
SQL
SQL Alchemy
SQLAlchemy
pyTelegramBotAPI
RESTful API
Telegram API
Celery
Kafka
Crypto Services
TON
TonKeeper
Web3
cyber security
Selenium
Docker
Kubernetes
FDD
serverless
Jinja2
Project Management
Telegram Mini Apps
Ubuntu
VPN
BATM
Multiprocessing
...

- Python Developer with 5+ years of experience in backend development and automation: Django (3 years), Flask, and Fast API for web application development; - Maintaining and supporting production systems using FastAPI and SQLAlchemy, API integrations including financial services and crypto platforms; - Built and supported Telegram bots and automation tools for business operations; - Docker containerization: Docker-compose, Docker via Render (serverless). 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. - Reached the Top 10 freelance Python engineers on the local market at the age of 17 (showcasing early talent and initiative). - Worked on projects with a multi-million user base, contributing to scalable architecture and high-load system stability. - Successfully launched an educational platform in the USA, now actively used by students, tutors, and academic institutions. - Represented the dev team at the international Wefi Beyond Banking Summit, delivering a product presentation to a global fintech audience.

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Seniority Middle (3-5 years)
Location Ternopil, Ukraine
Haskell 3yr.
Scala 2yr.
Plutus 2yr.
Akka
Cardano
Objective-C
OCaml
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
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
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
Kubernetes
GitLab CI
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
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
Koa.js
NestJS
Angular CLI
ngFor
ngIf
NgRx
ngrx-forms
ngSwitch
React Bootstrap
reactive-forms
Redux-Saga
RxJs
Webpack
Angular Material UI
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
Subsquid
Wallet Link
Web3
Docker
Kubernetes
MVC
REST
WebRTC
WebSockets
WordPress
...

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
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
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
PostgreSQL 5yr.
REST 5yr.
TypeScript 3yr.
Python
Go
Gin 5yr.
GORM 5yr.
CSS 5yr.
HTML 5yr.
Zend 5yr.
Docker 5yr.
Git 5yr.
Microsoft Visual Studio Code 5yr.
Gorilla Mux 3yr.
Node.js 3yr.
WebSockets 3yr.
Google Maps API 3yr.
Expo.io 2yr.
Kubernetes 2yr.
Akka Streams 1yr.
Apache Spark 1yr.
ASP.NET MVC Pattern 1yr.
ASP.NET WebForms 1yr.
Entity Framework 1yr.
.Net WCF 1yr.
ATL 1yr.
MFC 1yr.
jQuery 1yr.
XML 1yr.
RubyMine 1yr.
Apache Hive 1yr.
Apache Nifi 1yr.
AWS ElasticSearch 1yr.
Bigtable 1yr.
CockroachDB 1yr.
Microsoft SQL Server 1yr.
MongoDB 1yr.
Oracle Database 1yr.
GCP 1yr.
Dataproc 1yr.
Google BigQuery 1yr.
Google Cloud Pub/Sub 1yr.
Consul 1yr.
REST C++ SDK 1yr.
Qt Creator 1yr.
STL 1yr.
Boosting 1yr.
ChromeDP 1yr.
Assembler
Assembly
C
C#
C++
Java
JavaScript
Kotlin
Ruby
Swift
X++
chi
flax
Google JAX
Grok
JAX
LangChain
NumPy
OpenAI
PyTorch
Spacy
TensorFlow
xAI
MS Dynamics 365
Beego
Echo
Gramework
Boost
Cross-platform UI
Django
FastAPI
Flask
Pandas
React Hooks
Apache Airflow
LightGBM
moving pandas
Aerospike
FoundationDB
Memcached
MySQL
Redis
AWS
Azure
MS Azure
Microsoft Power Platform
Azure DevOps Server (ex TFS Team Foundation Server)
Kitura
Bash
PowerCLI
PowerShell
Centos
FreeBSD
Linux
macOS
Windows
fasthttp
GRPC
NAT
Networking
Design patterns
Observer
Qemu
OpenAPI
Swagger
Mercurial
SVN
Grafana
Prometheus
Zabbix
Qt Framework
Visual Studio
NATS
RabbitMQ
Selenium
TFS
Code Blocks
DAG
fasthhtp
logrus
Multi-threading
Quart
Tesseract OCR
zap
...

