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I am a Senior AI / GenAI Full-Stack Engineer based in Zielona Góra, Poland, with 10+ years building production-grade backend, full-stack, and GenAI systems in fintech and healthtech. I design secure, compliant LLM platforms with RAG pipelines, fine-tuning (LoRA/PEFT), multi-agent orchestration, and observability across cloud environments (AWS, Azure, GCP). I thrive in regulated settings (GDPR, SOC 2, PCI-DSS, KYC/AML) and focus on delivering measurable business impact. Recently, I led the development of a core agentic GenAI platform for AML/KYC investigations, automating 85–95% of routine alerts and cutting analyst review time by 70–80%. I optimized model fine-tuning and deployment costs with vLLM, built robust RBAC and encryption into backend services, and delivered real-time AI decision dashboards for compliance teams to audit and supervise thousands of daily actions with full transparency.…I am a Senior AI / GenAI Full-Stack Engineer based in Zielona Góra, Poland, with 10+ years building production-grade backend, full-stack, and GenAI systems in fintech and healthtech. I design secure, compliant LLM platforms with RAG pipelines, fine-tuning (LoRA/PEFT), multi-agent orchestration, and observability across cloud environments (AWS, Azure, GCP). I thrive in regulated settings (GDPR, SOC 2, PCI-DSS, KYC/AML) and focus on delivering measurable business impact. Recently, I led the development of a core agentic GenAI platform for AML/KYC investigations, automating 85–95% of routine alerts and cutting analyst review time by 70–80%. I optimized model fine-tuning and deployment costs with vLLM, built robust RBAC and encryption into backend services, and delivered real-time AI decision dashboards for compliance teams to audit and supervise thousands of daily actions with full transparency.

Mariusz Chwiedzewicz

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

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I am a Senior AI / GenAI Full-Stack Engineer based in Zielona Góra, Poland, with 10+ years building production-grade backend, full-stack, and GenAI systems in fintech and healthtech. I design secure, compliant LLM platforms with RAG pipelines, fine-tuning (LoRA/PEFT), multi-agent orchestration, and observability across cloud environments (AWS, Azure, GCP). I thrive in regulated settings (GDPR, SOC 2, PCI-DSS, KYC/AML) and focus on delivering measurable business impact. Recently, I led the development of a core agentic GenAI platform for AML/KYC investigations, automating 85–95% of routine alerts and cutting analyst review time by 70–80%. I optimized model fine-tuning and deployment costs with vLLM, built robust RBAC and encryption into backend services, and delivered real-time AI decision dashboards for compliance teams to audit and supervise thousands of daily actions with full transparency.…I am a Senior AI / GenAI Full-Stack Engineer based in Zielona Góra, Poland, with 10+ years building production-grade backend, full-stack, and GenAI systems in fintech and healthtech. I design secure, compliant LLM platforms with RAG pipelines, fine-tuning (LoRA/PEFT), multi-agent orchestration, and observability across cloud environments (AWS, Azure, GCP). I thrive in regulated settings (GDPR, SOC 2, PCI-DSS, KYC/AML) and focus on delivering measurable business impact. Recently, I led the development of a core agentic GenAI platform for AML/KYC investigations, automating 85–95% of routine alerts and cutting analyst review time by 70–80%. I optimized model fine-tuning and deployment costs with vLLM, built robust RBAC and encryption into backend services, and delivered real-time AI decision dashboards for compliance teams to audit and supervise thousands of daily actions with full transparency.

Available to hire

I am a Senior AI / GenAI Full-Stack Engineer based in Zielona Góra, Poland, with 10+ years building production-grade backend, full-stack, and GenAI systems in fintech and healthtech. I design secure, compliant LLM platforms with RAG pipelines, fine-tuning (LoRA/PEFT), multi-agent orchestration, and observability across cloud environments (AWS, Azure, GCP). I thrive in regulated settings (GDPR, SOC 2, PCI-DSS, KYC/AML) and focus on delivering measurable business impact.

Recently, I led the development of a core agentic GenAI platform for AML/KYC investigations, automating 85–95% of routine alerts and cutting analyst review time by 70–80%. I optimized model fine-tuning and deployment costs with vLLM, built robust RBAC and encryption into backend services, and delivered real-time AI decision dashboards for compliance teams to audit and supervise thousands of daily actions with full transparency.

Skills

Experience Level

Expert

Expert

Expert

Expert

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Expert

Expert

Expert

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Expert

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Expert

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Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Polish

Fluent

Work Experience

Senior AI / GenAI Full-Stack Engineer at Greenlite

October 1, 2023 - November 1, 2025

Led development of the core agentic multi-agent GenAI platform using LangChain/LangGraph, Pinecone, and OpenAI / Azure OpenAI, enabling automated end-to-end investigations for AML alerts and KYC reviews at regulated banks and fintech clients. Architected sophisticated RAG pipelines with advanced context engineering over diverse structured/unstructured data sources, automating 85–95% of routine/low-risk compliance alerts and cutting analyst review time by 70–80% across production deployments. Spearheaded domain-specific fine-tuning of Llama/Mistral models via LoRA/PEFT; productionized inference with vLLM on Kubernetes, reducing API/inference costs by ~45% and maintaining low-latency inference under high daily alert volumes. Authored robust FastAPI/Node.js backend services with granular RBAC, end-to-end encryption, and full audit trails achieving SOC 2 Type II certification with embedded AI safety & explainability. Built React/Next.js dashboards for real-time AI decision monitoring,

Software Engineer / AI Specialist at Vinehealth

June 1, 2019 - September 1, 2023

Engineered AI-powered health platforms using FastAPI and cloud services, enabling natural language queries over patient/operational data for hundreds of clinicians. Implemented RAG systems and prompt-engineered workflows, boosting query accuracy by ~55% and reducing staff research time by half. Integrated LangFuse observability, detecting model drift early and preventing 90%+ of potential production failures in clinician tools. Crafted GDPR-compliant backend services in Java/Kotlin (Spring Boot) and C#/.NET for secure integrations and data processing. Collaborated on React dashboards for care coordination and reporting, rolled out across multiple clinical teams and handling 10x workload growth. Automated Kubernetes infrastructure, eliminating downtime spikes during 10x system scale-up.

Full-Stack Developer at Banqware

February 1, 2017 - May 1, 2019

Led cross-functional collaboration with product and operations teams to launch features and admin tools, directly supporting company-wide adoption and revenue growth. Pioneered Node.js/React fintech platform for gig economy payroll and compliance, scaling to process tens of thousands of contractor transactions monthly with zero downtime during peak periods. Integrated secure payment and KYC verification flows using Stripe/Plaid, achieving 100% PCI-DSS compliance and enabling seamless onboarding for high-volume clients. Developed idempotent APIs and background processing in Java/Spring Boot and .NET, slashing reconciliation errors by ~70% and accelerating transaction speeds by 50%.

Web Developer at Nestmedic S.A.

October 1, 2015 - January 1, 2017

Spearheaded development and maintenance of GDPR-compliant web applications for healthcare clients, supporting secure access to sensitive patient data across environments and user roles using PHP (MVC), JavaScript, HTML/CSS, and MySQL/PostgreSQL. Directed legacy system migrations to AWS, actively supporting service re-hosting, environment configuration, and deployment validation with EC2, RDS, S3, and basic IAM, improving availability from ~95% to 99.9%. Designed responsive frontend and backend features, implementing basic encryption, authentication, and role-based access control. Established early cloud deployment practices, security configuration, and compliance documentation.