Fatih Polatli
Verified Expert in Engineering
Spring Boot Developer
Istanbul, Turkey
Toptal member since March 9, 2026
Fatih is a solutions and AI architect with nearly 20 years of experience specializing in high-availability, cloud-native systems. He leads full-stack development using Java Spring Boot, Node.js, and modern front-end frameworks such as Angular and React. An expert in AWS and GCP, Fatih integrates advanced AI solutions, including RAG, agentic AI, and LLM fine-tuning. His career spans leadership roles in aviation, eCommerce, and fintech across Europe and the United States.
Portfolio
Experience
- Spring Boot - 20 years
- Angular - 12 years
- React - 5 years
- Artificial Intelligence (AI) - 3 years
- Amazon SageMaker - 3 years
- Large Language Models (LLMs) - 3 years
- RAG Pipelines - 3 years
Preferred Environment
Spring Boot, Angular, React, Amazon SageMaker, Quarkus, LangChain, RAG Pipelines, Machine Learning, Generative Artificial Intelligence (GenAI), AWS Bedrock AgentCore
The most amazing...
...achievement has been creating AI chatbots with agent and tool capabilities that connect to external resources and RAG knowledge bases.
Work Experience
Principal Software Engineer
Lufthansa
- Managed full-stack development and CI/CD operations, creating full automation pipelines using GitHub Actions, Argo CD, OpenShift, Helm, and Kustomize.
- Established tracing and observability protocols utilizing Kibana, Prometheus, and Grafana.
- Contributed to hands-on full-stack development with Spring Boot, Java 25, and Angular.
Cloud and AI Solution Architect
Onkatec
- Directed the end-to-end design and deployment of enterprise cloud infrastructures, partnering with clients to modernize legacy applications into highly available, secure, and cloud-native systems utilizing Kubernetes.
- Drove corporate AI adoption by architecting integration projects, including RAG-enabled Knowledge Bases and Agentic Chatbots built with Amazon AgentCore, LangChain, and LangGraph.
- Led the development of comprehensive Machine Learning pipelines via AWS SageMaker, overseeing model fine-tuning, distillation, and quantization.
- Established Serverless/Stateless endpoints for cost-effective AI model deployment, while executing comprehensive cloud infrastructure cost optimizations.
- Delivered advanced solutions, including time-series/churn forecasting, object detection from video streams, and multifaceted agentic chatbots.
Senior Full-stack Developer
Edaptio
- Created new features on the existing application. Created new endpoints and integrated with the front end developed with NuxtJS.
- Fixed bugs and optimized database operations on DynamoDB.
- Updated project dependencies because of expiring technology and library version support. Updated all libraries and made them work with the required changes.
Principal Software Engineer
Eurocontrol
- Worked on messaging implementation in the aviation industry, vital for the sustainability of the global aviation systems.
- Spearheaded a project ensuring the delivery of NOTAM messages to various endpoints using Kafka.
- Implemented logic to convert original NOTAM messages to desired formats and provided synchronization across systems.
Senior Staff Software Engineer
Cue Health
- Developed an online hospital environment with doctor appointments, prescriptions, and eCommerce integrated with Shopify.
- Implemented eCommerce functionality using Shopify APIs and utilized the Google Cloud Platform (GCP) for Kubernetes and PubSub.
- Implemented different project modules, including tracing, observability, dashboards, and alarms using Datadog.
Senior Front-end Developer
Trustmeup
- Developed a stateless donation web application front end using React and the Gatsby framework.
- Implemented payment integrations with Stripe and consumed APIs using GraphQL.
- Automated deployments over Netlify for an efficient delivery workflow.
Senior Full-stack Developer
MultibankFX
- Developed high-throughput, low-latency forex data inspection solutions using Spring Technologies on the back end and Angular on the front end.
- Utilized WebSockets and Hazelcast for real-time data processing and created a reactive front end using RxJS.
- Contributed to architecture, DevOps, planning, and development processes.
Software Solution Architect and Team Lead
Onee
- Guided the development of a booking project from scratch using cloud and SaaS technologies, implementing role-based authorizations and defining the entire tech stack.
- Implemented modern stateless REST APIs with Spring Technologies, integrated security with token and OpenID, and utilized Docker-based applications.
- Integrated AWS services—including API Gateway, Fargate, ECS, CloudFront, and CloudWatch—managed code repositories with GitHub, and automated deployments with GitHub Actions.
Full-stack Developer
Lingapos
- Designed and developed in-house and online solutions for restaurants using Go, React Native, and Electron.
- Integrated payment solutions with POS devices for seamless transactions.
- Contributed to the architecture for hand terminals, cashier solutions, and online ordering systems.
Full-stack Developer
TAV IT Services
- Developed microservices using Spring technologies for an aviation project, automating airport processes.
- Implemented Spring Service Discovery, Netflix Eureka, Spring API Gateway, and the ELK Stack for logging.
