Meet Upstaff Team
Python 5yr.
Django 3yr.
Mobile development
Flask
API
- Ranked among the Top 10 local freelance Python engineers at the age of 17.
- Contributed to projects with a multi-million user base, focusing on backend scalability and production stability.
- Successfully launched and supported a USA educational platform used by students, tutors, and academic institutions.
- Represented the development team at the international Wefi Beyond Banking Summit, presenting a fintech product to a global audience.
- Built and maintained production-grade backend systems, automation tools, Telegram bots, and API integrations for fintech, crypto, payments, and business operations.
JavaScript 10yr.
React 10yr.
Node.js 7yr.
React Native 2yr.
Java
- 15+ years of experience in web development
- Front-End: JavaScript & TypeScript (React, Angular, Vue.js).
- Mobile: React Native.
- Back-End: Java (Spring Boot, JavaCV + FFmpeg for media processing), Node.js, Next.js, TypeScript, PHP.
- AWS Cloud infrastructure, Lambda/Serverless, SNS/SQS.
- Unit testing, integration testing, testing automation frameworks and tools
- M.Sc in Software Engineering, GAI, LLMs.
- Experience leading and mentoring a team of developers, including assigning tasks, providing guidance, and ensuring the team's success. Conducting assessments and interviews. Ability to motivate and train team members, resolve conflicts, and providing 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;
$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# 7yr.
Xamarin 7yr.
.NET MAUI 5yr.
Kotlin 1yr.
Swift 1yr.
- 11+ years in native iOS (Swift), Android (Kotlin), and cross-platform (.NET MAUI, Xamarin) mobile development.
- Expert in platform migration (Xamarin to .NET MAUI, PCL to .NET Standard) and performance optimization.
- Proficient in MVVM architecture, RESTful APIs, custom controls, and AI-assisted development tools.
- Collaborated with international teams, notably German engineering teams at Miele and IBM Romania
- Engineering diploma in Electrical Engineering, skilled in C#, C++, .NET technologies, and DevOps tools like Git and Azure DevOps.
ASP.NET 10yr.
Xamarin 6yr.
.NET MAUI 6yr.
React Native 6yr.
.NET Core 6yr.
- Technical Team Lead with 16+ years in .NET, MAUI, Xamarin, React, and VueJs, leading mobile and web projects.
- 20 mobile apps in production.
- .NET MAUI since 2022 (NET 6). Published a book about .NET MAUI.
- Expertise in CI/CD, ASP.NET Web API, MVVM, N-tier architecture, and cross-platform mobile development.
- Strong background in software engineering principles and best practices, driving high-quality code and team productivity.
- Fluent in Romanian, English, and Italian, with experience in international project collaboration.
Java 25yr.
Python 5yr.
AWS 5yr.
Agentic AI 1yr.
- Technology leader, Solution Architect, hands-on builder, and founder with 25+ years of experience designing and building software products and platforms across Agentic AI, cloud, automation, and workflow orchestration, Agentic AI, LLM orchestration, workflow automation, SaaS, and cloud platforms.
- Hands-on Solution Architect, CTO, Founder, Principal Architect, and Developer specializing in Agentic AI, LLM orchestration, workflow orchestration, durable execution, cloud architecture, distributed systems, and product platforms.
- Worked at startups and enterprises (IBM, Automation Anywhere, Stanford University)
Xamarin 9yr.
.NET 9yr.
SQLite 9yr.
.NET MAUI 4yr.
AWS
- Engineer with 9+ years in mobile app development using Xamarin, Xamarin.Forms, and .NET MAUI, delivering cross-platform solutions for US, UK, and UA clients.
- Expertise in MVVM frameworks (MvvmCross, MvvmLight) and database technologies including SQLite and Realm.
- Proven track record leading teams and architecting scalable apps with CI/CD pipelines using Jenkins, AppCenter, and Azure DevOps.
- Azure, AWS, and GCP cloud services
- Experience integrating complex payment systems (Stripe, ACH, PayPal) and backend services with REST APIs and EFCore.
Agile
RAG
Agentic AI
AI workflows
LLMs
- AI product & transformation lead | 8+ yrs product ownership, BA, enterprise delivery & AI workflows. Driving AI products & adoption at Rivian and Volkswagen Group Technologies (discovery→pilot→rollout→optimization).
- Expertise: process mapping, AI use-case prioritization, trade-offs, measurable adoption.
- Hands-on: agents, prompting, RAG, tool-use, workflow automation, evaluation, low-code prototyping.
CORE SKILLS AI
- Transformation: process mapping, use-case prioritization
- Agentic AI & LLMs: agents, prompting, RAG, tool-use, rapid prototyping
- Product & Delivery: roadmaps, PRDs, stories, ACs, Agile/SAFe
- Eval & Adoption: quality, enablement
- Leadership: workshops, alignment, exec comms
Databricks 5yr.
Azure Data Factory 2yr.
PySpark 2yr.
AWS Glue
SQL
- Over 6 years of experience with high-volume data platforms (PySpark, Databricks), and orchestrating pipelines with Apache Airflow and Azure Data Factory. AWS and Azure cloud services for ELT processes.
- Delivered consulting services for Banking (Santander), Retail (Mango, Zalando), Insurance (Reale Seguros), and Industry (Telefónica, Técnicas Reunidas) on Databricks Lakehouse adoption and data platform strategy.
- Strong background in ML model industrialization, ETL processes, and optimization of Spark configurations
- Hosted the first Databricks User Group Meetup in Madrid and attended the DAIS 2025 in San Francisco.
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.