Kousha Ghodsizad

Through diverse collaborations across 10+ tech stacks, I've cultivated a simple truth: Great engineering emerges when continuous learning meets cross-functional teamwork.

• Soft Skills: Collaboration & Teamwork, Leadership & Mentorship, Adaptability, Growth-Oriented Mindset

• Programming Languages: Golang, Python, PHP, Shell script

• Cloud & Infrastructure: Kubernetes, Helm, Terraform, AWS, Private Cloud, OpenStack, Cilium, HashiCorp Vault/Consul, Nexus, Harbor

• CI/CD & DevOps: GitLab CI/CD, Jenkins, Templating, ArgoCD, Argo Workflows, Argo Events Argo Rollouts, JFrog, Prometheus, Grafana, ELK Stack

• Databases: SQL/NoSQL, MySQL, PostgreSQL, Cassandra, Redis, Elasticsearch, MongoDB

As an Infrastructure Developer at Adyen since July 2023, I have been instrumental in designing and developing advanced Continuous Integration and Continuous Deployment (CI/CD) solutions, leveraging a diverse set of technologies to enhance operational efficiency and system reliability.

• AdyenCLI Development: Engineered AdyenCLI, a Golang-based command-line interface (CLI) application serving as a platform for executing plugins developed in Java, Go, Bash, and Python. Utilizing gRPC, I ensured secure and permission-based interactions with these plugins, facilitating seamless execution on user laptops.

• High Availability Deployment: Deployed AdyenCLI across four distinct Kubernetes clusters in different regions, managing DNS with HashiCorp Consul to direct requests to the nearest healthy service. This setup, combined with JFrog for federated plugin serving, achieved 99.999% availability globally.

• Workflow Automation with Argo: Designed and implemented highly available workflows using Kubernetes and Argo Workflows. By integrating Kubernetes’ leader election mechanism with Argo CD and Argo Events, I established a system that ensures continuous workflow execution across multiple clusters, maintaining 99.999% availability.

• Code Journey Project: Developed Code Journey, a system that aggregates data from GitLab, Jenkins, and other CI/CD tools, along with logs and metrics, storing them in a NoSQL database. This platform empowers developers to monitor critical data for merge requests and trace code changes post-deployment.

• Contribution Automation Development: Created a GitLab merge request and pipeline management system that receives GitLab webhooks and utilizes the GitLab API to update merge requests. This system interacts with services like Jenkins and Mattermost, allowing users to define specific workflows per repository, such as assigning reviewers, running pipelines, notifying developers, and analyzing code changes.

Tech stack:

• Programming Languages: Proficient in Golang, Python, Shell, and PHP, with extensive experience in developing secure and efficient applications.

• Infrastructure and Cloud Technologies: Experienced with private cloud environments, including OpenStack, and proficient in using Terraform for infrastructure as code.

• Containerization and Orchestration: Skilled in deploying and managing applications using Kubernetes, ensuring high availability and scalability.

• CI/CD Tools: Experienced with GitLab for version control and CI/CD pipelines, and JFrog for artifact management.

• Workflow Automation: Proficient in using Argo Workflows, Argo Events, and Argo CD for automating and managing complex workflows in Kubernetes environments.

• Monitoring and Observability: Implemented systems for aggregating and analyzing logs and metrics to provide insights into application performance and health.

Adyen is a Dutch financial services company that offers a comprehensive payment platform, enabling businesses to accept e-commerce, mobile, and point-of-sale payments. Founded in 2006, Adyen has expanded its global presence, operating in 27 offices worldwide and employing over 4,000 people from more than 115 nationalities.

As a Senior Software Engineer at StuDocu, I led critical projects to enhance system performance and observability. Collaborating with cross-functional teams, I implemented solutions that improved website efficiency and reliability.

• Enhanced Website Performance: Collaborated with the Platform team to optimize website performance and improve crawler accessibility, leading to a more efficient and user-friendly service.

• Integrated Monitoring Tools: Worked closely with the Operations team to implement monitoring tools across local, staging, and production environments, significantly enhancing system observability and reliability.

• Optimized System Efficiency: Identified and resolved performance bottlenecks in the codebase and database, achieving a 40% improvement in overall system performance.

• Developed CI/CD Pipelines: Created GitHub CI/CD pipelines for SEO and performance testing of the core project, streamlining deployment processes and ensuring consistent quality.

• Conducted Performance Workshops: Led workshops focused on system performance analysis and optimization, fostering a culture of continuous improvement within the engineering team.

Technical Skills: Object-Oriented Programming (OOP), Agile Methodologies, Test-Driven Development, DevOps, Big Data, Kanban, Design Patterns

Technologies: Laravel, Amazon Web Services (AWS), MySQL, Redis, Go (Programming Language), PHP, Elasticsearch, Terraform

StuDocu is an EdTech startup based in Amsterdam, Netherlands, providing a peer-to-peer resource-exchange platform for students to share study aids, class notes, and test preparation materials. Founded in 2013, StuDocu serves over 60 million students monthly across more than 60 countries.

