Hire Vetted Web Application Engineers at Upstaff

• Front-end JavaScript Engineer with 9 years of commercial experience;
• 8+ years of hands-on experience with React, and TypeScript, including complex component architectures, shared UI libraries, and micro-frontend approaches using Module Federation;
• Experience with automated testing, covering unit, integration, and end-to-end tests using Jest, React Testing Library, Cypress, and Playwright;
• Experience with Next.js, focusing on performance optimization, scalability, and modular application design;
• Expertise in Web3 and blockchain integrations, including crypto wallets, on-chain data, and decentralized authentication;
• Background in FinTech and crypto products, delivering secure, user-facing interfaces for wallets, cards, and transaction flows;
• Experience working and leading within distributed Agile teams, collaborating closely with backend, security, and product stakeholders.

• 8+ years of experience in software development with a focus on JavaScript, TypeScript, and full-stack engineering;
• Computer Science Education: A reliable and collaborative team member with a proactive approach to problem-solving 
• Developed cross-platform interfaces, including AI-powered chatbots with Whisper and Heygen, and real-time messaging platforms;
• Built complex web applications using React.js, React Native, Angular, and View.js (pet) across edtech, healthtech, e-commerce, and banking projects; Worked with Redux Toolkit, RxJS, Nest.js, and Express for state management and backend logic;
• Delivered serverless APIs using AWS Lambda, API Gateway, Cognito, and integrated MongoDB via Mongoose;
• Built and maintained responsive UIs with accessibility, mobile support, and data visualization features; performed performance optimization, refactoring, bug fixing, and CI/CD using the Serverless Framework;

• 10+ years of experience designing and leading complex software solutions in fintech, AI, and payment systems, with expertise in JavaScript, TypeScript, Node.js, Python, Kubernetes, AWS and GCP services.
• Computer science education with applied physics and software development degrees, combined with hands-on expertise in DevOps, CI/CD pipelines, and advanced testing methodologies (TDD, BDD). Deep knowledge of software design principles, event sourcing, REST/GraphQL APIs, container orchestration, and secure, high-performance distributed systems.
• Architecting scalable, event-sourced payment hubs, AI-driven platforms, and multi-modal AI assistants using microservices, FastAPI, LangGraph, and Terraform.

• Full-Stack Developer with 8+ years of extensive technical expertise in frontend and backend development, UI/UX architecture design, and team leadership.
• Demonstrated a solid ability to deliver scalable, performant, and user-centric solutions across various industries, including e-commerce, gaming, real estate, education, and healthcare.
• Proficient in modern JavaScript frameworks, including ReactJS, VueJS, and AngularJS, with expertise in state management libraries like Redux, MobX, and React-Query.
• Expertise in TypeScript for building scalable and type-safe front-end applications. - Skilled in UI/UX design systems, including creating reusable component libraries with tools like Storybook, Material-UI (MUI), and Chakra-UI.
• Proficient in Node.js, developing RESTful and GraphQL APIs with frameworks like Express, Koa, and Strapi.
• Extensive experience in database management, including PostgreSQL, MongoDB, Firebase, and RethinkDB.
• Skilled in building microservices architecture, optimizing server-side performance, and ensuring scalability.
• Has experience with cloud deployments, utilizing AWS, Heroku, Netlify, and DigitalOcean.

• 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.

• 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.

• 12+ years of experience in full-stack software development with a strong focus on .NET Core, C#, and Microsoft Azure ecosystem;
• Built complex enterprise applications and scalable microservices architectures using ASP.NET Core, Azure Functions, Docker, RabbitMQ, and MS SQL Server;
• Developed cross-platform web and mobile applications using React, React Native, and Node.js for industries including healthcare, logistics, education, social networking, and B2B platforms;
• Built native apps on Windows, macOS, iOS, and Android with .NET Multi-platform App UI
• Designed and integrated REST APIs and real-time messaging features for high-performance systems;
• Delivered cloud-native solutions with Azure Web Apps, Azure Storage, CI/CD pipelines, and microservice orchestration;
• Led architecture design, team collaboration, and technical mentorship across multiple full-cycle delivery projects;
• Experienced in building customer-centric solutions, data-driven dashboards, and scalable CRM-like platforms.

• 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

• 7+ years of expertise in frontend and mobile development with a strong command of ReactJS, React Native, and TypeScript, delivering scalable cross-platform applications.
• Proven leadership in architecting solutions, leading React/React Native teams, and driving technical decisions aligned with product and design goals.
• Hands-on experience with modern web and mobile technologies, including Next.js, Redux, REST API, GraphQL, and native Android/iOS modules.
• Skilled in CI/CD pipelines, code quality tools (Eslint, Prettier, SonarQube), and testing frameworks (Jest, Detox, Playwright), ensuring robust software delivery.
• Master’s degree in engineering from a technical university, with a solid foundation in software development lifecycle, Agile methodologies, and responsive, accessible UI design.

• Senior Software Engineer with 8+ years of experience in fintech, e-commerce, SaaS, and healthcare, specializing in scalable backend and frontend solutions using Node.js, Python (Django), React.js, and AI frameworks like LangChain.
• Proven expertise in designing high-performance REST APIs, secure AWS Cognito SSO integrations, and optimizing system efficiency by up to 40% through caching, indexing, and query optimization.
• Strong background in cloud services (AWS Lambda, Cognito), database management (PostgreSQL, MongoDB, Redis), and modern DevOps practices including Azure DevOps and Docker.
• Experienced in AI-driven feature integration, multi-regional third-party service orchestration, and mentoring teams to deliver business-critical systems in agile, distributed environments.
• Holds a B.Sc. in Computer Engineering, with advanced certifications in ReactJS and NodeJS, and fluency in multiple programming paradigms and secure software design principles.

Senior Full-Stack Engineer with 17+ years of experience in versatile enterprise-grade projects for large service companies (Ciklum).

SOLID principles, OOP, and component-based design in cloud environments, CI/CD pipelines, and performant user interfaces used by large-scale applications:

• Back-End: Node.js, Next.js, PHP;
• DB: SQL (relational MySQL and PostgreSQL) and NoSQL;
• Front-end: JS/Typescript, React, Angular, Vue.js (pet); TanStack Query/Router, performance optimization;
• Cloud deployments on Azure, Vercel, and Netlify, CI/CD pipelines.

• Over 15 years of professional experience in web development with expertise in PHP, MySQL, JavaScript, HTML, and CSS, delivering robust back-end solutions and system maintenance.
• Strong foundation in Computer Engineering and Computer Science, holding a Bachelor’s degree and an Associate of Science degree, ensuring solid technical and theoretical knowledge.
• Proven ability to design and deploy critical database systems, including a humanitarian regional air transport management system, demonstrating skills in database design and application development.
• Experienced in full software development lifecycle (SDLC) practices, including system design, development, deployment, and maintenance across diverse sectors such as humanitarian aid and education.
• Bilingual proficiency in Portuguese and English, facilitating effective communication in international and remote work environments.