Hire Vetted Web Application Engineers at Upstaff
All vetted software engineers you need to build AI, Web3, and data Products.
- Dedicated Full-time commitment for long-term or Time& Material for shorter or ongoing support
- Europe, Israel, LatAm, United States, Asia geography coverage
- Remote and hybrid engagement
- Trial period, no termination fees or hidden costs for transparent and risk-free onboarding.
Web Application
All
Web Application
Data and Analytics
Operations and Cloud
Mobile Application
Digital Platforms
Blockchain
Design and Creative
Quality Engineering and Testing
Delivery Management and Analytics
Desktop Software
Writing and Translation
Marketing and SEO
Scripting and Automation
Embedded Systems
Low-Code
GameDev
Industrial Engineering
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.
Senior
Kyiv, Ukraine
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.
Architect/Team-lead
Ukraine
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
Middle
Vinnitsa, Ukraine
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.
Senior
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
Senior
Uzhgorod, Ukraine
JavaScript 6yr.
TypeScript 6yr.
Node.js 6yr.
React 5yr.
Vue.js
• Strong front-end expertise across JavaScript/TypeScript, React, Vue, Next.js,Nuxt, understanding of UI/UX principles, responsive design, microservice and component architectures.
• Skilled in developing scalable SPA/PWA solutions, integrating complex front-end logic, and collaborating with backend services using Node.js, REST, SSR, Postgresql and CI/CD pipelines.
• Clean, maintainable code and transforming product requirements into user experiences.
• Contributed to enterprise-level platforms with advanced dashboards, real-time features, route-mapping components, performance optimizations, and long-term codebase improvements.
• Creative, detail-oriented full-stack engineer with 6+ years of experience building modern web applications.
Senior
Kyiv, Ukraine
$6500/month
Java SE
Java EE
JavaFX
PHP
JavaScript
• 11 years of practical experience in software development.
• Excellent experience with application engineering, architecting and development. Capable of analyzing, designing complex, high loaded systems, efficient resources management and problem solving. Quick learner of new technologies.
• Fluent English level.
Senior
Ukraine
JavaScript 7yr.
React 5yr.
Vue.js 2yr.
Nuxt
Node.js
• 7+ years with JavaScript and TypeScript
• Vue.js (Nuxt, Vuex, Vue Router)
• React (Redux, styled-components, MobX-state-tree, Next)
• Strong skills with HTML, CSS, SCSS, SASS;
• Server-Side: PHP (Laravel, WordPress), MySQL, MongoDB, NodeJS (CRUD, auth, base manipulations), NestJS. NextJS, Nuxt
• Upper-Intermediate (B2/C1) English.
Senior
Chernihiv, Ukraine
.NET
Azure
C++
React
- Full-stack engineer with 7 years of .NET, MS Azure, and JavaScript.
- Proven achievements include initiating and building a microservice architecture from scratch for data science computations and reducing latency by optimizing CPU-bound calculations.
Senior
Tallinn, Estonia
MS Dynamics 365
Power Apps
Microsoft Power Platform
Canvas Apps
- IT experience starting in 2015.
- Experience with the full lifecycle of designing, developing, installing, configuring, and maintaining applications on SharePoint 2007/2010/2013/2016/2019 Online. Nintex products (Workflows, Forms)
- Strong knowledge of .NET, C#, ASP.NET, HTML (HTML5), JavaScript, CSS (CSS3).
- Experience with Dynamics CRM, Power Apps, CDS, Power Automate, TypeScript, jQuery, Bootstrap (3, 4), Data Tables, SharePoint libs, ReactJS, React-Redux, Vue.js, Semantic UI.
- Extensive experience with MS Visual Studio 2012/2013/2015/2017/2019, VS Code, TFS, Jira, Git. Android, Windows Phone, Xamarin, Outlook Add-ins, Outlook framework, React Native, Parse Platform, Firebase.
- Upper-Intermediate English
Senior
Lithuania
Kotlin 5yr.
Java 5yr.