As a Senior Software Engineer and Team Lead at Kolay, I led the development and optimization of key HR management systems, focusing on enhancing operational efficiency and scalability. Collaborating with cross-functional teams, I implemented robust solutions to streamline processes and improve system performance.

• HR System Development and Refactoring: Led the overhaul of the HR system using Test-Driven Development (TDD) and technologies such as Laravel, Go, PostgreSQL, Modular Architecture, Domain-Driven Design (DDD), Redis, RabbitMQ, and AWS, resulting in improved system reliability and maintainability.

• Expense Management Module Creation: Spearheaded the development of the Expense Management module with Laravel, PostgreSQL, and AWS, enhancing operational efficiency and streamlining financial processes.

• Microservices for Data Management: Developed and implemented microservices for large-scale data imports and exports using Node.js, Golang, Kubernetes, ElastiCache, Amazon S3, SQS, and AWS Lambda, ensuring robustness and scalability.

• Scalable Queue Handler Engineering: Engineered a scalable queue handler integrated with Slack to manage failure messages and provide real-time reporting, utilizing TDD, Laravel, PHP, SQS, AWS, Golang, and Kubernetes, leading to enhanced system performance.

Technical Skills: Concurrent Programming, Object-Oriented Programming (OOP), Data Security, Agile Methodologies, Test-Driven Development, Cloud Security, DevOps, Scrum, Design Patterns, Microservices

Technologies: Laravel, RabbitMQ, Amazon Web Services (AWS), MySQL, Redis, Go (Programming Language), PHP, GraphQL, MongoDB, Elasticsearch, Python (Programming Language), Terraform

Kolay is a comprehensive human resources management platform designed to streamline various HR functions for businesses of all sizes. The platform offers tools for employee scheduling, payroll management, and compliance tracking, enhancing operational efficiency.

As a Senior Software Engineer and Team Lead at Wingie Enuygun Group, I led the Hotel team in integrating new providers and enhancing system performance. Through mentorship and collaboration, we achieved significant improvements in testing culture, data processing, and system scalability.

• Provider Integration and System Maintenance: Guided the Hotel team in maintaining existing systems and integrating new providers, including Webbeds, OtelZ, and Juniper, expanding our service offerings and ensuring seamless operations.

• Cultivated Test-Driven Development (TDD) Culture: Organized multilayer testing workshops to promote a robust TDD culture, resulting in improved code quality and reliability across the team.

• Optimized Search Functionality: Enhanced product search capabilities by refining the Elasticsearch index and implementing an efficient data pipeline, leading to faster and more accurate search results.

• Developed Provider Hub: Designed and implemented a provider hub using Go and gRPC to manage concurrent requests, efficiently fetching and standardizing hotel data from various providers.

• Implemented Content Caching Microservice: Developed a microservice for content caching management, introducing an automated cache rate management system based on hit and miss rates, which improved data retrieval times and reduced server load.

• Database Cluster Migration: Successfully migrated the product database from a master-slave configuration to a Galera cluster, achieving zero data loss and enhancing database reliability and performance.

Technical Skills: Object-Oriented Programming (OOP), Test-Driven Development (TDD), DevOps, Scrum, Big Data, Design Patterns, Microservices Technologies: Amazon Web Services (AWS), MySQL, Go (Programming Language), PHP, MongoDB, Symfony, Elasticsearch, gRPC, Galera Cluster

Wingie Enuygun Group is a prominent player in the online travel industry, offering comprehensive flight booking services through platforms like Wingie and Enuygun. The company leverages advanced technologies to provide users with seamless travel planning experiences.

As a Senior Software Engineer at Insider, I led the maintenance and refactoring of the newsletter product, collaborating with a team of one senior and six mid-level developers. My efforts focused on system architecture redesign, security enhancements, and data migration to improve performance and compliance.

• System Architecture Redesign: Separated the newsletter product panel from the main application, implementing a microkernel architecture with a repository-service pattern to enhance modularity and maintainability.

• Security Enhancements: Identified and resolved security vulnerabilities within the newsletter product, ensuring compliance with Huawei’s stringent security standards.

• Email Service Overhaul: Transitioned the email delivery and tracking system from a PHP-based monolithic structure to a Go-based microservices architecture, improving scalability and performance.

• Data Migration: Executed a seamless migration of legacy data from MySQL to Apache Cassandra and ClickHouse databases, achieving zero data loss and enhancing data retrieval speeds.

• Queue System Upgrade: Upgraded the messaging queue system from Amazon SQS to RabbitMQ, significantly increasing the message size capacity from 256 KB to 120 MB, facilitating more robust data handling.

• A/B Testing Implementation: Developed a comprehensive A/B testing framework for the newsletter service, enabling data-driven decision-making and optimizing email campaign effectiveness.