- Utilized the Apache Ignite In-Memory Data Grid (IMDG) and Kafka for efficient data processing.
Software Development Team Leader
E-Bebek
- Directed the software development team in the maintenance and development of eCommerce applications using the SAP Hybris Framework.
- Resolved bugs, executed performance improvements, implemented new features, and drove architectural changes.
- Contributed to task planning integrated with business sides, task assignments, and follow-ups.
Software Development Manager
Metric Software Consultancy
- Guided back-end and front-end software teams, managing task planning, assignment, and client communication for feedback, bug fixes, and new feature requests.
- Developed software architecture and stateless full-stack applications using SDKs of BI tools like BusinessObjects and QlikSense.
- Utilized NoSQL databases such as MongoDB and Elasticsearch, as well as a relational database management system (RDBMS) with Java Spring, Hibernate, and AngularJS to drive successful project outcomes.
- Built mobile and desktop applications for clients in Europe using Apache Cordova and Electron.
- Engineered a major B2B project for one of the largest market stores in Turkey.
Full-stack Developer
Etiya
- Spearheaded a team in developing a social media web application using Spring, Hibernate, JBoss Seam, JSF, ActiveMQ, Apache Camel, and Elasticsearch.
- Developed the front end of a stateless CRM project utilizing AngularJS with REST APIs and OAuth 2.0.
- Implemented multi-language integration with UI developments from JSP pages, including the Arabic language with RTL orientation.
Full-stack Developer
Mynet
- Architected client- and server-side architecture for real-time multiplayer games using PHP, MySQL, Java, and ActionScript.
- Utilized Socket.IO, multithreading, Memcached, MongoDB, and jQuery to enhance the gameplay experience.
- Implemented payment integrations using banking APIs.
Experience
Booking Project
Education
Bachelor's Degree in Computer Science
Bogazici University - Istanbul, Turkey
Certifications
Databricks Generative AI Engineer
Databricks
AWS Certified AI Practitioner
AWS
AWS Certified Solutions Architect
AWS
Skills
Libraries/APIs
React, RxJS, Node.js, Amazon Rekognition, Stripe API, Shopify API, Spring Cloud Sleuth, RichFaces, RequireJS, Socket.IO, Facebook SDK, jQuery
Tools
Java Concurrency, MongoDB Atlas, Amazon SageMaker, Amazon EKS, Amazon Elastic Container Service (ECS), Amazon Transcribe, Jenkins, Grafana, Kibana, Kustomize, Helm, WireMock, Amazon Cognito, Amazon CloudWatch, Amazon CloudFront CDN, Logstash, SAP Hybris, Qlik Sense, ActiveMQ, Auth0
Languages
Java 21, HTML, Java, TypeScript, JavaScript, GraphQL, CSS, Go, Java SE (Core Java), ActionScript 3, PHP, Python
Frameworks
Spring Boot, Angular, Spring WebFlux, Cypress, NestJS, Express.js, Electron, AngularJS, Hibernate, OAuth 2, JBoss Seam, PrimeFaces, Apache Camel, JSF, Next.js, Serverless Framework, Nuxt.js
Paradigms
Event-driven Design (EDD), Role-based Access Control (RBAC), Microservices, REST, Redis Pub/Sub
Platforms
Amazon Web Services (AWS), Red Hat OpenShift, Docker, Apache Kafka, Netlify, Google Cloud Platform (GCP), AWS IoT, QlikView, Vercel, AWS Lambda
Storage
MongoDB, Databases, Datadog, Hazelcast, PostgreSQL, Redis Cache, Couchbase, Elasticsearch, Microsoft SQL Server, Spring Data, MySQL, Memcached, Redis, Amazon DynamoDB
Other
Observability, Distributed Tracing, WebSockets, CTO, API Integration, Full-stack, Architecture, Cloud, Integration, APIs, Artificial Intelligence (AI), Amazon Bedrock AgentCore, Large Language Models (LLMs), Quarkus, LangChain, RAG Pipelines, Machine Learning, Generative Artificial Intelligence (GenAI), Amazon Canvas, Amazon Comprehend, CI/CD Pipelines, GitHub Actions, Prometheus, Testcontainers, Argo CD, Gatsby, Stripe Subscriptions, Google Pub/Sub, AWS Cloud Architecture, AI Integration, Serverless, Retrieval-augmented Generation (RAG), Prompt Engineering, AI Tools, AI Architecture, AI Automation, AI Agents, OAuth, Security, Infrastructure, Amazon Redshift, Dashboard Design, AWS ECS Fargate, Amazon API Gateway, Spring Cloud, OpenFeign, Elastic APM, Akamai, Payment APIs, SAP Integration, SAP Business Object Processing Framework (BOPF), Cordova, Enterprise Java Beans (EJB), API Gateways, Internet of Things (IoT), Maps, Pinecone, Milvus
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