Zoltán is available for hire
Hire ZoltánZoltán Fődi
Verified Expert in Engineering
Software Developer
Budapest, Hungary
Toptal member since January 27, 2020
Bio
Zoltán is a back-end developer with some experience on the front end. He started his profession in 1997, and since then, he's encountered and made the best use of various technologies. A love for learning and an innate curiosity have led to Zoltán accumulating an extensive knowledge base. While he works well in teams, Zoltán can also deliver on his own and has led teams to deliver projects on time and according to plan.
Portfolio
Voyage AI Innovations Inc.
Python, GitHub, React, Node.js, TypeScript
Conway & Co B.V.
Docker, PostgreSQL, Google Cloud Platform (GCP), Java, Spring Boot, Terraform...
Pluralsight - Digital
Amazon Web Services (AWS), Zuora, TypeScript 3, Node.js, Back-end, GitHub...
Experience
- Java - 15 years
- AWS Lambda - 5 years
- Spring Boot - 5 years
- Python - 5 years
- AWS Step Functions - 4 years
- JHipster - 3 years
- Docker - 3 years
Work Experience
Python Developer
2024 - 2025
Voyage AI Innovations Inc.
- Integrated Voyage AI embeddings API to several tools and vector databases, like LlamaIndex, LangChain, Weaviate, Chroma, Elasticsearch, Unstructured, etc.
- Created example code for the integrations on how to use Voyage AI models through the integration.
- Evaluated the new Voyage AI models using a self-developed, MTEB-like tool. (RTEB).
- Charged with taking care of the user management code, focusing on the rate-limiting records.
- Created API endpoints for the voyage.ai UI. (Python and FastAPI).
Technologies: Python, GitHub, React, Node.js, TypeScript
Python Back-end Developer
2023 - 2023
Conway & Co B.V.
- Laid down the CI/CD pipeline using GitHub Actions, Terraform, GCP, Snyk, and Sonar.
- Created the base application and implemented some initial features using Java and Spring Boot.
- Introduced a data modeling tool to speed up the development process.
Technologies: Docker, PostgreSQL, Google Cloud Platform (GCP), Java, Spring Boot, Terraform, Google Cloud, React, GitHub
Java Developer
2022 - 2023
Pluralsight - Digital
- Did a total refactoring on an application that deals with integration with external services.
- Tracked and fixed payment and subscription problems in Zuora for a global online education platform.
- Helped the team solve the problem that arose after RBI's regulation around recurring payments.
Technologies: Amazon Web Services (AWS), Zuora, TypeScript 3, Node.js, Back-end, GitHub, Microservices, JavaScript, TypeScript
Python Developer
2022 - 2022
DecisionIQ
- Created an app that collects Monitron sensor (IoT device) data and sends alarms based on predefined rules.
- Used AWS serverless services for the above application.
- Reduced the maintenance cost of the above application to almost $0.
Technologies: Python, Amazon EC2, AWS Lambda, Amazon S3 (AWS S3), Amazon Web Services (AWS), Serverless Architecture, GitHub
Back-end Developer (Python/AWS Lambda)
2020 - 2021
Toptal Client
- Developed and maintained several API integrations.
- Designed the integration with other external systems.
- Tracked bugs in Jira and also helped other developers with the onboarding.
Technologies: Python, Serverless, Agile Software Development, AWS Lambda, Docker, PostgreSQL, AWS Step Functions, Amazon S3 (AWS S3), Amazon DynamoDB, APIs, REST, Amazon Web Services (AWS), REST APIs, GraphQL, Git, JSON, Jira, Linux, SQL, Serverless Framework, RDBMS, RESTful Services, Solution Architecture, DevOps, Python 3, API Integration, Back-end, GitHub, Microservices, Serverless Architecture
Technical Architect
2016 - 2020
GE Capital, WCS
- Designed and created an automated credit-decision engine in Java and Python.
- Created a past-due prediction application in Python using free text-based classification on invoice comments.
- Designed and created a reporting application using Java and JReport.
Technologies: Spring Boot, Spring, Java, Apache Maven, JUnit, Docker Compose, Java 8, Agile Software Development, Oracle RDBMS, AWS Lambda, AWS Step Functions, Amazon S3 (AWS S3), APIs, REST, Amazon Web Services (AWS), REST APIs, Serverless, Git, Architecture, Swagger, Python, JSON, Jira, Linux, SQL, Serverless Framework, RDBMS, Hibernate, RESTful Services, CI/CD Pipelines, Solution Architecture, DevOps, Python 3, Software Architecture, API Integration, Back-end, Microservices, Serverless Architecture
Software Architect
2013 - 2016
GE Capital, EMEA HQ
- Designed several applications related to GE's European businesses; worked as part of the development team and developed parts of the applications.
- Created and designed a document management system to hold over 10 million documents.
- Developed an application in Java that automatically migrated the old CMS content to Liferay.
Technologies: Spring, Java EE (Jakarta EE), Java, Apache Maven, JUnit, Java 8, Agile Software Development, Oracle RDBMS, APIs, REST, REST APIs, Git, Architecture, Swagger, JSON, Jira, Linux, SQL, RDBMS, Hibernate, RESTful Services, SOAP, CI/CD Pipelines, Solution Architecture, Software Architecture, MySQL, Back-end
Integration Team Technical Lead
2010 - 2013
Budapest Bank, GE Capital
- Built the MW team from scratch and created all the rules and processes for how the team works.
- Constructed an ESB using IBM Message Broker and some Java embedded code.
- Created a service registry and repository Java application that identifies and describes all the provided services.
Technologies: IBM MQ, Java, Oracle RDBMS, Git, JSON, SQL, RDBMS, Hibernate, RESTful Services, SOAP, GWT
Experience
Automated Credit Decision Application
A Java and Python-based application that makes the final decision on buying invoices, also known as factoring.
The application receives basic information about an invoice, like parties, amount, addresses, and others. The application then identifies the parties, fetches business information like balance sheets and stock prices, applies different rules and decision strategies, and combines the results into a single decision.
The application receives basic information about an invoice, like parties, amount, addresses, and others. The application then identifies the parties, fetches business information like balance sheets and stock prices, applies different rules and decision strategies, and combines the results into a single decision.
Education
1994 - 1997
Bachelor's Degree in Programming Mathematics
József Attila University - Szeged, Hungary
Skills
Libraries/APIs
REST APIs, Node.js, React
Tools
JHipster, AWS Step Functions, Docker Compose, Apache Maven, Git, GitHub, IBM MQ, Spring Roo, Jira, Terraform, Skaffolder
Languages
Java 8, Python, Java, SQL, Python 3, GraphQL, TypeScript 3, JavaScript, TypeScript
Storage
JSON, Amazon S3 (AWS S3), Amazon DynamoDB, Oracle RDBMS, PostgreSQL, RDBMS, MySQL, Google Cloud
Frameworks
Spring Boot, Serverless Framework, Hibernate, Spring, Angular, JUnit, Swagger, Flask, GWT
Paradigms
Agile Software Development, REST, Microservices, Serverless Architecture, DevOps
Platforms
AWS Lambda, Docker, Kubernetes, Amazon Web Services (AWS), Java EE (Jakarta EE), Linux, Amazon EC2, Google Cloud Platform (GCP)
Other
Serverless, APIs, Architecture, RESTful Services, SOAP, CI/CD Pipelines, Solution Architecture, Software Architecture, API Integration, Zuora, Back-end, FastAPI
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