* Master’s Degree in Computer Science * 19 years in Software Engineering: Python, Kotlin, Swift, C/C++, and TypeScript in software engineer, team lead, and software architect roles. * Data processing with numpy, pandas, moving pandas, airflow, spark,and nifi. * Designed and implemented a scalable multi-microservice backend for an enterprise AdTech CRM, integrating 10+ third-party services and streamlining client management operations. * Built and deployed a billing system for a money exchange platform, integrating third-party payment systems and delivering a user-friendly web interface for seamless transactions. * Optimized data processing pipelines by implementing quantiles on streams, enabling real-time analytics and supporting large-scale data operations for scientists and business stakeholders. * Extensive background in data processing and reporting. Good abilities in SCM tools like Git, and in multi-threading and networking. Strong skills in Docker, gRPC; * Cloud service platforms: AWS, Google Cloud, and MS Azure; * Experience with DBMS, PostgreSQL, MySQL, MongoDB; * Certificated knowledge of Blockchain; * Certified Senior Go Engineer (12 years with GoLang).

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Seniority Expert (10+ years)
Location Ukraine
Python
Computer Vision (CV)
Pandas
ML
AI
Deep Learning
Hugging Face
Keras
Kubeflow
Mlflow
NLP
NumPy
OpenCV
PyTorch
Scikit-learn
Spacy
TensorFlow
Matplotlib
NLTK
Plotly
poetry
SciPy
Streamlit
DVC
MySQL
AWS RT
GCP Storage
Google BigQuery
CI/CD
Jenkins
Docker
Git
Payment Gateways
Regexp
Sublime Text
argparse
Custom API
Deep Learning (DL)
Kubeflow for ML pipelines
Label Studio
MMCV
ONNX
Recommender Systems
tf-serving
Voxel51
YOLO
...

Data Science engineer with over 3 years of practical commercial experience in Natural Language Processing (NLP), Computer Vision (CV), and Recommender Systems. Available skills in data analysis using machine learning approaches to satisfy business needs, problem-solving, and other tasks in this sphere. A person, focused on obtaining the best results, using all knowledge and skills. Friendly and ready to help the team complete tasks and solve certain problems.

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Seniority Middle (3-5 years)
Location Ternopil, Ukraine
Data Analysis 10yr.
Python
Prompt Engineering
C#
Elixir
JavaScript
R
NumPy
TensorFlow
ASP.NET Core Framework
ASP.NET MVC Pattern
Entity Framework
caret
dplyr
rEDM
tidyr
dash.js
Flask
Matplotlib
NLTK
Pandas
Plotly
SciPy
Shiny
Basic Statistical Models
Chaos Theory
Cluster Analysis
Decision Tree
Factor Analysis
Jupyter Notebook
Linear and Nonlinear Optimization
Logistic regression
Multi-Models Forecasting Systems
Nearest Neighbors
Nonlinear Dynamics Modelling
Own Development Forecasting Algorithms
Principal Component Analysis
Random Forest
Ridge Regression
Microsoft SQL Server
PostgreSQL
AWS
GCP
Anaconda
Atom
R Studio
Visual Studio
Git
RESTful API
Windows
...

- 10+ years in Forecasting, Analytics & Math Modelling - 8 years in Business Analytics and Economic Processes Modelling - 5 years in Data Science - 5 years in Financial Forecasting Systems - Master of Statistics and Probability Theory (diploma with honours), PhD (ABD) - BSc in Finance - Strong knowledge of Math & Statistics - Strong knowledge of R, Python, VBA - Strong knowledge of PostgreSQL and MS SQL Server - 3 years in Web Development: Knowledge of C#, .Net and JavaScript for web development - Self-motivated, conscientious, accountable, addicted to data processing, analysis & forecasting - Engineering, Understanding AI and LLMs

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Seniority Senior (5-10 years)
Location Ukraine
Scala
NLP
Akka
Apache Spark
Akka Actors
Akka Streams
Cluster
Scala SBT
Scalatest
Apache Airflow
Apache Hadoop
AWS ElasticSearch
PostgreSQL
Slick database query
AWS
GCP
Haddop
Microsoft Azure API
ArgoCD
CI/CD
GitLab CI
Helm
Travis CI
GitLab
HTTP
Kerberos
Kafka
RabbitMQ
Keycloak
Swagger
Kubernetes
Terraform
Observer
Responsive Design
Unreal Engine
...

