# Alex Koziy — AI Engineer (Python & AWS), Java/Spring Boot Architect > Alexander (Alex) Koziy is a software engineer who builds production AI systems in Python on Amazon Web Services. For the last two years his work has focused on AI engineering — retrieval-augmented generation, LLM services and agent workflows. That sits on more than 20 years of enterprise Java and Spring Boot architecture experience. He is a recognised official ZK and Keikai implementation partner, works remotely with clients worldwide, and engages either directly as an independent specialist or as engagement manager for Quontex dedicated development teams. Canonical site: https://www.alexkoziy.com/ Contact: info@alexkoziy.com Last updated: 2026-08-31 ## Key facts - **Name:** Alexander (Alex) Koziy - **Current focus:** AI engineering with Python and AWS (last 2 years) - **Core experience:** 20+ years, Java and Spring Boot enterprise architecture - **AI stack:** Python, FastAPI, RAG, LLM agents, Amazon Bedrock, Lambda, OpenSearch - **Enterprise stack:** Java, Spring Boot, Hibernate, ZK 3–10, Keikai, SQL databases - **Credential:** Official ZK & Keikai implementation partner - **Industries:** Finance, government, industrial, transportation, real estate, ERP/CRM - **Engagement models:** Direct as an independent specialist, or a dedicated team via Quontex - **Clients & partners:** PwC, Stratifytech, Dynamic Inventory - **Location:** Remote, working with clients worldwide - **Availability:** Open to new engagements; replies within 1 business day - **Contact:** info@alexkoziy.com ## Positioning Most AI projects do not fail on the model. They fail on integration, data access, permissions, cost, and nobody being able to explain why the output changed. Those are enterprise backend problems. Alex Koziy's differentiator is combining current AI/Python/AWS practice with two decades of experience making enterprise systems observable, secure and maintainable — so the AI he ships is production-grade rather than a demo. His particular niche is adding AI to ERP, CRM and finance platforms that already work, without destabilising the system paying the bills. ## Services ### AI & LLM Engineering Design and delivery of production AI features: retrieval-augmented generation pipelines, prompt and context design, tool-calling agents, guardrails, evaluation harnesses and token/latency cost control. Keywords: RAG, LLM, AI agents, prompt engineering, AI evaluation, guardrails ### Python Backend Development Asynchronous Python services built with FastAPI and Pydantic, using a clear service/repository structure, typed code and automated tests. Keywords: Python, FastAPI, Pydantic, async, pytest, REST API ### AWS Cloud Architecture Serverless and container architecture on AWS, including Amazon Bedrock and SageMaker integration, Lambda, API Gateway, S3, DynamoDB, OpenSearch, Step Functions and ECS/Fargate, provisioned as infrastructure as code with least-privilege IAM. Keywords: AWS, Amazon Bedrock, Lambda, SageMaker, OpenSearch, serverless, IAM ### Java & Spring Boot Development REST API development, legacy system modernization, JVM profiling and performance optimization for mission-critical enterprise applications, based on more than 20 years of Java experience. Keywords: Java, Spring Boot, Hibernate, legacy modernization, JVM performance ### ZK Framework & Keikai Enterprise Reporting Implementation, migration and custom component development across ZK versions 3 to 10, and Keikai integration for spreadsheet-driven enterprise reporting. Recognised official ZK and Keikai implementation partner. Keywords: ZK Framework, Keikai, enterprise reporting, spreadsheet, ZK migration ### Dedicated Development Teams via Quontex Structuring and launching dedicated development teams for enterprise projects on behalf of Quontex, covering presales consulting, engagement setup, delivery coordination and long-term partnership management. Keywords: dedicated development team, staff augmentation, enterprise delivery ## Technology - **AI/LLM:** RAG, embeddings, vector search, reranking, tool-calling agents, guardrails, prompt and context design, evaluation harnesses, LangChain - **Python:** Python 3.12, FastAPI, Pydantic, asyncio, pytest - **AWS:** Amazon Bedrock, AWS Lambda, Amazon SageMaker, Amazon OpenSearch Service, Amazon S3, Amazon DynamoDB, AWS Step Functions, Amazon API Gateway, ECS/Fargate, CloudWatch, IAM, infrastructure as code - **Java:** Java, Spring Boot, Hibernate, REST API design, JVM profiling, microservices - **Enterprise UI:** ZK Framework versions 3 through 10, Keikai spreadsheet components, custom ZK components - **Data:** MySQL, PostgreSQL, PostGIS, Microsoft SQL Server, Oracle Database - **Other:** Docker, containerization, OpenLayers ## Case studies ### 