Ivan is a Lead Kotlin/Java Engineer with solid experience in backend and Android development. He builds reliable and maintainable applications, works well with cross-functional teams, and enjoys improving codebases and system architecture. Ivan is comfortable mentoring others and contributing to both mobile and backend projects, making sure they run smoothly and efficiently.- Software Engineer with 5+ years of experience in developing Android and backend solutions in the healthcare, fitness, and automotive industries;
- Strong Skills with Kotlin, Java, and TypeScript, creating Android applications on Jetpack Compose, Firebase, Android SDK, KMM, as well as backend solutions on Spring Boot (and basic experience with Node.js / React for integrations and prototypes);
- Experienced with AWS (Serverless, Lambda, S3, API Gateway) and GCP, builds cloud infrastructure, and is undergoing Google Cloud certification;
- Skilled with Firebase as a backend platform;
- Experience CI/CD, Docker, GitHub Actions, works according to Agile principles;
- Interested in implementing AI models in production solutions.
Senior
Lviv, Ukraine
Laravel 5yr.
Vue.js 5yr.
MySQL
* 7 years of experience in a Web Development team environment. Experience with Web Technologies: HTML5, CSS3, PHP, Symfony, Laravel, Javascript, Vue.js and jQuery.
* Working knowledge of Data Formatting Technologies: XML, XSL, and JSON. Experience with Web Servers: Apache and NGINX.
* Strong understanding of Utility Languages: FTP, SSH, Shell Scripting.
* Working knowledge of Content Management Systems: WordPress, modX. Experience with Common Development tools (Git, SVN, etc).
Senior
Zaporizhia, Ukraine
PostgreSQL 5yr.
REST 5yr.
TypeScript 3yr.
Python
Go
* Master’s Degree in Computer Science
* 19 years in Software Engineering: Python, Kotlin, Swift, C/C++, and TypeScript in software engineer, team lead, and software architect roles.
* Data processing with numpy, pandas, moving pandas, airflow, spark,and nifi.
* Designed and implemented a scalable multi-microservice backend for an enterprise AdTech CRM, integrating 10+ third-party services and streamlining client management operations.
* Built and deployed a billing system for a money exchange platform, integrating third-party payment systems and delivering a user-friendly web interface for seamless transactions.
* Optimized data processing pipelines by implementing quantiles on streams, enabling real-time analytics and supporting large-scale data operations for scientists and business stakeholders.
* Extensive background in data processing and reporting. Good abilities in SCM tools like Git, and in multi-threading and networking. Strong skills in Docker, gRPC;
* Cloud service platforms: AWS, Google Cloud, and MS Azure;
* Experience with DBMS, PostgreSQL, MySQL, MongoDB;
* Certificated knowledge of Blockchain;
* Certified Senior Go Engineer (12 years with GoLang).
Expert
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.
Middle
Ternopil, Ukraine
Scala
Software Engineer with proficiency in data engineering, specializing in backend development and data processing. Accrued expertise in building and maintaining scalable data systems using technologies such as Scala, Akka, SBT, ScalaTest, Elasticsearch, RabbitMQ, Kubernetes, and cloud platforms like AWS and Google Cloud. Holds a solid foundation in computer science with a Master's degree in Software Engineering, ongoing Ph.D. studies, and advanced certifications. Demonstrates strong proficiency in English, underpinned by international experience. Adept at incorporating CI/CD practices, contributing to all stages of the software development lifecycle. Track record of enhancing querying capabilities through native language text processing and executing complex CI/CD pipelines. Distinguished by technical agility, consistently delivering improvements in processing flows and back-end systems.
Senior
Ukraine
XSLT 10yr.
Python
XML
- 12+ years of experience in IT
- 10+ years of experience with XSLT
- Writing, testing and maintaining the XSLT code that applies some filtration and conditions on XML
- Converting IATA NDC Standard XML Content format into IATA NDC Standard XML format using XSLT
- Familiar with many processing engines like Saxon (Java) - libxslt (C) - Python’s package
- Upper-intermediate English
- Available ASAP
Senior
Cairo, Egypt
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
React 6yr.
React Native 2yr.
- 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
Senior
Ukraine
AEM
- 14 years of AEM experience in design, development, integration, and delivery of small to large-scale enterprise-level applications.
- An experienced solution architect with a keen interest in business domains, hands-on in technology-based solutions, and a strong focus on delivering measurable value.
- Industry Experience: Vast industry experience covering aviation, telecommunications, media, finance, retail, mutual funds, and services sectors.
- Technical skills: Best-in-class analytical and problem-solving skills with a track record of on-time and within-budget delivery.
- Soft skills: Ability to build strong personal and professional relationships using excellent interpersonal skills.
- E-commerce and AEM Expertise
- Certificated Adobe Experience Architect, Components Developer, ManagerAreas of expertise include:
- Digital transformations including Content Management Systems (CMS) like Adobe Experience Manager (AEM/CQ5).
