Hire Vetted Web Application Engineers at Upstaff - Page 2

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.

• Engineer with 5+ years of experience specializing in JavaScript (Node.js, React.js) and TypeScript, delivering scalable backend services and responsive frontend applications.
• Proficient in modern frameworks and tools including Nest.js, Express, Next.js, GraphQL, Docker, AWS (Lambda, Step Functions, SQS), and CI/CD pipelines.
• Strong expertise in database management with PostgreSQL, MongoDB, DynamoDB, and Redis, implementing event-driven architectures and microservices.
• Demonstrated ability to optimize performance, enhance security (AWS Secrets Manager), and integrate complex third-party APIs across diverse domains such as sports streaming, finance, task management, and fitness platforms.
• Advanced academic background in Software Engineering and Cybersecurity, with ongoing PhD studies, underpinning a solid foundation in software development lifecycle, best practices, and engineering principles.

• 9+ years of experience in full-stack roles with JS and TypeScript (Node.js, NestJS, React, React Native).
• Israeli fintech, telecom, and gambling solutions, including high-performance systems handling 10,000+ daily transactions, integrating multiple payment providers, including banking APIs and cryptocurrency.
• Holds a Bachelor’s degree in Theoretical and Nuclear Physics, combining analytical rigor with advanced skills in AWS, Docker, GraphQL, SQL/NoSQL databases, and UI frameworks like Ant Design and MUI.
• Background in software engineering principles, OOP & functional programming, and modern SDLC practices, including Agile, CI/CD, and test automation with Cypress and Jest.

Backend Engineer, 8+ years of hands-on experience architecting production-grade Python systems — primarily with FastAPI, microservices, and cloud-native infrastructure. Specializes in building reliable APIs (REST + GraphQL via AWS AppSync), high-performance data layers, real-time features (WebSocket), and secure, observable platforms that power AI-driven SaaS, FinTech/loan management, personalized education, and meditation applications.

• Robust, versioned APIs with pagination, filtering, bulk operations, and real-time capabilities for enterprise standards.
• Security models using JWT, OAuth2, Cognito/Firebase Auth, and OWASP plus secrets management in AWS.
• PostgreSQL/SQLAlchemy setups with strict validation, indexing, query tuning, migrations (Alembic), and entity versioning (Continuum).
• Integrations & background jobs (Celery/AWS Lambda), idempotent processing, retries, and Stripe/Telegram/webhook handling.
• End-to-end CI/CD with GitHub Actions, Docker, Kubernetes, ECS, ArgoCD for zero-downtime rollouts and automated testing.
• Full observability stacks (Prometheus + Grafana, CloudWatch) with alerts, dashboards, and runbooks for proactive monitoring.
• Comprehensive operational documentation, team training, and code reviews as a Team Lead managing up to 8 engineers.

Optimized high-load endpoints, reduced latency through caching/profiling, enforced business rules at the DB level, and led refactorings and migrations. Passionate about clean architecture, maintainability, and turning complex business needs into elegant, scalable solutions.

• Full-stack engineer with 6+ years of expertise in TypeScript, React, React Native, Node.js, and .NET Core, delivering scalable B2B and healthcare applications with 40% latency reduction through query optimization.
• Proficient in integrating analytics SDKs (Mixpanel, Firebase, AdMob) and implementing secure JWT authentication and role-based access control in cross-platform mobile apps.
• Experienced in CI/CD pipelines using GitLab CI/CD, automated testing (Jest, Cypress), and cloud deployments on AWS and Docker, enabling rapid iterative releases and A/B testing.
• Strong background in SQL databases (PostgreSQL, MySQL, SQL Server) with advanced query optimization for analytics-driven growth metrics.
• Holds an MSc in Computer Science and IT, skilled in modular architecture, feature flags, and AI-augmented development to accelerate coding and improve UX flows.

• Full-stack JavaScript developer with 3+ years of experience specializing in Angular (v2+), NestJS, and TypeScript for scalable, high-performance web applications.
• Proficient in integrating REST and GraphQL APIs, implementing OAuth, SMS OTP, and magic link authentication workflows using Supabase and JWT.
• Skilled in advanced state management with NgRx, reactive forms with RxJS, and custom UI development using Angular Material, PrimeNG, Taiga UI, and Tailwind CSS.
• Experienced in low-code platforms (Appian), CI/CD pipelines, automated testing, and performance optimization leveraging Google Lighthouse and Core Web Vitals.
• Strong background in data normalization, modular architecture, microservices, and secure coding practices including RBAC, bcrypt encryption, and audit trails.

