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I am a Senior Full Stack & AI Engineer with 10+ years of experience delivering scalable SaaS platforms, data-intensive systems, and AI-powered products across finance, government, and enterprise environments. I specialize in React, Node.js, TypeScript/JavaScript, C#/.NET, Go, PostgreSQL, and cloud-native architectures including LLM/RAG, microservices, workflow orchestration, and observability. I’m known for boosting performance, reliability, and security, driving platform standardization (IDP) and mentoring teams to ship faster with higher quality. I’ve delivered production AI and React + Node.js features adopted by thousands of internal users, led IDP initiatives, reduced manual ops through automation and AI-guidance, and implemented robust monitoring, testing, and secure guardrails for safe AI usage.…I am a Senior Full Stack & AI Engineer with 10+ years of experience delivering scalable SaaS platforms, data-intensive systems, and AI-powered products across finance, government, and enterprise environments. I specialize in React, Node.js, TypeScript/JavaScript, C#/.NET, Go, PostgreSQL, and cloud-native architectures including LLM/RAG, microservices, workflow orchestration, and observability. I’m known for boosting performance, reliability, and security, driving platform standardization (IDP) and mentoring teams to ship faster with higher quality. I’ve delivered production AI and React + Node.js features adopted by thousands of internal users, led IDP initiatives, reduced manual ops through automation and AI-guidance, and implemented robust monitoring, testing, and secure guardrails for safe AI usage.

Kamil Toporek

Full Stack Developer, AI Developer, AI Engineer, +5

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I am a Senior Full Stack & AI Engineer with 10+ years of experience delivering scalable SaaS platforms, data-intensive systems, and AI-powered products across finance, government, and enterprise environments. I specialize in React, Node.js, TypeScript/JavaScript, C#/.NET, Go, PostgreSQL, and cloud-native architectures including LLM/RAG, microservices, workflow orchestration, and observability. I’m known for boosting performance, reliability, and security, driving platform standardization (IDP) and mentoring teams to ship faster with higher quality. I’ve delivered production AI and React + Node.js features adopted by thousands of internal users, led IDP initiatives, reduced manual ops through automation and AI-guidance, and implemented robust monitoring, testing, and secure guardrails for safe AI usage.…I am a Senior Full Stack & AI Engineer with 10+ years of experience delivering scalable SaaS platforms, data-intensive systems, and AI-powered products across finance, government, and enterprise environments. I specialize in React, Node.js, TypeScript/JavaScript, C#/.NET, Go, PostgreSQL, and cloud-native architectures including LLM/RAG, microservices, workflow orchestration, and observability. I’m known for boosting performance, reliability, and security, driving platform standardization (IDP) and mentoring teams to ship faster with higher quality. I’ve delivered production AI and React + Node.js features adopted by thousands of internal users, led IDP initiatives, reduced manual ops through automation and AI-guidance, and implemented robust monitoring, testing, and secure guardrails for safe AI usage.

Available to hire

I am a Senior Full Stack & AI Engineer with 10+ years of experience delivering scalable SaaS platforms, data-intensive systems, and AI-powered products across finance, government, and enterprise environments. I specialize in React, Node.js, TypeScript/JavaScript, C#/.NET, Go, PostgreSQL, and cloud-native architectures including LLM/RAG, microservices, workflow orchestration, and observability.

I’m known for boosting performance, reliability, and security, driving platform standardization (IDP) and mentoring teams to ship faster with higher quality. I’ve delivered production AI and React + Node.js features adopted by thousands of internal users, led IDP initiatives, reduced manual ops through automation and AI-guidance, and implemented robust monitoring, testing, and secure guardrails for safe AI usage.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Senior Software Engineer & AI Developer at Concentrix

October 1, 2023 - November 13, 2025

Designed and delivered React + Node.js AI-assisted workflows reducing manual effort in support and operations by 30–40%. Implemented RAG pipelines and semantic search APIs consumed by React UIs and Node.js backends. Built and optimized Node.js, Go, and .NET REST/GraphQL services on GKE, following clean architecture, observability, and security best practices. Integrated LLM-based assistants with role-based access and audit trails. Improved API performance and reliability via async I/O, caching, circuit breakers, and structured logging. Set up end-to-end CI/CD pipelines for React frontends and Node.js services with automated tests and quality gates. Collaborated with product, security, and SRE teams to design safe AI usage patterns including guardrails, redaction, and controlled prompts. Mentored engineers on modern React architecture, Node.js best practices, and scalable API design.

Full Stack Engineer at Synox

September 1, 2023 - September 1, 2023

Built and scaled election platforms using React, Node.js, .NET Core, Django REST, and PostgreSQL, ensuring reliability during large election cycles. Implemented real-time React dashboards (WebSockets, streaming APIs) backed by Node.js / Go services for live election monitoring and alerts. Integrated AI-based anomaly detection into backend services, exposing insights through React admin interfaces. Designed reusable React UI components with audit logs and traceable AI/system decisions. Developed an Android event tracking SDK integrated with Node.js / Django APIs for accurate analytics. Introduced structured testing (Jest, Cypress, pytest) and CI pipelines, improving stability and release confidence. Ensured security, compliance, and data protection standards across the platform.

Full Stack Developer at Look4IT

March 1, 2020 - March 1, 2020

Developed secure React + .NET Core web applications for banking and financial clients with strong authentication and authorization. Built and maintained Node.js and .NET REST APIs for payments, lending, and customer portals aligned with performance and security requirements. Integrated ML scoring services (risk, churn, recommendation) into core workflows via Node.js / .NET with robust fallback logic and monitoring. Participated in migrating legacy applications into containerized Microservices on cloud infrastructure. Collaborated in Agile teams, contributing to architecture, code reviews, documentation, and production support. Ensured security, compliance, and data protection standards.

Junior Software Engineer at Kenja K.K.

January 1, 2018 - January 1, 2018

Built high-volume Node.js / TypeScript event ingestion services and APIs processing millions of events per day. Designed Kafka-based pipelines powering personalization, analytics, and customer journey tracking features. Implemented APIs for segmentation, cohorts, and event queries with efficient data access patterns. Optimized critical queries, indexes, and caching to keep response times low under high traffic. Worked closely with product teams to turn tracking requirements into reliable backend capabilities and clear documentation.