Hire Vetted Web Application Engineers at Upstaff - Page 3

Senior Backend Software Engineer with over 5 years of experience in software development, specializing in system architecture and backend solutions across various industries. Holds a B.Sc in Computer Science and professional certifications such as Microsoft AZ 900 and an IBM mastery award. Expertise in developing asynchronous backend systems using NestJS, enhancing application performance with technologies like AWS SQS, Lambda, and implementing multi-queue architectures. Proficient in building scalable microservices with integrated payment and analytics features, utilizing Stripe API, and blockchain technology. Demonstrated capability in optimizing APIs, designing serverless architectures, enabling continuous integration/deployment, and ensuring system compliance and security. Strong proponent of best practices in software development lifecycle, possessing hands-on experience with Kafka, gRPC, Kubernetes, Elasticsearch, and CI/CD pipelines.

Software engineer with over 5 years of development experience, specializing in blockchain platforms, DeFi, and DApps. Demonstrates expertise in Ethereum ecosystem (DEX/CEX integrations, GameFi, lending, RWA, wallets, ZK systems), and diverse blockchain technologies such as Bitcoin, Stellar, and StarkNet. Key competences include Solidity development, smart contracts audit, crosschain NFT systems, and proposing standards like ERC-8006. Possesses advanced knowledge in backend engineering utilizing technologies like Node.js, Python, and .NET, with a strong foundation in computer science from Kharkiv National University of Radioelectronics. Skilled in Full SDLC, devises encryption solutions (zk-proof, homomorphic), and excels in developing auxiliary tooling and technical documentation. Active in OSS, contributing to security (Slither, Echidna, Manticore, Mythril) and infrastructure projects (AWS, DigitalOcean, Heroku).

Proven Software Engineer with robust academia in Intelligent Systems & Software Engineering, adept in Python, Java, and AI/ML technologies. Offers hands-on experience in AI model training and software development, with expertise in algorithm optimization and system design. Noteworthy involvement in developing an AI-augmented code optimization framework and a performance predictor project during BSc. Combines technical prowess with data annotation and model evaluation finesse, poised to thrive in AI innovation.

- 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).

- Full-stack web developer with more than 9 years of commercial experience. - Has worked on a wide range of projects, including financial remittance systems, medical appointment websites, and payment systems for electronic document exchange services. - Has experience working with a range of technologies including ASP.NET Core, .NET Core, EF Core, TypeScript, Node.js, Microservices, Kafka, Azure, AWS, Angular, React, Vue.js, and WPF. - Strong bug-fixing skills and experience with DevOps responsibilities. - Upper-Intermediate English

- Full-Stack .NET Engineer with 16 years of experience developing innovative products and leading teams and companies in the IT sector. - Has 6+ years of experience working with payment systems integrating MasterCard, Visa, Payoneer, and PayPal into the user's programs. - Has 4 years of experience with Sitecore in different domains like Hospitality, Tourism, and Automotive. - Expertise in system architecture, analytics, optimization, DevOps - Proficient in C# and .NET framework, with extensive experience in ASP.NET Core, Blazor, and Electron.NET. - Strong background in implementing DevOps practices, including continuous integration and continuous deployment (CI/CD), version control using Git, and automation with tools like Jenkins and Azure DevOps. - Led and managed teams in various roles such as Team Lead, Architect, and DevOps. Demonstrated leadership skills in defining goals, assigning tasks, and ensuring project success.

- 10+ years with Salesforce (mostly B2C Commerce), I have successfully built topnotch back-end and front-end for various e-commerce websites, - improved Salesforce solutions for clients, and created many integrations in small and large teams. I have experience as a Salesforce developer with Service, Sales, Financial Services, Communications, and Marketing Clouds. - Past projects include developing solution approaches for diverse tasks such as integrating all import/export jobs with the client's SFTP servers, integrating third-party services using a services framework, LINK integrations, and building custom integration cartridges for payment processors like Adyen and Rakuten.