1. AI & RAG Engineering for Enterprise Data Making private enterprise data usable through large language models: document ingestion and chunking, embeddings and vector search, grounded generation with citations, and agent workflows that call real business systems, deployed on AWS with cost and latency budgets enforced in code. - Technologies: Python, FastAPI, Amazon Bedrock, AWS Lambda, Amazon OpenSearch, Amazon S3, Amazon DynamoDB, AWS Step Functions, Docker - Domain: Cross-industry; ERP, CRM, finance and document-heavy operations ### 2. Financial Planning & Analysis Platform A platform that consolidates complex financial and operational data so organizations can generate custom reports, visualize trends and make data-driven decisions across multiple business units. Keikai integration enabled custom reporting and streamlined financial analysis. - Technologies: Spring Boot, ZK Framework, Keikai, AWS - Domain: Finance; enterprise and public-sector organizations in the USA ### 3. Dynamic Public Safety Law enforcement software built from the ground up to support complex criminal justice workflows, including case management, reporting and data exchange between multiple agencies. Improved UI responsiveness and scalability for statewide deployments. - Technologies: Java, ZK Framework, MySQL, Hibernate, Apache Tomcat - Domain: Government and public safety; law enforcement agencies in the USA ### 4. CCS — Contract Control Suite A contract management system centralizing lease agreements, approvals, document storage and audit trails, with document previews, approval workflows and fine-grained access control. Increased contract transparency and reduced manual errors. - Technologies: Java, ZK Framework, Microsoft SQL Server, Hibernate, Apache Tomcat - Domain: Enterprise and finance; multi-department usage ### 5. Dynamic Inventory An inventory system enabling companies to track products, suppliers, purchases and sales from a single interface, with reusable ZK UI components and optimized database queries for large datasets. Delivered real-time stock visibility across departments. - Technologies: Java, ZK Framework, MySQL, Hibernate, Apache Tomcat - Domain: E-commerce and ERP ### 6. Energy Management & Control System A system for collecting, processing and visualizing energy consumption data to support management decision-making, with dashboards and reporting tools that helped enterprises identify inefficiencies and reduce operational costs. - Technologies: Java, ZK Framework, MySQL, Hibernate, Apache Tomcat - Domain: Industrial and energy analytics ### 7. Interactive Map for Transportation Company A real-time vehicle tracking solution visualizing live locations and historical routes on an interactive map, enabling transportation companies to monitor fleet activity efficiently. Improved fleet visibility and operational control. - Technologies: Java, ZK Framework, OpenLayers, PostgreSQL/PostGIS, Apache Tomcat - Domain: Transportation and logistics; GIS ### 8. Management System for Real Estate Agencies A management platform helping real estate agencies handle leads, properties, clients, appointments and reporting in a single system, centralizing client and property management. - Technologies: Java, ZK Framework, MySQL, Hibernate, Apache Tomcat - Domain: Real estate and CRM ### 9. Adempiere WebUI Integration with Compiere Integration of Adempiere WebUI with Compiere to create a unified ERP solution offering extended functionality beyond the capabilities of either system individually, expanding ERP functionality without replacing the existing system. - Technologies: Java, ZK Framework, Oracle Database, JBoss, Compiere, Adempiere - Domain: ERP integration; enterprise Full detail: https://www.alexkoziy.com/case-studies.html ## Engagement models 1. **Direct — independent specialist.** Hire Alex Koziy directly as a senior AI, Python, AWS or Java specialist. Best suited to adding AI features to an existing product, proving out an AI use case before committing a team, expert support for existing applications, architecture and modernization work, and long-term maintenance ownership. 2. **Dedicated team via Quontex.