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 - Client
SpiralScout - Client
Valtech - Client
Unisoft - Client
Diceus - Client
Ciklum - Client
Infopulse - Client
Adidas - Client
Accenture - Client
SpiralScout - Client
Valtech - Client
Unisoft - Client
Diceus - Client
Ciklum - Client
Infopulse - Client
Adidas - Client

Hire the Upstaff team
to Get top-quality software development services

Contact Us

Meet Upstaff Team

JavaScript 8yr.
React 8yr.
TypeScript 5yr.
Node.js 5yr.
Next.js 3yr.
...
  • 10+ years of experience in web development, M.Sc in Software Engineering, GAI, LLMs.
  • Back-End: Node.js, Next.js, TypeScript , PHP, Java (Basics).
  • Front-End: JavaScript & TypeScript (React, Angular, Vue.js).
  • Mobile: React Native.
  • AWS Cloud infrastructure, Lambda/Serverless, SNS/SQS Queues.
  • 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. Conducting assessments and interviews remotely. Ability to motivate and inspire team members, resolve conflicts, and provide constructive feedback.
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Seniority Architect/Team-lead
Location Ukraine
Python 5yr.
Django 3yr.
Mobile development
Flask
API
...
- 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
Location Ternopil, Ukraine
Haskell 3yr.
Scala 2yr.
Plutus 2yr.
Akka
Cardano
...
- 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
Location Ukraine
Node.js 5yr.
React 3yr.
Solidity
NFT
...
• 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
Location Ukraine
Python
Django
Flask
...
- 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
Location United States
PHP 9yr.
JavaScript 9yr.
MySQL 9yr.
Solidity
...
- 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
Location Ukraine
JavaScript
TypeScript
Node.js
PostgreSQL
AWS
...
  • 15+ years in software engineering and cloud platforms. Full-stack development experience with hands-on work directly at client sites across Europe.
  • JavaScript, TypeScript, Java (Spring Boot), and Python languages.
  • integration with CRM, CMS, BPM, and enterprise platforms such as Microsoft Dynamics 365, Salesforce, Contentful, and Camunda; Client-facing,
  • Cloud platforms AWS, Azure, and GCP; serverless architecture, CI/CD pipelines, Docker, Kubernetes, Terraform orchestration.
  • AI and data-driven systems: chatbots, streaming video platforms, AI-generated content, recommendation workflows. Integration with LLM-based services using LangChain, OpenAI-compatible APIs, and Python-based machine learning tools.
  • Performance optimization, automated testing, BDD/TDD practices. Microfrontend and monorepository setups.
  • System modernization, MVP development, and large-scale platform transformations for media, fintech, telecom, travel, healthcare, cryptocurrency, and Web3 domains.

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Seniority Senior
Location Kyiv, Ukraine
Python 9yr.
SQL 6yr.
Databricks
PySpark
...
  • 9 years experience with various data disciplines: Data Engineer, Data Quality Engineer, Data Analyst, Data Management, ETL Engineer
  • Built and optimized production-grade PySpark pipelines handling millions of records, including complex transformations, joins, aggregations, and backfills, with a strong focus on performance and data quality.
  • Automated Web scraping (Beautiful Soup and Scrapy, CAPTCHAs and User agent management)
  • Data QA, SQL, Pipelines, ETL
  • Data Analytics/Engineering with Cloud Service Providers (AWS, GCP)
  • Extensive experience with Spark and Hadoop, Databricks (hands-on with Spark-based pipelines deployed in cloud environments and have used Databricks as the execution and collaboration layer: jobs, notebooks, cluster configs).
  • 7 years of experience working with MySQL, SQL, and PostgreSQL;
  • 5 years of experience with Amazon Web Services (AWS)
  • Google Cloud Platform (GCP): BigQuery, GCS, App Engine, data pipelines, and Azure (basic knowledge)
  • 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;
  • 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)
  • Upper-intermediate to advanced English
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Seniority Senior
Location Nigeria
JavaScript 7yr.
WordPress 7yr.
Vue.js 5yr.
Chrome Extensions 1yr.
...
  • 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
Location Vinnitsa, Ukraine
Azure 5yr.
Python 4yr.
...
- 12+ years of experience in IT, with 12+ years in Data Engineering and Data Architecture, including Oracle Databases, Data Warehousing, Big Data, and real-time streaming systems; - Experience in designing and maintaining enterprise Data Warehouses, leading cloud migration initiatives across Azure, AWS, and GCP; - Strong architectural expertise in ETL/ELT pipelines, batch/real-time processing, and data governance/quality frameworks; - Deep knowledge of Big Data ecosystems (Cloudera, Hadoop, Databricks, Synapse Analytics, HDInsight, AWS EMR); - Skilled in multi-cloud architecture design using Snowflake, DBT, Cosmos DB, Redshift, BigQuery, Athena, and Data Lake solutions; - Experienced in data streaming and integration with Apache Kafka, Apache Spark, PySpark, and Airflow; - Expertise in BI and reporting systems with Power BI and Tableau for data visualization and analytics delivery; - Strong foundation in database administration and security: Oracle EBS R12, RAC/ASM, WebLogic, SOA Suite, ERP systems, database audits and compliance; - Certified in Azure Data Engineer, AWS Data Analytics Specialty, Confluent Kafka, Oracle DBA.
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Seniority Senior
Location Warsaw, Poland
JavaScript 6yr.
Node.js
NestJS
Express
Fastify
...
• Full-stack engineer with 6+ years of experience with scalable architectures, clean APIs, and responsive interfaces • Developed and implemented backend systems for fintech and crypto applications using Node.js, NestJS, and Prisma, including integrations with multiple payment providers and API gateways, resulting in scalable architectures handling diverse data formats. • Optimized database interactions and workflows in corporate platforms with AWS Neptune, DynamoDB, Elasticsearch, and Redis, accelerating integration tests by 15% through redesigned test environments. • Built asynchronous event handling and caching mechanisms with NATS, Redis, and BullMQ for product management and payment systems, improving reliability via message-driven communication. • Integrated monitoring tools like Prometheus and Grafana in deployment pipelines using GitLab CI, enabling metrics collection for endpoints and integrations in real-time services.
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Seniority Senior
Location Bialystok, Poland
TypeScript 7yr.
Node.js 6yr.
JavaScript
React
Angular
...
- 10 years of software development experience - 7 years of commercial experience with TypeScript and 6 years of commercial experience with Node.js - Upper-Intermediate English - Available ASAP
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Seniority Senior
Location Uzhgorod, Ukraine

Our most common engagement models

chart laptop scaled aspect ratio

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.

team job photo

Dedicated Development Team

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

woman with data dashboard

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
Case Studies

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

Has Upwork lost the battle with AI chatbots, or won them?
AI & ML

Has Upwork lost the battle with AI chatbots, or won them?

Is it possible that Upwork is just stimulating the development of chatbots in order to increase communication on its platform?
Yaroslav Kuntsevych
Yaroslav Kuntsevych
Upstaff vs. Upwork: Custom Development Services Comparison (2025)
Business

Upstaff vs. Upwork: Custom Development Services Comparison (2025)

Upstaff vs. Upwork: Vetted AI/Web3 speed vs. broad marketplace scale, fees, and bidding hassle
Yaroslav Kuntsevych
Yaroslav Kuntsevych
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
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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.