- Senior Full-Stack Engineer with over 8 years of industry experience and a solid educational background with a Bachelor's degree in Computer Science from Holy Angel University. - Expertise in a wide range of programming languages (JavaScript, TypeScript, PHP, Java, Python, Golang, C#) and frameworks (React, Next.js, Vue, Node, Laravel, Django), enabling versatile full-stack development. - Proficient in modern DevOps and cloud technologies (Docker, Kubernetes, AWS, GCP), AI & ML implementations (PyTorch, TensorFlow), and creating responsive front-end applications that improve user experience. - A track record of building and maintaining large-scale, AI-integrated applications, such as a consumer savings app with 20,000+ active users. - Strong grasp of databases (MySQL, PostgreSQL, MongoDB, Firebase, Redis) and proficiency in Version Control (Git), improving collaboration and SDLC efficiency. - Demonstrated ability to drive projects from concept to deployment, with an emphasis on clean code, automated testing, and CI/CD practices.

Software engineer specializing in scalable React applications, with a robust engineering background in microelectronics and applied physics. Experienced in working with international teams, the engineer boasts a track record of successful frontend development across EdTech and enterprise domains. Notable technical competencies include mastery of JavaScript (ES6+), TypeScript, React.js, Next.js, and performance optimization. Key achievements include A/B Testing for UX enhancement, leading API integrations and performance boosting initiatives. Armed with Agile methodologies, the candidate has effectively communicated and coordinated within cross-functional teams. With a solid foundation in computer science education and hands-on experience, this candidate is a fit for roles requiring deep technical expertise and a commitment to high-quality, efficient software development.

Seasoned full-stack .NET developer with over 11 years' experience specializing in C# and ASP.NET Core application development. Proven track record in building scalable and reliable applications across healthcare, logistics, and financial industries. Expertise in database optimization with MSSQL and implementing RESTful APIs, marked by success in creating responsive web interfaces enhanced with technologies like ReactJS and TypeScript. Holds certifications in ASP.NET Core and Angular app development, as well as SAP Business One. Adept in Agile methodologies and CI/CD practices using Azure DevOps.

Engineer with 6 years of experience specializes in back-end development, architecture, and optimization. Proficient in JavaScript, TypeScript, Python, Node.js, and a suite of modern database technologies. Delivered complex projects, including multi-tenant SaaS platforms and event management systems. Holds a BE in IT with a strong grasp of Agile SDLC and coding best practices. Demonstrated skills in AWS, RESTful APIs, and both SQL and NoSQL databases, with a track record of mentoring teams and driving engineering excellence.

- Senior Software Developer with over 9 years of experience in full-stack development and project management, skilled in Python, C#.NET, JavaScript, and more. - Proven track record in leading teams and delivering 20+ projects in telecom, fintech, and agri-tech sectors. - Expertise in backend architecture, API development, AI integration, and agile methodologies. - Demonstrated success in digital transformations, SDLC management, reducing operational costs, and enhancing system reliability. - Holds a Bachelor's degree in Business IT from the University of Greenwich and advanced computer studies diplomas. - Recognized for mentoring junior developers and achieving a 100% client satisfaction rate on enterprise-level projects.

A proficient web developer with years of practical experience, specializing in creating robust websites using WordPress, Wix, and Shopify. Has a strong foundation in Computer Science with a BS degree from DHA Suffa University. Highly skilled in website design, evidenced by a history of successfully freelancing in the domain. Demonstrates a clear understanding of software development practices and the SDLC. Technically adept in numerous aspects of web development including graphic design and WordPress theme customization, this candidate has a proven track record with companies like Omar Technologies and Dracarys Developers, bringing to the table a blend of technical expertise and pragmatic problem-solving abilities.

Backend Engineer with proven expertise in scalable and secure products using Node.js, Express.js, and MongoDB. Demonstrates technical proficiency in building RESTful APIs, integrating payment services like Paystack, and deploying robust authentication systems. Engages in content creation, sharing backend tutorials while also fostering a community of developers. Holds a bachelor's degree in Environmental Education with further specialization in backend engineering through a diploma. Proven track record in problem-solving and product enhancement within a collaborative team in the travel industry. Key projects include a full-stack Blog Authentication System and a Wallet Transaction System, showcasing proficiency in Node.js, Express, MongoDB, and JWT.

Software engineer with 5 years of experience specializing in full-stack development, adept in both front-end and back-end technologies. Key skills include mastery of React.js, Redux Toolkit, Node.js, Express.js, and familiarity with modern frontend frameworks. Proven track record of driving innovation and handling complex problems, demonstrated by achievements such as the AI-driven navigation bar and data analysis in computational notebooks at BetterBrain. Expert in enhancing user experiences, improving operational efficiency by 30%, and mastering data management solutions. Academic background supported by a Bachelor's degree in Computer Science and continuous professional development through courses. An engineer proficient in SDLC, agile methodologies, and modern development practices, ready to deliver top-tier web applications.