- Application/Software development right from inception to implementation
- Implementation strategies, planning, and execution
- Agile methodologies such as continuous integration and continuous delivery, features/domain-driven development, extreme programming
- Worked with esteemed customers like ANZ Bank, Old Mutual Group (South Africa), Ford, Farmers Insurance, Aegon Insurance, LaQuinta, Cummins, and AT&T in consulting roles
- Fluent English
Senior
Melbourne, Australia
$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
JavaScript 5yr.
Web3.js
React
WebRTC
- 5+ years of experience as a Front-end JavaScript Developer;
- 5+ years of experience in React.js;
- Proficient in Solana Blockchain operations, including managing deposits, executing transfers, creating Phantom wallets, and handling contract call interactions;
- Strong abilities working with Web3;
- 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;
- Proficiency in testing frameworks like Jest and Cypress;
- E-commerce, web, and mobile applications, including learning platforms, chatbots, dApps, and cryptocurrency wallet extensions.
Senior
Castel San Giovanni, Italy
JavaScript 4yr.
Vue.js 2yr.
- 3 years of commercial experience, early projects since 2017. (Vue.Js, JavaScript, Chrome extensions)
- Has good knowledge of JavaScript, working with arrays, working with elements, sorting and data algorithms. Good understanding of HTML and CSS.
- Familiar with methodologies, principles, paradigms, and patterns in software development.
- Vuex for state management and Styled Components for styling.
- Rest APIs (Google, NovaPoshta) and Git for version control.
- Tailwind, Figma, and Webpack for UI
- Experienced in using Google Firebase, Cloud Firestore and Authentication.
Junior
Dnipro, Ukraine
Delphi 20yr.
React
Node.js
- Software Engineer with over two decades of experience, specializing in system design, and system integration (System Design, Technical Leadership, System Integration, Scalability, Security, Communication, Documentation);
- Strong abilities with React.js for building, interactive web applications;
- Experienced in Java, Spring Boot, and creating microservices;
- Skilled in Node.js for backend development;
- More than 20+ years of experience with Delphi, Deep knowledge with different versions of Delphi to 10.2;
- Experience with various localisations and Delphi UIs;
- Expert in various programming languages including C++, JavaScript, and Python;
- Experienced in database management with Oracle, MySQL, and PostgreSQL among others (Data Modeling Database Management, Normalization and Denormalization, Data Integrity, Data Warehousing, ETL, SQL and Query Optimization, Database Design, Stored Routines and Packages, Data Backup and Recovery, Data Migration, Web Scraping);
- Experience in technical leadership in various domains such as enterprise software, finance, and healthcare.
Expert
Ukraine
Node.js 10yr.
• 15+ years JavaScript programming
• Over 10 years in Node.JS programming
• Familiar with React.js
• Experience building highly scalable distributed web applications and browser extensions
• Extensive experience with REST services
• Strong communication and cooperation skills
• Solid experience as a Backend developer
• Fluent in English, written and spoken
• long Term experience in remote work with USA and Europien companies
• Self-directed person, with proven ability to manage goals and deadlines effectively
Expert
Belarus
Objective-C 10yr.
iOS 10yr.
C++ 10yr.
Swift 5yr.
- Served as a Senior Software Developer in the Two German Automotive Navigation Projects, focusing on System Team operations as well as Map and Routing domains.
- VPN and Network Filtering Development: Extensive experience developing VPN solutions, including cross-platform engines for KeepSolid’s VPN Lite, and expertise in low-level network filtering, proxies, and handling internet traffic.
- iOS Development Expertise: Over 10 years of hands-on experience with iOS development, including business apps and secure communication tools, with proficiency in Swift and Objective-C.
- C++ Proficiency: Strong background in C++ for developing core network functionalities, optimizing performance, and building cross-platform applications.
- Enterprise Application Development: Skilled in developing enterprise-level applications, including parental-style internet filters and device policy management tools.
- Agile Methodologies: Proven track record of working in Agile Scrum environments, delivering high-quality software with fast iteration and strong collaboration.
- Leadership and Team Collaboration: Experience as a Tech Lead, mentoring teams, and coordinating with stakeholders to resolve issues and implement new features.
