Hire Vetted Web Application Engineers at Upstaff - Page 2
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
Cloud and Operations
Mobile Application
Blockchain
Design and Creative
Digital Platforms
Quality Assurance
Project Management
Desktop Application
Scripting and Automation
Marketing and SEO
Embedded Systems
Writing and Translation
Low-Code and No-Code
GameDev
Industrial Engineering
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.
$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.
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.
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.
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).
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).
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.
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
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
$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
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.
React
Next.js
TypeScript
Node.js
Upwork: 46 projects, $300,000+ earned, 100% Job Success and Top Rated Plus. I run 34+ production websites. Current https://zovo.one publishes 84 live Chrome extensions and 60,000+ users; these are owner-published figures. Websites, dashboards, Stripe checkout/subscriptions, API integrations, performance fixes and Chrome extensions are my focus.
C#
.NET
JavaScript
Scala
PHP
- 12+ years developing scalable enterprise applications using C#, .NET, Scala, and modern JavaScript frameworks.
- Expertise in building RESTful APIs, microservices, and cloud deployments with AWS and Docker.
- Led LMS platform development, integrating OAuth2 and SAML for secure single sign-on workflows.
- Strong background in database design with SQL Server, PostgreSQL, Oracle, and MySQL.
- Experienced in Agile methodologies, CI/CD pipelines, and mentoring development teams.
React 5yr.
Node.js 5yr.
TypeScript 5yr.
Next.js 2yr.
- Senior Full Stack Engineer with 15 years of experience delivering scalable solutions using React, Node.js, Next.js, and TypeScript for Amazon, Nike, Intuit, and more.
- Architected and shipped a GenAI chat platform featuring real-time SSE streaming and full WCAG 2.1 accessibility compliance.
- Expertise in frontend frameworks (React 15-18, Angular, Vue), backend APIs (NestJS, GraphQL, REST), and cloud infrastructure (AWS Lambda, EC2, S3).
- Strong testing discipline with Jest, Enzyme, Cypress, Karma; led multiple large-scale migrations and performance optimizations.
- Proven leadership in cross-functional collaboration, mentorship, code review standards, and end-to-end feature ownership.
WordPress 12yr.
PHP 12yr.
React 6yr.
Gutenberg 6yr.
WooCommerce 6yr.
- Architected and led full-stack WordPress projects with expertise in PHP, React, Gutenberg, WooCommerce, and REST API.
- Developed and maintained 10+ open-source WordPress plugins with modular, clean, and Gutenberg-native code.
- Delivered high-load, scalable platforms integrating CRM systems (Zoho, HubSpot, Salesforce) and headless architectures.
- Applied Domain-Driven Design, SOLID principles, Clean Architecture, and Agile methodologies in complex multi-vendor and B2B marketplaces.
- Specialized in AI workflow automation, multi-agent systems, and WordPress Abilities API for advanced plugin ecosystems.
Vue.js 4yr.
JavaScript 4yr.
TypeScript 3yr.
Full-Stack Developer with 4 years of experience in Vue.js, TypeScript, and NestJS. Core contributor to a platform with 1.3M+ monthly users, delivering end-to-end features from database to UI. Sole maintainer of open-source projects with 280K+ monthly users, including blockchain explorers and AI media platforms. Expertise in building scalable backend services with NestJS, Prisma, PostgreSQL, and Docker. Skilled in AI integration, async job queues, rate limiting, and complex UI components like TipTap WYSIWYG editor.
Python 6yr.
TypeScript 4yr.
Node.js 4yr.
React 4yr.
- Senior Full-Stack Engineer with 10+ years designing scalable SaaS platforms and agentic AI systems using Python, TypeScript, Node.js, and React.
- Expert in building tool-calling agents, RAG pipelines, and multi-step autonomous workflows leveraging LangChain, OpenAI, Claude APIs, and vector search.
- Proven track record in architecting robust backend services with FastAPI, PostgreSQL, MongoDB, and Docker, optimizing document processing time by over 50%.
C# 10yr.
Microsoft SQL Server 7yr.
.NET Core 5yr.
Blazor 3yr.
API 1yr.
- AI Engineer with 10+ years in .NET, specializing in LLM integration, multi-model AI agent platforms, and AI governance for high-liability domains.
- Expert in C#, .NET 8, Blazor, Azure, AWS, and microservices, delivering production APIs with sub-120ms response times at 150k+ daily requests.
- Architected AI-driven anomaly detection flagging 95% of fraudulent transactions and legal SaaS.
- Proficient in Clean Architecture, DDD, CQRS, SOLID principles, event-driven design, and prompt engineering with multi-provider LLM support.
- Experienced in cloud-native CI/CD pipelines, Docker multi-stage builds, Bicep IaC, and real-time messaging with SignalR, RabbitMQ, and Azure Service Bus.
