Hire Vetted Web Application Engineers at Upstaff - Page 1

• 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.

• 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.

- 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.

- 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

- 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

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.

* 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).

10+ years of experience in web development, M.Sc in Software Engineering, GAI, LLMs Front-End: Angular, React, Vue.js (JavaScript & TypeScript) Back-End: Node.js, Next.js, TypeScript , PHP Mobile: React Native AWS Cloud infrastructure 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. Ability to motivate and inspire team members, resolve conflicts, and provide constructive feedback. Experience conducting assessments and interviews remotely.

* 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).

- 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.

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.

- 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

- 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

- 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

- 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

- 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

- 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.

- 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.

- 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.

• 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

- 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

- Experienced software engineer with over 12 years in the IT industry, specializing in system architecture, full stack development, and cloud deployment, predominantly in AWS. - Strong proficiencies in backend technologies including Python, PHP, Node.js, Java, and web frameworks such as Django, Laravel, and CakePHP. - Demonstrated experience with both SQL and NoSQL databases, adhering to best practices in database management and data-driven application development. - Proficient in orchestration tools like Kubernetes and Docker, enabling efficient CI/CD pipelines and application deployment. - Recognized for academic excellence with a Master’s in Applied Software Development and awards such as 'Student of the Year'. - Proven track record of leading and completing complex projects, reflected in an extensive project portfolio encompassing various domains and technologies.

Software engineering professional with over 14 years of experience in full-stack development. Versed in a range of technologies including C#, JavaScript, Python, .NET Core, and cloud services like Azure. Proven capability in leading teams and optimizing applications, achieving up to a 40% improvement in performance metrics. Holder of relevant certifications like Azure DevOps Engineer Expert and Azure Administrator Associate. Recognized for exceptional contributions with multiple awards, showcasing a commitment to innovation and excellence in software delivery within the IT industry.

• 6+ years of experience in reverse engineering and security analysis of iOS and Android applications, including authentication, password reset, OTP, and account recovery flows; • Experience with static and dynamic analysis using Frida, JADX, IDA/Ghidra, Hopper, Burp Suite, and mitmproxy, including hooking runtime behavior, traffic interception, and analysis of obfuscated code paths; • Understanding of network protocols, API behavior, session handling, token flow inspection, and secure communication patterns in mobile systems; • Skilled in bypassing anti-debugging protections, inspecting native components, and analyzing undocumented logic in React Native, Swift, Kotlin, and mixed-architecture apps; • Experienced of mapping complex authentication workflows, documenting mobile security mechanisms, producing technical reports, diagrams, and vulnerability-focused flow descriptions; • Experience optimizing backend/mobile integrated flows with PostgreSQL, caching, throttling, and performance tuning in high-load financial and administrative mobile apps; • Skilled in mobile application security analysis across fintech, art commerce, and critical operations platforms, including real-time traffic inspection and security hardening; • Effective communicator with experience collaborating with product, operator, and engineering teams through RFCs, status updates, and structured documentation.

Software engineer with a solid foundation in front-end development, expertly handling React, TypeScript, and JavaScript (ES2015-2019). Proven experience in deploying robust web applications using Redux, Zustand, and state-of-the-art web technologies. Demonstrates a keen eye for UI/UX design implementing Figma creations into functional user interfaces, coupled with strong backend competencies in Node.js, PostgreSQL, and MySQL. Adept at utilizing development tools such as Git/GitHub, VS Code, and NPM for efficient project management and collaboration. Brings a strong work ethic and problem-solving skills to development teams, with a history of driving project success from conception to deployment.

Software engineer with a Bachelor's degree in software engineering and over 6 years of professional experience in developing web, mobile, and desktop applications. Emphasizes technical expertise in a range of programming languages including Typescript, Javascript, C#, Java, HTML/CSS, Python, Visual Basic, and C++. Experience with modern technologies and frameworks like Angular, Ionic, .NET Core, Vue.JS, and React. Skilled in various databases such as Microsoft SQL Server, Postgresql, Firebase, MySQL, and Mongo DB. Demonstrated ability in leading teams as an eCommerce Tech Lead and facilitating process automation using AI. Proficient in multiple operating systems, version control systems, and has engaged with cloud services including AWS. Known for strong skills in decision-making, leadership, and a capability to learn independently, showcased through continuous career progression from junior developer to technical leadership roles.

An accomplished front-end engineer with a solid foundation in Computer Science from UNAD University and over 6 years of professional experience, including 4 years as a Senior Front-End Developer at Adastra. Demonstrates advanced proficiency in React.js, Redux-Saga, Vue.js, Angular.js, and modern web development with a proven track record of leading the development of scalable, responsive, and high-performance web applications. Notable achievements include spearheading a migration to microservices architecture, yielding a 40% reduction in system downtime. Possesses in-depth knowledge of cloud services (AWS), CI/CD methodologies (Jenkins), and containerization (Docker). The engineer's programming toolkit encompasses a diverse set of languages and utilities such as Typescript, Docker, and Node.js, as well as experience with blockchain technologies like Solidity and web3.js, enabling the delivery of comprehensive end-to-end web solutions.

- Have experience in programming Spring Framework. - Have experience with Microservices architecture. - Practice with Elasticsearch (Kibana); - Experience in the fintech sphere; - Understanding of “Clean code”; - Good logical thinking, self-learning, high level of responsibility. - Responsible, hard-working, result-oriented, creative, and communicative, team player. - Intermediate English. - Availability starting from Asap

Software engineer with over 3 years of professional experience at COMSATS University Islamabad, specializing in Python, Django, and JavaScript. Notable for developing a complete Queue Management System to enhance university operations. Expert in Bootstrap, assisting with UI/UX design, backend logic, and data management. Proficient in conducting quality assurance and regression testing on complex web applications such as the Student Fee Management System. Holds a diploma in Graphic Design, contributing to a strong foundation in UI/UX principles. Capable of translating departmental requirements into effective technical solutions and maintaining system reliability for various university system modules.

Computer Science graduate with a record of developing full-stack systems to combat web misinformation, leveraging technologies such as LangChain, FastAPI, and MongoDB. Engineered secure REST APIs in Node.js with JWT for the SplitSmart App, optimizing database performance and spearheading documentation. Conceived a mental health mobile app with real-time chatbot support in Flutter, demonstrating user-experience acumen. Compiled practical experience as a Mobile Money Agent, evidencing proficiency in transaction handling and regulatory compliance. Academically grounded from the University of Malawi, with engagement in leadership roles and proactive community development. Well-versed in Python, Java, JavaScript, along with AI/ML, this candidate is poised for tackling complex challenges in backend development, API design, and system integration.

- 10+ years of experience in full-stack .NET development across fintech, healthcare, insurtech, and SaaS domains; - Expertise in backend engineering with .NET Core/.NET Framework, microservices, high-load systems, and cloud-native architectures (Azure, AWS); - Full-stack experience with React.js, REST/SOAP services, Web API, and Windows Services; - Experienced with MS SQL, PostgreSQL, MongoDB, Oracle, Redis, and Elasticsearch, including performance optimization and reliable data-driven solutions; - Skilled in distributed systems using Kafka, Docker, and modern CI/CD practices via Azure DevOps; - Experienced in integrating external systems, building scalable APIs, and delivering complex enterprise workflows for banking, CRM, and healthcare platforms; - Strong background in Agile/Scrum, TDD, cross-functional collaboration, and architecture decision-making; - Solid foundation in C#, JavaScript, SQL, and cloud services (Azure Functions, CosmosDB, Blobs, AWS S3).