Meet Upstaff Team
JavaScript 10yr.
React 10yr.
Node.js 7yr.
AWS
Java
- 15+ years of experience in web development, M.Sc in Software Engineering, GAI, LLMs.
- Back-End: Java (Spring Boot, JavaCV + FFmpeg for media processing), Node.js, Next.js, TypeScript, PHP.
- Front-End: JavaScript & TypeScript (React, Angular, Vue.js).
- Mobile: React Native.
- AWS Cloud infrastructure, Lambda/Serverless, SNS/SQS Queues.
- 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.
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
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;
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.
$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
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.
C++
C
Linux Kernel
Embedded Linux
Python
- Senior Embedded C/C++ Engineer with 6+ years in embedded systems, IoT, and network protocol development
- Experience with embedded Linux, Linux kernel modules, and system-level architecture across Linux and STM32
- Develops software components and firmware in C/C++ and Python, including drivers, communication stacks, and control systems
- Skilled with TCP/IP, UDP, TLS, LWM2M, and real-time data pipelines; experience with low-latency video and telemetry systems
- Debugging and profiling skills (GDB, OpenOCD, Wireshark); works with cross-compilation, Yocto, and CI automation
Node.js
React
TypeScript
NestJS
- Software engineer with 6+ years in backend/fullstack development (Node.js, TypeScript, microservices), specializing in serverless architectures
- Domain expertise in Travel/Vacations and Payment/Banking systems, currently working at Guesty (data distribution channel management, Booking integrations, payment APIs)
- Built scalable distributed systems with AWS Lambda, Kubernetes, MongoDB, Kafka/RabbitMQ; aware of serverless limitations (compliance, DB coupling, cost)
- Experience with Java, Rust, Solidity; delivered MVPs quickly (Next.js, MongoDB) and onboarded clients efficiently
JavaScript
TypeScript
React
Node.js
PostgreSQL
- Full-Stack Developer with experience in Node.js, Nest.js, and Spring; React (pet projects with Vue).
- Backend expertise in microservices, MongoDB, PostgreSQL, and secure API design (OAuth, JWT, Webhooks). Experience with AWS, Azure, CI/CD, Docker.
- Domain experience: Fintech (SAAS Fintech/BI platform), and Healthcare (DUBAI, Event Management)
- Based in Tel Aviv, an Israeli citizen, open to on-site and hybrid work.
Java 7yr.
FHIR 3yr.
- Software Engineer with 9+ years of expertise in Java, Kotlin, and Spring Boot; DevOps and SRE, and Team Lead roles.
- 4 years with FHIR integrations (US Healthcare project until UA office lay-offs in 2022)
- Proficient in CI/CD pipelines, infrastructure as code (Terraform, Ansible), and monitoring tools (Prometheus, Grafana) with hands-on DevOps experience on OpenStack and cloud platforms.
- DB (MariaDB, MSSQL, MongoDB), messaging systems (RabbitMQ, ActiveMQ, Azure Service Bus), and integration with Shopify and FHIR standards.
- Holds a B.Sc. in Software Engineering
Azure DevOps
PowerShell
Azure
Kubernetes
- DevOps Engineer with 5+ years of expertise in automating Azure and hybrid cloud infrastructures using Terraform, Terragrunt, and Azure DevOps.
- Proficient in Kubernetes (AKS), containerization (Docker), and scripting with PowerShell, Bash, Python, and Go to enhance deployment automation and operational efficiency.
- Experienced in managing identity and access with Entra ID, hybrid AD, and securing cloud environments using Defender for Cloud, Sentinel, and CrowdStrike.
- Skilled in building and maintaining CI/CD pipelines with Azure DevOps, GitHub Actions, and GitLab CI, supporting scalable and reliable application delivery.
- Location: Poland, EU timezone
JavaScript
TypeScript
Node.js
React
- Full-stack engineer with 8+ years of experience specializing in JavaScript and TypeScript. Strong Computer Science background and a proactive, collaborative team player.
- Expertise in building complex cross-platform applications using React.js, React Native, Angular, Node.js (Nest.js, Express), and Java (JVM ecosystem, Gradle, REST APIs, Android tooling, API integrations).
- Developed AI-powered chatbots with Whisper & HeyGen, real-time messaging platforms, and serverless solutions using AWS Lambda, API Gateway, Cognito, and MongoDB (Mongoose).
- Skilled in Redux Toolkit, RxJS, responsive UI development, accessibility, performance optimization, refactoring, and CI/CD with Serverless Framework.
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.
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.
