Mark Kajcsos

• Develop and maintain backend services for a global e-commerce platform
• Primary focus: Backend development using Node.js and TypeScript
• Participate in key software architecture decisions, alongside the lead engineer
• Plan, design, and implement robust APIs (GraphQL and REST)
• Manage and execute data migrations across systems
• Mentor and guide new team members during their onboarding period
• Collaborate closely with Frontend and business teams to align technical and business goals
• Work with a stack that includes Node.js, TypeScript, GraphQL, MongoDB, Elasticsearch, Azure, Git/GitHub, Swagger, Grafana, Next.js, HubSpot, and Shopify

• Developed custom devices and software as private entrepreneur
• Managed overall equipment building and support, including electronic circuitry and mechanical parts from design to implementation
• Raspberry based web application development
• Specialized in custom desktop or web application development
• Most relevant technologies: Industrial equipments, Python, Node.js, Typescript, Express, FastApi, Flask, Docker, Linux, Git, SQL, Modbus, IO-Link

• Backend development of Web applications for multiple customers in media, manufacturing and pharmacy industry.
• Contributing for system/software architecture and core business logic decisions
• Involved in quality assurance stage of software development and deployment
• Responsibility of automated and manual tests to ensure software quality
• Strict cooperation with PO, DevOps and Frontend team
• Main role: Backend development by Node.js/Typescript
• Side role: mentoring new colleagues
• Side projects: local tool and API development for ML team by Python
• Most relevant technologies: Linux, NodeJs, TS, Python, MongoDB, Postgres, MySql, Redis/PubSub, Kafka, GraphQL, GitHub, GCP, Swagger, Docker, Kubernetes, Helm, Grafana, Prometeus, Loki, Vue.js

• Backend development for CNC control systems of machines (Siemens and Fanuc)
• Contributed to frontend development tasks
• Machine data collection and distributing by UDI, MQTT, OPC-UA, MTConnect, Apache Kafka
• Most used technologies: .NET Core, C#, Azure, Jenkins, Git, Angular 8+

• Developed desktop and web applications using C#, NodeJs and Python.
• Led a team of developers
• Created companywide tools for data collection, finance, and management purposes
• Production site equipments and machines supporting remotely and onsite
• Monitored and supported databases for various departments
• Maintained communication with external supplier and developer companies
• Most used technologies: .NET/C#, Nodejs/Typescript, Python, MSSQL,, Git, Grafana, Docker, Kafka

• MES (Manufacturing Execution System) software development and cooperation with core developer team
• Support MES implementation and initialization in different countries
• Managed requirements at corporate and site-specific level
• Machine data collection by different message broker technologies and its analyzation
• Most used technologies: C#, Node.js, Angular

• Desktop application development for production site machines in automotive industry
• Framework development
• Data collection and its analyzation to be able to improve tack time of machines
• Strict cooperation with German colleagues on site (Stuttgart) and Hungarian ones at Budapest
• As first member of Hungarian team, knowledge sharing and support responsibilities
• Local tool development
• Most used programming languages are C, C#, LabView, Batch, PowerShell

• ASIC verification
• E and VHDL programming
• Tool developing in Java

• Electrical circuit design
• PCB design wit Eagle
• VHDL programming on Xilinx FPGA
• Desktop app development with C++