• Full Stack Engineer with 6+ years of experience architecting scalable web applications and microservices using Node.js (Express) and Laravel, delivering production-grade solutions for UK startups.
• Expertise in AI-powered automation workflows (n8n, LLM APIs, MCP) and event-driven backends, achieving 50% reduction in document processing time and enhanced cross-team visibility.
• Proficient in Python scripting for automation, and skilled in databases including MySQL, PostgreSQL, MongoDB, and Neo4j, with hands-on AWS and Docker deployment experience.
• Strong advocate of TDD, Clean Architecture, OOP design patterns, and modular monoliths, improving code reliability by 60% and system maintainability.
• Holds a Master’s degree in Software Engineering and fluent in Arabic, French, and English, with proven leadership in remote, distributed agile teams.

• Experienced software engineer with over 20 years in full-stack development, specializing in JavaScript, TypeScript, NodeJS, Python, and modern frameworks like ReactJS, NextJS, and NestJS.
• Proficient in AI/GenAI technologies including LangChain, LangGraph, and prompt tuning, with hands-on experience building AI-powered sales enablement and analytics platforms on AWS and Serverless architectures.
• Strong background in cloud platforms (AWS, GCP), containerization (Docker), and infrastructure as code (Terraform), delivering scalable e-commerce and ad-tech solutions.
• Skilled in database technologies such as MongoDB, PostgreSQL, Redis, and API design using REST and GraphQL, with expertise in microservices and composable app architectures.
• Holds a Master of Computer Applications degree, PMP and ITIL certifications, with proven leadership in project and operations management across multiple domains including e-commerce, analytics, and digital marketing.

I am a Senior Full Stack Developer with over 10 years of extensive and deep experience  designing, developing, and deploying high-performance web applications and enterprise-level platforms. My expertise spans the entire technology stack, allowing me to deliver robust, scalable, and maintainable solutions from concept to production.

• Full-Stack Engineer with 10 years of experience building and scaling web and SaaS products across fintech, edtech, martech, crypto, energy, and AI-driven domains.
• Skilled in JavaScript, TypeScript, and Python, with hands-on experience in frontend development using React, Next.js, and Vue.js, and backend development with Node.js, NestJS, Express, and Python-based frameworks.
• Designed and implemented system architectures for complex platforms, including distributed systems, microservices, real-time applications, and API-driven products with PostgreSQL, MongoDB, Redis, ClickHouse, and Elasticsearch.
• Led full-cycle development of high-load platforms such as crypto trading systems, communication automation tools, educational video platforms, and SaaS products, from requirements and architecture to production launch and scaling.
• Integrated AI and machine learning components into production systems using OpenAI APIs, LangChain, FAISS, PyTorch, and other AI tooling for personalization, automation, and content generation.
• Built and maintained infrastructure using Docker, Kubernetes, Terraform, and CI/CD pipelines, working extensively with AWS and Google Cloud environments.
• Experienced in technical leadership, including frontend architecture ownership, mentoring engineers, hiring, and organizing engineering teams across multiple projects.

I am a senior software architect and blockchain automation engineer , with over 20 years of professional development experience and 4+ years dedicated to crypto, trading bots, WebSocket systems, and SaaS automation platforms.

My career spans enterprise systems, mobile applications, cloud analytics, authentication infrastructure, and large-scale data platforms — evolving into high-performance blockchain automation and bot engineering across Solana and Ethereum ecosystems.

I specialize in building:

• Real-time token tracking systems
• Telegram trading bots
• Solana Token Bundling, Deployment and tracking platforms,
• Rug detection & dev-sell intelligence
• MongoDB-driven analytics platforms
• Event-driven SaaS backends

All systems are designed for 24/7 uptime, restart persistence, and real trader usage — not prototypes.

Core Expertise

Blockchain & Crypto

• Solana Web3.js
• Ethereum (EVM)
• Pump.fun SDK
• Token metadata indexing
• Market cap & liquidity tracking
• Dev-sell detection
• Rugpull analysis
• ATH / ROI analytics
• Wallet behavior monitoring

Bot & Automation Systems

• Trading bots
• Token sniper trackers
• Telegram bots
• Volume simulation bots
• Alert engines
• Subscription lifecycle managers

Real-time ranking systems

• 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.