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.

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Meet Upstaff Team

Oleksii , Senior JavaScript Full-Stack Engineer

Identity Verified

- 10+ years of experience in web development, M.Sc in Software Engineering - Mastery of JavaScript and its associated frameworks and libraries, such as React, Angular, and Vue.js for front-end; Node.js, Next.js for back-end and React Native for mobile app development. - Experience with PHP and Cloud infrastructure such as AWS. - Proficiency in using version control systems (e.g., Git) and familiarity with DevOps practices for continuous integration and deployment (CI/CD). - Implementing and overseeing testing processes, including 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.

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

Identity Verified

• 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 (non-fungible token)

NFT (non-fungible token)

Node.js

Node.js   5 yr.

React

React   3 yr.

Denys K , Python Developer

Identity Verified

- 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

Anatolii K. , Python Software Engineer

$30/hr
Identity Verified

- 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

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

Identity Verified

- 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

Vadym M , Front-end JavaScript Developer

Identity Verified

- 5+ years of experience as a Front-end JavaScript Developer. - 5+ years of experience in React.js; - 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; - Strong abilities working with Web3; - Proficiency in testing frameworks like Jest and Cypress; - E-commerce, web, and mobile applications, including learning platforms, chatbots, dApps, and cryptocurrency wallet extensions.

JavaScript

JavaScript   5 yr.

Web3.js

Web3.js

React

React

WebRTC (Web Real-Time Communication)

WebRTC (Web Real-Time Communication)

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 (Microsoft Azure)

Azure (Microsoft Azure)   5 yr.

Mykhaylo R. , DevOps/SRE/Lead System Administrator

Identity Verified

- Over 20 years in IT with a master's degree in Cybernetics - Proficient in Ansible: Extensive experience in deploying and managing Ansible-driven infrastructure, particularly highlighted in roles as SRE/Architect (Aug 2018 – Present) and Senior DevOps Engineer/Lead Sysadmin (Aug 2020 – May 2021), where Ansible was pivotal in scaling a learning platform from 1,000 to over 100,000 students and in key migration projects. - Expertise in Windows Environments: Demonstrated strong skills in managing Windows environments, especially as an SRE/Architect (Aug 2018 – Present) and CTO (2013 – Mar 2022), involving Windows AD+MSSQL backoffice management and ITIL Service Management framework implementation on Windows platforms. - Versatile IT Roles with Ansible and Windows: Across various roles including IT Service Manager, Senior DevOps Engineer, and CTO, consistently applied Ansible and Windows technologies in large-scale infrastructure projects and day-to-day operations, showing versatility and depth in these areas. - Managing the growth of the learning platform from 1,000+ to 100k+ active students - ITIL v3 Foundations Certificate - More than 5 years of experience in leading ITIL Service Management capability and implementing end-to-end ITIL Service Management framework - Strong experience in using ServiceNow and Jira Service Desk for ITSM - Experienced IT/Telecom Specialist - UNIX and UNIX-Like OS (FreeBSD, Linux, SunOS, MacOS X) background - Over 20 years of Windows/windows server family. From NT4.0 /win3.1 up to Server2019. As well as upgrading Up to 15 years with server HW, and 13 years with storage solutions - Infrastructure problem-solver with a strong view on reliability, performance, and disaster recovery - Fluent English

Bash

Bash   10 yr.

Shell Scripts

Shell Scripts   10 yr.

MySQL

MySQL   10 yr.

Ansible

Ansible

Ansible Playbook

Ansible Playbook

Nata L , Data Analyst with BI and DE skills

Identity Verified

- Oriented Data and Business Intelligence Analysis engineer with Data Engineering skills. - 6+ years of experience with Tableau (Certified Tableau Engineer) - Experience in Operations analysis, building charts & dashboards - 20+ years of experience in data mining, data analysis, and data processing. Unifying data from many sources to create interactive, immersive dashboards and reports that provide actionable insights and drive business results. - Adept with different SDLC methodologies: Waterfall, Agile SCRUM - Knowledge of performing data analysis, data modeling, data mapping, batch data processing, and capable of generating reports using reporting tools such as Power BI (advanced), Sisence(Periscope) (expert), Tableau (Advanced), Data Studio (Advanced) - Experience in writing SQL Queries, Big Query, Python, R, DAX to extract data and perform Data Analysis - AWS, Redshift - Combined expertise in data analysis with solid technical qualifications. - Advanced English, Intermediate German - Location: Germany

Python

Python   6 yr.

SQL

SQL   8 yr.

Microsoft Power BI

Microsoft Power BI

Data Analysis Expressions (DAX)

Data Analysis Expressions (DAX)   4 yr.

Tableau

Tableau   6 yr.

Kostyantyn , Javascript and Wordpress Engineer

$25/hr
Identity Verified

- 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

JavaScript

JavaScript   7 yr.

Vue.js

Vue.js   5 yr.

WordPress

WordPress   7 yr.

Vlad L. , JavaScript Software Engineer (React, React Native, Node)

$35/hr
Identity Verified

- 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

React

React   6 yr.

React Native

React Native   2 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.
Upstaff Scales Ukrfinservice Platform with Qualified Digital Signature and System Upgrades
Case Studies

Upstaff Scales Ukrfinservice Platform with Qualified Digital Signature and System Upgrades

20x Active Users for Airdrop Platform with Telegram Mini-App and Chatbot
Case Studies

20x Active Users for Airdrop Platform with Telegram Mini-App and Chatbot

Building Electronic Data Interchange (EDI) for the Top Online Pet Food and Supplies Retailer
Case Studies

Building Electronic Data Interchange (EDI) for the Top Online Pet Food and Supplies Retailer

Blog

Tap-to-Earn Game Development on the TON Blockchain
Blockchain (Web 3.0)

Tap-to-Earn Game Development on the TON Blockchain

Blockchain technology has sparked rapid evolution in the gaming industry over the past decade. The latest development in this trend is ‘tap-to-earn’ games: play-to-earn games so simple that they can be reduced down to tapping – simple, mindless, often addictive, and ultimately remunerated with cryptocurrency or some other kind of digital asset.
Bohdan Kashka
Bohdan Kashka
Data Analyst job description
Delivery Management & Analytics

Data Analyst job description

Roman Masniuk
Roman Masniuk
Time to Fill: A Key Recruitment Metric
Delivery Management & Analytics

Time to Fill: A Key Recruitment Metric

Yaroslav Kuntsevych
Yaroslav Kuntsevych
Tap-to-Earn Game Development on the TON Blockchain
Blockchain (Web 3.0)

Tap-to-Earn Game Development on the TON Blockchain

Blockchain technology has sparked rapid evolution in the gaming industry over the past decade. The latest development in this trend is ‘tap-to-earn’ games: play-to-earn games so simple that they can be reduced down to tapping – simple, mindless, often addictive, and ultimately remunerated with cryptocurrency or some other kind of digital asset.
Bohdan Kashka
Bohdan Kashka
Data Analyst job description
Delivery Management & Analytics

Data Analyst job description

A Data Analyst is someone who collects data from different areas of the business and uses the information to make decisions or help other members of the team, or the leadership team, make decisions.
Roman Masniuk
Roman Masniuk
Time to Fill: A Key Recruitment Metric
Delivery Management & Analytics

Time to Fill: A Key Recruitment Metric

Time to fill is one of the most important recruitment metrics that every hiring manager should know. It provides an insight into the strengths and weaknesses of your recruitment strategy.
Yaroslav Kuntsevych
Yaroslav Kuntsevych
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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.