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Senior Full Stack Engineer with 5+ years building production SaaS applications using React, Next.js, TypeScript, and Node.js (NestJS/Express). Experienced across full-stack development: REST/WebSocket APIs, real-time systems, message queues, secure auth/authorization, scalable UI systems, and data-driven workflows. Previously led and delivered architecture and end-to-end features across multiple SaaS products including credit services emulation platforms, marketing/bot management systems, automated resume builder tools, and medical 3D learning platforms, working with MongoDB/PostgreSQL, RBAC, WebSockets/SSE, and RabbitMQ-driven event architectures.…Senior Full Stack Engineer with 5+ years building production SaaS applications using React, Next.js, TypeScript, and Node.js (NestJS/Express). Experienced across full-stack development: REST/WebSocket APIs, real-time systems, message queues, secure auth/authorization, scalable UI systems, and data-driven workflows. Previously led and delivered architecture and end-to-end features across multiple SaaS products including credit services emulation platforms, marketing/bot management systems, automated resume builder tools, and medical 3D learning platforms, working with MongoDB/PostgreSQL, RBAC, WebSockets/SSE, and RabbitMQ-driven event architectures.

Aliaksei Tserakhau

Full Stack Developer, Front-End Developer, Web Developer

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Senior Full Stack Engineer with 5+ years building production SaaS applications using React, Next.js, TypeScript, and Node.js (NestJS/Express). Experienced across full-stack development: REST/WebSocket APIs, real-time systems, message queues, secure auth/authorization, scalable UI systems, and data-driven workflows. Previously led and delivered architecture and end-to-end features across multiple SaaS products including credit services emulation platforms, marketing/bot management systems, automated resume builder tools, and medical 3D learning platforms, working with MongoDB/PostgreSQL, RBAC, WebSockets/SSE, and RabbitMQ-driven event architectures.…Senior Full Stack Engineer with 5+ years building production SaaS applications using React, Next.js, TypeScript, and Node.js (NestJS/Express). Experienced across full-stack development: REST/WebSocket APIs, real-time systems, message queues, secure auth/authorization, scalable UI systems, and data-driven workflows. Previously led and delivered architecture and end-to-end features across multiple SaaS products including credit services emulation platforms, marketing/bot management systems, automated resume builder tools, and medical 3D learning platforms, working with MongoDB/PostgreSQL, RBAC, WebSockets/SSE, and RabbitMQ-driven event architectures.

Available to hire

Senior Full Stack Engineer with 5+ years building production SaaS applications using React, Next.js, TypeScript, and Node.js (NestJS/Express). Experienced across full-stack development: REST/WebSocket APIs, real-time systems, message queues, secure auth/authorization, scalable UI systems, and data-driven workflows.

Previously led and delivered architecture and end-to-end features across multiple SaaS products including credit services emulation platforms, marketing/bot management systems, automated resume builder tools, and medical 3D learning platforms, working with MongoDB/PostgreSQL, RBAC, WebSockets/SSE, and RabbitMQ-driven event architectures.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Intermediate

Russian

Fluent

Work Experience

Senior Full Stack Engineer

November 1, 2024 - Present

Led development of full-stack SaaS products using React (feature-sliced design), Next.js, TypeScript, and Node.js back ends (NestJS/Express). Designed and implemented REST and WebSocket APIs, plus real-time UI synchronization. Built secure auth flows using RBAC and protected API routes. Implemented event-driven workflows with RabbitMQ, including asynchronous processing and cross-system communication. Modeled hierarchical configuration engines and audit-sensitive operations. Integrated hierarchical data searches using dual IDs (external provider IDs and MongoDB objectId) for debugging and traceability. Optimized data-heavy interfaces via caching strategies and efficient data fetching. Delivered modular architectures including feature-sliced design and server/client boundaries, with secure middleware and routing.

Front-End / Full Stack Engineer

January 1, 2021 - October 31, 2024

Delivered UI architecture and product features across multiple domains, including medical 3D learning and workspace management platforms. Developed complex form/workflow features using React Hook Form + Zod and ensured schema-compatible backend validation. Migrated legacy state management across 20+ modules to Redux Toolkit and RTK Query with normalized caching. Implemented dynamic data visualization modules (e.g., ApexCharts) for complex clinical datasets. Optimized React performance using Webpack configurations, lazy loading, and tree-shaking. Improved international deployments with i18n (Next.js). Built component libraries using Storybook, created interactive floor-plan visualizations with real-time booking status updates, and improved CI/CD pipelines via Webpack/Vite optimization and dependency caching.

Senior Full Stack Engineer

January 1, 2021 - October 31, 2024

Built administrative and platform features for remote credit services emulator and marketing/bot management systems. Delivered Next.js applications with SSO (SSR/SSG) and integrated backend APIs. Implemented backend services for campaign/order/subscription logic and payment/transactional workflows. Designed PostgreSQL relational models for campaign management, orders, and billing. Implemented asynchronous workflows using RabbitMQ for automation and integration pipelines. Architected secure server/client boundaries with middleware-based RBAC and secure route handling. Integrated Auth.js (NextAuth v5) with OAuth/credential providers and built multi-step workflows with shared validation logic across UI and backend. Developed scalable APIs with pagination, filtering, and sorting for large datasets. Integrated third-party services via REST APIs with robust error handling and retry strategies.