Meet Upstaff Team
JavaScript 8yr.
React 8yr.
TypeScript 5yr.
Node.js 5yr.
AWS
- 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.
Architect/Team-lead
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
Senior
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;
Senior
Ukraine
Python 5yr.
Django 3yr.
Mobile development
Flask
API
- Python Developer with 6+ years of experience in backend development and automation: Django (4 years), Flask, and Fast API for web application development;
- Built and supported Telegram bots and automation tools for business operations (dApp Marketplaces, Crypto ATMs, Payments and Casino games)
- Maintaining and supporting production systems using FastAPI and SQLAlchemy, API integrations including financial services and crypto platforms;
- 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.
Middle
Ternopil, Ukraine
$55/hr
$8000/month
$8000/month
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
Senior
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.
Senior
Ukraine
.NET
React
Angular
- Full-stack web developer with more than 9 years of commercial experience.
- Has worked on a wide range of projects, including financial remittance systems, medical appointment websites, and payment systems for electronic document exchange services.
- Has experience working with a range of technologies including ASP.NET Core, .NET Core, EF Core, TypeScript, Node.js, Microservices, Kafka, Azure, AWS, Angular, React, Vue.js, and WPF.
- Strong bug-fixing skills and experience with DevOps responsibilities.
Senior
Lviv, Ukraine
Node.js 5yr.
TypeScript 5yr.
PostgreSQL 5yr.
Python 4yr.
- Software engineer with 20+ years of experience specializing in Node.js (TypeScript) and Python, architecting microservices and event-driven systems using Kafka/Redpanda, ClickHouse, and PostgreSQL.
- Official Oracle Contributor, Active community events/meetups organizer, and open source projects contributor
- Proficient in designing scalable APIs with gRPC, tRPC, and Protobuf, implementing CI/CD pipelines with GitLab CI/GitHub Actions, Docker, and Terraform.
- Holds a Bachelor’s degree in Automation and Computer Technologies. Strong background in system design, cloud-native architectures, and observability practices, including structured logging, metrics, and tracing.
Senior
Warsaw, Poland
Node.js
TypeScript
AWS
React
- Full-stack software engineer with an MS degree in Computer Science;
- Designed and operated event-driven, cloud-native architecture.
- Back-End: Node.js, NestJS, Express (8 years); SQL/NoSQL DBs, performance optimization, data processing (Python), ML pipelines, CI/CD DevOps practices. Wide experience with Databases (MongoDB, PostgreSQL, MySQL, DynamoDB, etc.);
- Front-End: React (including forms, dashboards, admin tools), 6 years.
- Unit and E2E tests (Karma, Jest, Cypress, Playwright)
- Expert in serverless AWS architecture: Lambda functions, asynchronous message queues SQS, RabbitMQ; Ownership from requirements to production in serverless/event-driven B2B systems.
- Built demand forecasting with TimeGPT, TimesFM, TiREX; integrated Python ML pipelines into NestJS via RabbitMQ; implemented an AI chatbot for inventory insights and recommendations (using LangChain principles)
- Developed an AI-powered inventory & demand planning platform for e-commerce merchants; built a multi-tenant CRM for service companies and a real estate platform with direct customer requirements integration.
Senior
Poltava, Ukraine
JavaScript 6yr.
Node.js 5yr.
PostgreSQL 3yr.
Vue.js 2yr.
React 2yr.
- 6+ Years of Software Engineering Experience (full-stack) with scalable architectures, clean APIs, and responsive interfaces. Communication skills and a product mindset. Ownership mentality - comfortable taking a feature from idea to production. Ownership mentality - comfortable taking a feature from idea to production.
- Experience working with AI or LLM-based applications, B2B or enterprise customers, including for fintech and crypto applications using JavaScript, Node, NestJS, React, and PostgreSQL.
- Optimized database interactions and workflows in corporate platforms with AWS Neptune, DynamoDB, Elasticsearch, and Redis, and 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. Integrations with multiple payment providers and API gateways, resulting in scalable architectures handling diverse data formats.
- Integrated monitoring tools like Prometheus and Grafana in deployment pipelines using GitLab CI, enabling metrics collection for endpoints and integrations in real-time services.
Senior
Bialystok, Poland
Python
AWS
Kafka
Apache Airflow
Snowflake
- 8+ years of experience as a Data Engineer, Data QA, and Data Science challenges. - AWS Certified Data Analytics.
- Experience creating and supporting of ELT data pipelines built on Snowflake and DBT
- Warehousing models, and support existing processes/ETL’s (extract/transform/load), functions (in Python/SQL/DBT) in a cloud data warehouse environment using Snowflake, AWS services
- Software developer with good communication and organizational skills.
Middle
Ternopil, Ukraine
Azure 5yr.
Python 4yr.
Databricks
Apache Airflow
- 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.
Senior
Warsaw, PolandOur 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.
Frequently Asked Questions
What is Upstaff?
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?
Our developers can start immediately or within two weeks after the project is confirmed.