- Available to start ASAP
Expert
Odesa, Ukraine
TypeScript
React
Node.js
JavaScript
PostgreSQL
- Senior Software Engineer with 7 years of experience building back-end and full-stack web applications. Worked on fintech, healthcare, and SaaS products;
- TypeScript and JavaScript. Experience with Node (Express, Koa, Fastify), React and Vue.js (including Vue 3), Nuxt, and Storybook; PostgreSQL schema design, and analytics-oriented querying.
- Operated containerized infrastructure with CI/CD;
- System design and implementation from the ground up with ownership from architecture to backend, frontend, and infrastructure; Authentication and role-based access control with stateless, security-first implementation details.
- Experience with multi-tenant platforms that require strict data isolation and have to meet GDPR and Swiss data protection requirements;
- Implemented and worked on highly regulated financial software and platforms, including MiCAR-compliant stablecoin platforms, blockchain integrations, as well as banking and SMTP integrations;
- Actively promotes accessibility and compliance standards (WCAG) and regularly participates in local meetups and hackathons. On-site hands-on product demos.
Senior
Switzerland
JavaScript 9yr.
Node.js 6yr.
Ruby 6yr.
Angular 5yr.
React 3yr.
Architect/Team-lead
Lahore, Pakistan
JavaScript 5yr.
Node.js 5yr.
React 5yr.
Vladyslav S. is a Senior JavaScript Developer with 6+ years of experience specializing in React.js, React Native, and Node.js. Experienced with AWS services (Lambda, ECS, RDS, DynamoDB), Firebase, Terraform, and CI/CD pipelines (GitHub Actions, Docker). Proficient in REST APIs, state management (Redux, MobX), and modern frontend frameworks like Next.js and Angular. Strong team collaborator with clean code practices and a focus on scalable architecture.
Senior
Ukraine
Python
TypeScript
Architecture and Design Patterns
Software Engineer with expertise in competitive programming, solving 1000+ problems on LeetCode/Codeforce, and demonstrated experience in architecting full-stack applications. Proficient in backend development with Python and Node.js, also skilled in mobile app development using Flutter. Track record includes developing high-performance RESTful APIs that handle 50K+ daily requests and implementing scalable FastAPI backends. Bachelor of Science in progress with a focus on software architecture, AI/ML systems from Adama Science and Technology University. Achievements include ranking 8th in ETCPC National Finals among 200+ teams and excelling in core programming languages and software development methodologies.
Senior
Adama, Ethiopia
JavaScript 5yr.
TypeScript 5yr.
Python 5yr.
SQL 5yr.
HTML5 5yr.
Full-Stack Engineer with 5 years of experience building end-to-end web applications, distributed systems, and modern frontend experiences. Deep expertise in TypeScript, Next.js, Node.js, PostgreSQL, and cloud-native architectures.
Known for shipping high-quality features fast, owning projects from concept to production, and collaborating effectively in remote, async teams. Comfortable with modern tooling, AI-assisted development workflows, and architecting reliable, scalable solutions used by thousands of users.
Senior
TypeScript 5yr.
JavaScript 5yr.
Node.js 5yr.
React 5yr.
Next.js
Software Engineer with 4 years experience, including FAANG tenure, excels in Web3, blockchain, and frontend technologies. Spearheaded development of high-traffic React and Next.js applications, enhancing performance metrics by 35%. Pioneered end-to-end decentralized solutions encompassing DeFi and NFT domains with strong proficiency in EVM, Solidity, and full-stack Web3 practices. Recognized for applying FAANG engineering standards to startup ecosystems, ensuring scalable and maintainable code. Holds a Bachelor's in Computer Science from Lviv Polytechnic National University, demonstrating a robust foundation in technical academia and a commitment to rigorous engineering methods.
Senior
Chervonohrad, Ukraine
Django REST framework 3yr.
UML 3yr.
VBA 3yr.
SAP Automation Training
Software engineer with hands-on experience in Python, Django, HTML, and CSS, adept at full-stack web development. Proven track record with a recent internship at CODECRAFT INFOTECH where practical application of E-commerce web application development was achieved. Robust educational foundation highlighted by an intern instructor role in Python and Django at Ahub Technologies Ltd. Certified in Information Technology with solid understanding of computer hardware and software from Tenim Press Business Center. Skilled in Excel, CorelDraw, and E-commerce applications, with a focus on training and skill development at Ahub Plateau. Looking to apply strong problem-solving skills and technical expertise in Python Developer and Graphic Designer roles.
Intern
Jos, Nigeria