Python 1yr.
Java
React
AWS
Node.js
Cloud-focused Software Engineer with practical experience designing, developing, and deploying scalable cloud applications. Skilled in cloud platforms, CI/CD pipelines, and microservices architecture. Adept at optimizing performance, automating workflows, and ensuring reliability and security of cloud systems. Experienced in collaborating with cross-functional teams to deliver complex projects on time. Passionate about leveraging modern cloud technologies to build efficient, maintainable, and high-performing software solutions.
Python 5yr.
React 4yr.
Node.js 3yr.
TypeScript 3yr.
- Full Stack Software Engineer with expertise in Node.js, Python, Go, React, and TypeScript, delivering scalable distributed systems and high-throughput APIs for millions of users.
- Proven experience designing event-driven architectures using Kafka, Redis, and microservices to optimize performance and reliability in large-scale platforms.
- Skilled in cloud-native development on AWS (EKS, Lambda, DynamoDB) with CI/CD pipelines, infrastructure as code, and observability tools like OpenTelemetry and Prometheus.
Python 5yr.
React 4yr.
Node.js 3yr.
TypeScript 3yr.
- Full Stack Software Engineer with expertise in Node.js, Python, Go, React, and TypeScript, delivering scalable distributed systems and high-throughput APIs for millions of users.
- Proven experience designing event-driven architectures using Kafka, Redis, and microservices to optimize performance and reliability in large-scale platforms.
- Skilled in cloud-native development on AWS (EKS, Lambda, DynamoDB) with CI/CD pipelines, infrastructure as code, and observability tools like OpenTelemetry and Prometheus.
.NET 22yr.
Java 7yr.
Kotlin 4yr.
Python 4yr.
Go 4yr.
- Over 30 years of software development experience in banking, financial services, and insurance sectors.
- Expertise in .NET, Java, Kotlin, Python, Golang, AWS, Azure, Angular, React, and DevOps tools.
- Proven track record as Software Architect and Tech Lead delivering scalable solutions using microservices, cloud architectures (AWS, Azure), and messaging systems (SNS, SQS, RabbitMQ).
- Strong background in Agile methodologies, Scrum, and software design patterns with hands-on experience in API development, Terraform, Kubernetes, and CI/CD pipelines.
- Led multiple international projects integrating complex systems for clients like Santander, BMW, Mastercard, Safra Bank, and Itaú Unibanco.
Java 8yr.
Spring Boot 8yr.
AWS 1yr.
Python 1yr.
- Senior Software Engineer with 10+ years in cloud-native enterprise systems using Java, Spring, AWS, and Kafka.
- Expertise in AI-driven production workflows, combining Python-based multi-agent systems with AWS Bedrock and retrieval-assisted generation.
- Led reverse-engineering and migration of a 6-million-LOC legacy retail system to Java microservices with optimized performance.
- Proficient in DevOps automation using Terraform, Helm, ArgoCD, Jenkins, and Kubernetes (EKS), enhancing CI/CD pipelines and infrastructure management.
- Strong background in secure backend development, identity federation, and scalable distributed systems with domain-driven design and TDD methodologies.
Solidity 1yr.
Foundry
Viem
WAGMI
Web3.js
- Senior Web3 Fullstack Engineer with 14 years of experience, specializing in Solidity, Foundry, Viem, Wagmi, and Ethers.js for dApp development.
- Led development of aescan.io, scaling it to 10K monthly users with advanced on-chain data visualizations and dashboards.
- Proven track record in building omnichain NFT lending platforms and integrating Web3 wallet connectivity and smart contract interactions.
- Experienced in agile methodologies, cross-functional collaboration, and delivering e2e-tested releases in blockchain environments.
- Computer science education with an Associate's Degree and ongoing advanced Web3 Solidity Bootcamp training.
Angular 8yr.
TypeScript 8yr.
Ionic 5yr.
RxJs 5yr.
NgRx 5yr.
- Senior Angular developer with 8+ years leading migrations from Angular 8 to 20, specializing in Standalone APIs, Signals, RxJS, and NgRx for scalable, high-performance applications.
- Proven track record in cross-platform Ionic apps, integrating Auth0, Google Maps, and Capacitor plugins to enhance native mobile experiences.
- Skilled in performance optimization techniques including OnPush change detection, lazy loading, SSR, and esbuild builds, improving load times by up to 50%.
- Computer Science graduate with strong engineering background, mentoring experience, and proficiency in TypeScript, Angular CDK, Storybook, Jest, and Cypress.
C# 6yr.
ASP.NET MVC 6yr.
Microsoft SQL Server 6yr.
ASP.NET Core Framework 3yr.
Redis 2yr.
