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
to Get top-quality software development services

Contact Us

Meet Upstaff Team

Oleksii , Senior JavaScript Full-Stack Engineer

- 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.

JavaScript

JavaScript   8 yr.

React

React   8 yr.

TypeScript

TypeScript   5 yr.

Node.js

Node.js   5 yr.

Next.js

Next.js   3 yr.

Anatolii K. , Python Software Engineer

$30/hr

- 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

Python

Python

Django

Django

Flask

Flask

Serhii , Solidity & Full-stack Web3 Engineer, Architect, Team-Lead.

• 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;

Solidity

Solidity

NFT

NFT

Node.js

Node.js   5 yr.

React

React   3 yr.

Denys K , Python Developer

- Strong background in computer engineering and automation; - 5+ years of experience with Python; - Good knowledge of the blockchain industry and web3 project development; - Proven expertise in developing mobile applications, crafting solutions for crypto services, and creating telegram mini-apps; - Skilled in web automation, bot development, parsing, and working with web3 technologies.

Python

Python   5 yr.

QA Automation

QA Automation   3 yr.

Telegram API

Telegram API

Telegram Mini Apps

Telegram Mini Apps

Yurii P. , Haskell and Scala Engineer, Plutus smart contracts developer

- 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

Haskell

Haskell   3 yr.

Scala

Scala   2 yr.

Akka

Akka

Plutus

Plutus   2 yr.

Cardano

Cardano

Oleksandr O , Full-stack Developer

- 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.

PHP

PHP   9 yr.

JavaScript

JavaScript   9 yr.

MySQL

MySQL   9 yr.

Solidity

Solidity

Taras K. , Software Engineer, Architect

- 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) - 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). - A record of technical leadership in various domains such as enterprise software, finance, and healthcare.

React

React   8 yr.

Delphi

Delphi   20 yr.

Node.js

Node.js   8 yr.

Yehor R. , Frontend Software Engineer (Javascript, Vue, React)

$1500/month

- 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.

JavaScript

JavaScript   4 yr.

Vue.js

Vue.js   2 yr.

Viacheslav Р , Automation Test Engineer / SDET

$40/hr, $6500/month

- 10+ years in software quality engineering with priority in automation testing and SDET; - Programming languages: Javascript, Typescript, Ruby, Java (Basic); - SQL Server SQL/TSQL, MS SQL Server 2005/2012, PostgreSQL/MySQL/MongoDB, MariaDB; - Methodologies include Agile, Scrum, TDD, and BDD; - Projects with large software service companies, SMBs and startups. Domains include CRM, banking, healthcare, insurance, and trading. Business oriented projects, working as team member and independent engineer ( USA, France, and UK teams), open source projects; - Created test documentation/test plan; Performing functional, integration, e2e, API, system testing of product; - Automation with Cypress, and CI/CD maintenance using tools like Jenkins, CircleCI, Docker, Github Actions, GitlabCI, and AWS cloud infrastructure; - QA tools include Cypress, Cucumber, Jenkins, Postman, Selenium and Capybara; - Holds a Master's Degree in Network Engineering and Economics; - ISTQB Certification. AWS and Cisco security trainings. - Availability and start: full-time, in two weeks

JavaScript

JavaScript   4 yr.

Cypress

Cypress

Cucumber

Cucumber

Postman

Postman

Nattiq , Data Engineer

- 12+ years experience working in the IT industry; - 12+ years experience in Data Engineering with Oracle Databases, Data Warehouse, Big Data, and Batch/Real time streaming systems; - Good skills working with Microsoft Azure, AWS, and GCP; - Deep abilities working with Big Data/Cloudera/Hadoop, Ecosystem/Data Warehouse, ETL, CI/CD; - Good experience working with Power BI, and Tableau; - 4+ years experience working with Python; - Strong skills with SQL, NoSQL, Spark SQL; - Good abilities working with Snowflake and DBT; - Strong abilities with Apache Kafka, Apache Spark/PySpark, and Apache Airflow; - Upper-Intermediate English.

Python

Python   4 yr.

Azure

Azure   5 yr.

Oleg V. , Node.js Software engineer

$42/hr

• 15+ years JavaScript programming • Over 10 years in Node.JS programming • Familiar with React.js • Experience building highly scalable distributed web applications and browser extensions • Extensive experience with REST services • Strong communication and cooperation skills • Solid experience as a Backend developer • Fluent in English, written and spoken • long Term experience in remote work with USA and Europien companies • Self-directed person, with proven ability to manage goals and deadlines effectively

Node.js

Node.js   10 yr.

Henry A. , Python engineer with Data Quality and Scientist skills

- 8 years experience with various data disciplines: Data Engineer, Data Quality Engineer, Data Analyst, Data Management, ETL Engineer - Extensive hands-on expertise with Reltio MDM, including configuration, workflows, match rules, survivorship rules, troubleshooting, and integration using APIs and connectors (Databricks, Reltio Integration Hub), Data Modeling, Data Integration, Data Analyses, Data Validation, and Data Cleansing) - Data QA, SQL, Pipelines, ETL, Automated web scraping. - Data Analytics/Engineering with Cloud Service Providers (AWS, GCP) - Extensive experience with Spark and Hadoop, Databricks - 6 years of experience working with MySQL, SQL, and PostgreSQL; - 5 years of experience with Amazon Web Services (AWS), Google Cloud Platform (GCP) including Data Analytics/Engineering services, Kubernetes (K8s) - 5 years of experience with PowerBI - 4 years of experience with Tableau and other visualization tools like Spotfire and Sisense; - 3+ years of experience with AI/ML projects, background with TensorFlow, Scikit-learn and PyTorch; - Upper-intermediate to advanced English, - Henry is comfortable and has proven track record working with North American timezones (4hour+ overlap)

Reltio

Reltio

Databricks

Databricks

Python

Python   9 yr.

SQL

SQL   6 yr.

Power BI

Power BI   5 yr.

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.
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

Transforming CRM for Efficiency for European and E-commerce Payment Provider
Case Studies

Transforming CRM for Efficiency for European and E-commerce Payment Provider

Blog

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!

Bohdan Kashka
Bohdan Kashka
Upwork Reviews from Real Users
Business

Upwork Reviews from Real Users

Nazar Solomakha
Nazar Solomakha
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
Upwork Reviews from Real Users
Business

Upwork Reviews from Real Users

Upwork reviews from real users. Everything about fees, customer experience, and proposals in one article — READ before you start using Upwork!
Nazar Solomakha
Nazar Solomakha
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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.