• Spam Detection Service: Designed and implemented an email spam detection service, enhancing deliverability rates and maintaining the newsletter’s sender reputation

Technical Skills: Object-Oriented Programming (OOP), Data Security, Test-Driven Development (TDD), DevOps, Scrum, Design Patterns, Microservices

Technologies: Laravel, Amazon Web Services (AWS), MySQL, Apache Kafka, Redis, Go (Programming Language), PHP, MongoDB, Kubernetes, Docker, Cassandra, ClickHouse, RabbitMQ

Insider is a leading AI-powered marketing platform founded in 2012 in Istanbul, Turkey. The company specializes in optimizing marketing strategies by connecting data and predicting user behavior, enabling marketers to create personalized, cross-channel customer experiences at scale.

As Senior Software Engineer and Head of Development at Bamilo, Iran's leading online marketplace, I led the development of key systems and managed a growing team to enhance operational efficiency and user experience.

• Team Leadership: Initiated and expanded the development team, fostering a collaborative environment to drive product innovation and system enhancements.

• Performance Management Portal (PMP): Developed a centralized system for Bamilo’s warehouse operations, enabling real-time monitoring, analysis, and optimization of processes to boost efficiency and productivity.

• Seller Center System: Designed and implemented a comprehensive platform for sellers to manage products, orders, and customer interactions, enhancing the marketplace experience.

• Data Migration: Engineered an online data pipeline using Kafka to seamlessly migrate all Seller Center products, ensuring zero data loss and system continuity.

• Delivery Management Service: Developed a nationwide package delivery tracking system, optimizing routes and monitoring delivery personnel to improve logistics efficiency.

• Inventory Management: Addressed data collision issues in the main product inventory stock check service by creating a product-based load balancer microservice, ensuring accurate stock levels.

Technical Skills: Leadership, Object-Oriented Programming (OOP), Management, Design Patterns, Microservices

Technologies: Laravel, RabbitMQ, Amazon Web Services (AWS), MySQL, Apache Kafka, DevOps, Scrum, Redis, Go (Programming Language), PHP, GraphQL, MongoDB, Kubernetes, Cassandra

Bamilo was an e-commerce marketplace in Iran, offering a wide range of products including electronics, fashion, and home appliances. Founded in 2014, the company operated until March 2019.

Collaborated with internal teams to create an innovative suggestion system for private organizations, streamlining communication and fostering innovation.

• Collaborated with internal teams to create an innovative suggestion system for private organizations, streamlining communication and fostering innovation.

• Designed a user-friendly task management solution for private organizations, enhancing productivity and workflow efficiency.

• Developed a custom social network for organizations using PHP-Fox, prioritizing collaboration, privacy, and security.

• Built a form builder and workflow module for PHP-Fox, simplifying data collection and process automation with an intuitive interface.

• Created a mobile application API for seamless PHP-Fox social network integration, ensuring compatibility across devices and operating systems.

• Constructed a task list management system for government organizations, improving efficiency, accountability, and reporting capabilities.

• Developed a meeting management system for government organizations,optimizing scheduling, resource allocation,and seamless coordination with existing tools.

Tech stack: Linux · PHP · JavaScript · Python · Node.js · SQL · MySQL · Redis · MongoDB · RabbitMQ · Design Patterns · OOP · Teamwork.

Ensured microservices' security by checking and rehabilitating them against hacking attacks.

• Collaborated with the Supernova and Microservice teams to develop new features and maintain the product and services.

• Redesigned and developed the deal submission, product listing, and product detail pages using GraphQL.

• Developed a GDPR-compliant image microservice that applies requested filters and can handle over 5,000 unique images per minute using 20 instances.

• Checking and rehabilitating microservices against hacking attacks.

• Improved the functionality of our microservices near cache by customizing loadbalancing.

Tech stack: Go · Microservice · Kubernetes · PHP · Laravel · GraphQL · OOP · Design Patterns · TDD · ElasticSearch · Redis · AWS.

Designing Innovative GIS & GPS-based Android Apps: A Study of the Research and Development Process and its Impact on User Satisfaction

This research study examined the research and development process for designing innovative GIS & GPS-based Android apps and its impact on user satisfaction. The study involved researching and analyzing trends in GIS & GPS technology, collaborating with a multidisciplinary team to develop and test app concepts, and gathering user feedback to inform app improvements. The study findings can inform future GIS & GPS-based app design and development, as well as contribute to the academic community’s understanding of the impact of the research and development process on user satisfaction.

Enhancing Search and Rescue Robot Performance through Algorithmic Innovations: A Study of the Development, Testing, and Implementation of Novel Algorithms for Router Robots

This research study investigated the development, testing, and implementation of novel algorithms for router robots in search and rescue (SAR) scenarios. The study focused on optimizing search efficiency, obstacle avoidance, and communication to enhance SAR robot performance. The research involved assessing existing algorithms, exploring potential enhancements, and collaborating with robotics developers to implement improvements. The study findings can inform future SAR robot design and development, as well as contribute to the academic community’s knowledge of algorithmic innovations for SAR robots.