- Senior Software Engineer with 5+ years in C#/.NET ecosystem, specializing in ASP.NET MVC, .NET Core, microservices, and SQL Server.
- Expertise in designing scalable systems using CQRS, Clean Architecture, Redis caching, Kafka streaming, and Docker containerization.
- Proven track record in modernizing enterprise SaaS platforms, achieving up to 60x latency reduction and 90% dashboard response improvement.
- Strong background in security remediation, OAuth2/OIDC/SAML authentication, and FedRAMP compliance readiness.
- Certified AWS Solutions Architect and Microsoft Azure DevOps/Developer with hands-on experience in cloud, CI/CD, and observability tools.
React 2yr.
Next.js 2yr.
Node.js 2yr.
Flutter 2yr.
- Full-Stack Engineer with expertise in React/Next.js, Node.js, Flutter, and PostgreSQL, delivering scalable web and mobile solutions.
- Proficient in AI integrations using OpenAI API, Stripe, MS Graph, and Telegram API, enhancing automation and user engagement.
- Led cross-functional teams and managed end-to-end project delivery, including real-time chat features and multi-tenant SaaS platforms.
- Strong background in software engineering with a Bachelor’s degree and hands-on experience in RESTful APIs, state management (BLoC, Redux Toolkit), and CI/CD pipelines.
- Recognized for technical excellence with Employee of the Year award and successful deployment of complex systems in production environments.
.NET 10yr.
C# 10yr.
Microsoft SQL Server 10yr.
AWS 3yr.
Azure 3yr.
- Senior .NET engineer with 10+ years in backend development, specializing in .NET 6–8, ASP.NET Core, and microservices architecture.
- Proven expertise in distributed systems, AWS (Lambda, ECS, API Gateway), Azure Functions, and event-driven processing with RabbitMQ and MassTransit.
- Led development of scalable platforms integrating multiple ATS and real-time notification systems using WebSockets and DynamoDB.
- Strong database skills in SQL Server optimization, Amazon OpenSearch, and DynamoDB, with experience in query tuning and indexing.
- Applied Clean Architecture, CQRS, and resilience patterns; implemented distributed tracing with OpenTelemetry and CI/CD pipelines using GitHub Actions.
PHP 9yr.
Node.js 6yr.
AWS 6yr.
- Technical Lead & Backend Architect with 10+ years in scalable backend systems using Node.js, PHP (Laravel, CodeIgniter), and AWS.
- Expertise in microservices, cloud-native architectures, and performance optimization, achieving 40% faster system response.
- Proven track record in legacy system modernization, API design, and integrating complex third-party services like Facebook and Google APIs.
- Strong leadership in mentoring engineering teams, enforcing code quality, and implementing DevOps best practices with Docker and AWS.
- Computer Science B.Tech graduate with extensive experience in database design (MySQL, MongoDB, Postgres) and real-time high-volume application development.
.NET 7yr.
Kubernetes 3yr.
React 2yr.
C#
- 7 years with C#/.NET, 3+ years with React.
- Hackathon Hack-a-Train Winner (2019), Startup Alley participant, IT Arena (2019), Team lead for 1.5 years.
- A problem-solver: System Design, Performance Optimization, Reliability, Production Troubleshooting, from monolith to microservice architecture.
- AWS and Azure clouds, Kubernetes, messaging systems (RabbitMQ, Kafka), caching (Redis).
- Agentic AI systems, RAGs, LLMs, integrated AI services (OpenAI APIs, Azure AI Vision)
- 3 years in the Healthcare domain: AI disease predictions and other AI-assisted tools
- 4 years in enterprise CAD/CAM for industrial and medical manufacturing.
- Personal project for English learners (Mobile, Web, Desktop)
Python
Angular
TypeScript
- Senior Full Stack Engineer with 6+ years of experience with Python applications;
- Angular, React, and VueJS (pet) JavaScript Frameworks. Also TypeScript for Node.js and NestJS;
- Led architecture and full lifecycle development for AI-powered, IoT-integrated, and subscription-based SaaS platforms;
- Expertise in real-time communication, API design, database optimization (PostgreSQL, MongoDB), and payment integrations (Stripe);
- Implemented LLM-based AI workflows enhancing code generation, debugging, and CI/CD pipelines using GitHub Actions and GitLab CI;
- Automation: Playwright (end-to-end), Pytest, Unit Tests
C#
ASP.NET Core Framework
React
AWS
- 7 years in a Full-Stack Engineer role with experience in web apps (C#, ASP.NET Core, React, SQL), AWS, and Azure.
- Developed and maintained enterprise web applications for the healthcare industry for 4 years.
- Enterprise contact center platform for call recording analysis, quality assessment, and analytical data visualization - 1 year
- Expertise in microservices and micro-frontend architectures (Webpack Module Federation).