Versatile Junior Developer with expertise in React.js, Core PHP, CodeIgniter, MySQL, and JavaScript, along with a solid foundation in database systems and software engineering from B.Tech in Computer Science. Demonstrated skills in developing dynamic web applications, implementing CRUD operations, and designing secure API integrations. Proven ability to work collaboratively in team environments, paired with a commitment to maintaining high-quality standards in line with CMMi guidelines. Recognized for efficiently handling client requirements, troubleshooting issues, and mentoring junior team members. Portfolio includes building a multilingual import-export platform and a finance tracking app. Holds a Full Stack Developer Certification, showcasing proficiency in modern web technologies.

Expert with Angular, Typescript, Javascript, RxJs, enteprise level applications. Currently learning React and Next.js framework

Expert software engineer with 20+ years of experience specializing in backend and full-stack development. Proficient in an array of languages like PHP, Visual Basic, and JavaScript, with a strong foundation in database architecture across MySQL, PostgreSQL, and SQL Server. Demonstrates a consistent track record of optimizing system performance and scalability, evidenced by a 40% reduction in load times and a successful migration from Delphi to PHP. Holds an engineering degree and numerous technical certifications, underpinning a solid educational foundation in computer science. Recognized for advanced technical skills and delivering high-impact projects such as ScanChex Mobile and comprehensive payroll and administrative systems.

With over half a decade of experience, the engineer stands out as a seasoned React Developer who possesses a deep understanding of front-end technologies including ReactJS, NextJS, JavaScript, and Typescript. An adept professional in employing Rest APIs, Redux, and various CSS frameworks such as Material UI and Tailwind for creating responsive and user-friendly interfaces. The engineer's portfolio includes significant contributions to diverse domains like Social Networking, AgriTech, and IT Services, which showcases versatility and technical acumen. Leveraging a strong background in the entire software development life cycle, the engineer has a proven track record in implementing CI/CD pipelines and maintaining code versions using Git, demonstrating an expertise that optimizes application features and ensures delivery of high-quality software products.

- 8+ years of experience in backend development with a strong focus on Python and distributed systems. - Expertise in Django, FastAPI, and Flask, including experience building and optimizing microservices architectures. - Skilled in designing and maintaining REST APIs and GraphQL services for large-scale telecom, healthcare, and e-commerce platforms. - Deep understanding of PostgreSQL, SQLAlchemy, and MySQL, with experience in database design, optimization, and performance tuning. - Skilled in Docker and Kubernetes for containerization and orchestration, as well as CI/CD pipelines setup using Jenkins. - Experienced in asynchronous programming and real-time systems development. - Strong knowledge of OOP, SOLID, and design patterns, with experience implementing secure and testable backend code. - Worked with AWS (EC2, RDS, S3) and Azure AD B2C for authentication and cloud infrastructure management. - Background in AI integration, data encryption, and authorization systems for enterprise-grade software solutions.

Frontend Developer with over 1 year of self-led learning and 9+ months of hands-on project experience. Expertise in JavaScript, TypeScript, React.js, and Python. Proficient with backend technologies such as Node.js, Express.js, and NestJS, including RESTful APIs and database management using PostgreSQL and Firebase. Demonstrated ability in deploying web applications with tools like Render and CI/CD practices. Strong focus on responsive design, accessibility, and performance optimization, underpinned by knowledge of modern development methodologies and design patterns.

Seasoned Full-stack Developer with a comprehensive understanding of both front-end and back-end technologies, proficient in React, Node.js, and NestJS. Brings over 3 years of commercial experience in creating web applications and automation bots, with a proven track record of optimizing performance and enhancing prompt designs for LLMs resulting in a 30% quality improvement. Demonstrated success in scalable solution development with a focus on efficiency, evident from a 40% MySQL query performance enhancement. Holds solid DevOps fundamentals with hands-on experience in Docker, Git, CI/CD, and a diverse tech stack encompassing Sequelize ORM, Python, and various LLM APIs. Proactive problem-solver and an advocate for clean code practices, geared with a strong education in technology, highlighted by a notable GPA from AEH. Eligible to work in the EU, multilingual with proficiency in English, Polish, Russian, and Belarusian, and with a future plan to potentially shift base to Düsseldorf in 2026.