Software Engineer with proficiency in data engineering, specializing in backend development and data processing. Accrued expertise in building and maintaining scalable data systems using technologies such as Scala, Akka, SBT, ScalaTest, Elasticsearch, RabbitMQ, Kubernetes, and cloud platforms like AWS and Google Cloud. Holds a solid foundation in computer science with a Master's degree in Software Engineering, ongoing Ph.D. studies, and advanced certifications. Demonstrates strong proficiency in English, underpinned by international experience. Adept at incorporating CI/CD practices, contributing to all stages of the software development lifecycle. Track record of enhancing querying capabilities through native language text processing and executing complex CI/CD pipelines. Distinguished by technical agility, consistently delivering improvements in processing flows and back-end systems.

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Seniority Senior (5-10 years)
Location Ukraine
XSLT 10yr.
Python
XML
C#
Java
JavaScript
NumPy
Beautiful Soup
Pandas
Scrapy
CSS
HTML
XPATH
Flask
JSON
Visual Basic .NET
Microsoft SQL Server
AWS
AWS Lambda
Google AutoML
Regexp
Selenium Webdriver
SFTP
CAT Tools
IATA NDC Standard XML
JATS XML
Java Saxon Parser
libxslt
Python Requests Library
Schematron
SOAP XML
SVG
XSD
...

- 12+ years of experience in IT - 10+ years of experience with XSLT - Writing, testing and maintaining the XSLT code that applies some filtration and conditions on XML - Converting IATA NDC Standard XML Content format into IATA NDC Standard XML format using XSLT - Familiar with many processing engines like Saxon (Java) - libxslt (C) - Python’s package - Upper-intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Cairo, Egypt
AEM
Java
React
Ajax
CSS
HTML
jQuery
Angular
Ext JS
Node.js
Apache Sling
Java Server Pages (JSP)
Java Servlets
JPA
JSF
JSTL
Handlebars.js
Mustache
MongoDB Compass
PostgreSQL
AEM DAM
AEM Dispatcher
AEM Email API
AEM HTL
AEM Job Scheduler
AEM Search Functionality
AEM Sightly
CQ5
Apache HTTP Server
Apache Tomcat
Apache Maven
JUnit
Mockito
Apache NetBeans
Eclipse
IntelliJ IDEA
Microsoft Visual Studio Code
Apache Subversion
Git
SVN
Gradle
OSGi
...

Experienced engineer with 11 years of experience in the following areas: - Adobe AEM Lead Developer (AEM 5.6 Lead Developer Certified) - Java, JavaScript (React), Vanilla JS - AEM Component creation (UI as well as server-side), including both reusable and page components with best in standard coding practices - AEM DAM (Digital Asset Management) - Servlet, Job Scheduler, Search Functionality, Email API, Sightly - Workflow implementation - MSM-Creation of multilingual sites using live copy - Selective Dispatcher cache invalidation - Unit testing frameworks, such as JUnit and Mockito. - Source control management tools, such as Apache Subversion, Git - Well-versed with a technical understanding of Extjs, Apache sling, and OSGi, needed for the development of an AEM project, starting from scratch. - Involved in Design, Coding, Testing, Code review, and performance tuning of code and queries.

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Seniority Senior (5-10 years)
Location India

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.
Europe’s Data Vision: Dataspaces for Zero-Trust AI Infrastructure
Artificial Intelligence & Machine Learning Engineer (AI & ML)

Europe’s Data Vision: Dataspaces for Zero-Trust AI Infrastructure

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.

Blog

AI Jobs: What’s Hot in 2025?
Business

AI Jobs: What’s Hot in 2025?

Discover the most in-demand AI jobs, technologies, and rates from the first half of 2025 on Upwork and Upstaff.
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

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
AI Jobs: What’s Hot in 2025?
Business

AI Jobs: What’s Hot in 2025?

Discover the most in-demand AI jobs, technologies, and rates from the first half of 2025 on Upwork and Upstaff.
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
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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.