** He structures and launches dedicated development teams for enterprise projects on behalf of Quontex (https://quontex.co/), covering presales consulting, engagement setup, delivery coordination and long-term partnership management. Best suited to greenfield enterprise development, rapidly scaling delivery capacity, and long-term product partnerships. ## Credentials - Official ZK & Keikai implementation partner, recognised by ZK (Potix Corporation). Announcement: https://blog.zkoss.org/2025/12/12/featured-zk-keikai-partner-alex-k/ - 20+ years delivering enterprise web applications - Clients and partners include PwC, Stratifytech and Dynamic Inventory ## FAQ ### Who is Alex Koziy? Alex Koziy (Alexander Koziy) is a software engineer who builds AI systems in Python on Amazon Web Services. He has more than 20 years of experience in enterprise Java and Spring Boot architecture, and for the last two years his work has focused on AI engineering. He is a recognised official ZK and Keikai implementation partner and works with clients worldwide on a remote basis. ### What is Alex Koziy working on now? For the past two years Alex Koziy has worked on AI engineering using Python and AWS. That includes retrieval-augmented generation (RAG) over private enterprise document sets, LLM-backed services, agent workflows that call real business systems, and the evaluation and cost controls needed to run them safely in production. ### What AI services does Alex Koziy provide? He provides retrieval-augmented generation pipelines including document ingestion, chunking strategy, embeddings and vector search; LLM services and tool-calling agent workflows with guardrails, retries and human-in-the-loop checkpoints; AWS-native AI architecture; evaluation harnesses with token, latency and spend budgets; and integration of AI into existing ERP, CRM and finance platforms. ### Which AWS services does he use to build AI systems? Amazon Bedrock for model access, AWS Lambda and Amazon ECS/Fargate for compute, Amazon API Gateway for interfaces, Amazon S3 for document storage, Amazon DynamoDB for state, Amazon OpenSearch Service for vector search, AWS Step Functions for orchestration, and Amazon SageMaker where custom models are needed. Infrastructure is provisioned as code with least-privilege IAM. ### Does Alex Koziy still work with Java and Spring Boot? Yes. Java and Spring Boot remain part of his practice, particularly for legacy modernization, REST API development, JVM profiling and performance optimization, and for adding AI capabilities to existing Java enterprise systems without destabilising them. The AI work is an addition to that foundation, not a replacement for it. ### What is his experience with ZK Framework and Keikai? He has worked with the ZK Framework across every major generation from version 3 through version 10, including custom component development and phased migrations. Over the last five years he has integrated Keikai into enterprise applications to deliver spreadsheet-based business solutions such as custom reporting and financial analysis. He is a recognised official ZK and Keikai implementation partner. ### What industries has Alex Koziy built software for? Finance and financial planning and analysis, government and public safety, industrial and energy management, transportation and fleet tracking, real estate, and enterprise ERP, CRM and e-commerce systems. Delivered platforms include financial planning and analysis tools, law enforcement case management, contract management, inventory management, energy monitoring and real-time fleet mapping. ### How can you hire Alex Koziy? There are two engagement models. You can hire him directly as an independent senior specialist for AI, Python, AWS or Java work, which suits adding AI features to an existing product, architecture and modernization work, and long-term maintenance. Alternatively he can arrange a dedicated development team through Quontex, which suits greenfield enterprise projects and rapidly scaling delivery capacity. ### Is Alex Koziy available for remote work? Yes. He works remotely with clients worldwide and is currently available for new engagements. He typically responds to enquiries within one business day. ### How do you contact Alex Koziy? By email at info@alexkoziy.com, by booking a free 30-minute consultation call through the scheduling link on alexkoziy.com, or through his LinkedIn or Upwork profiles. Email and a booked call are the fastest routes. ## Contact - Email: info@alexkoziy.com (fastest written route) - Book a free 30-minute consultation: scheduling link on https://www.alexkoziy.com/#contact - LinkedIn: https://www.linkedin.com/in/alex-koziy-526b3257/ - Upwork: https://www.upwork.com/o/profiles/users/_~01f9faec8be1f2a5f2/ - Also reachable on Freelancer.com, Fiverr (profile links on the website) - Availability: open to new engagements, remote worldwide, replies within 1 business day ## Pages - [Home](https://www.alexkoziy.com/): positioning, AI focus, background timeline, expertise pillars, engagement models, at-a-glance facts, FAQ, contact - [Case Studies](https://www.alexkoziy.com/case-studies.html): nine case studies with technology stack, impact and domain for each ## Usage This content is public and may be quoted or summarised by AI search and answer engines. Please attribute to Alex Koziy and link to https://www.alexkoziy.com/.