Nab R.-Senior IT Consultant
Check rate
Experience
Freelance Senior IT Consultant
FourEnergy GmbH
Freelance Senior IT Consultant
HR Solutions GmbH
Freelance Senior Linux and DevOps Specialist
G.i.N. GmbH
Full-Stack Developer
Nextrend GmbH
Software Developer and Linux Administrator
ALGI Alfred Giehl GmbH&Co.KG
Software Developer and DevOps Engineer
TRIP INN Management & Service GmbH
Research Assistant, Data Analyst and Data Engineer
Universität Leipzig
Fullstack Developer
Atruvia
Atruvia
Project Objective:
Integration of the “Wunscherfüller” feature into the VR Banking App to offer private customers an innovative solution for flexible and autonomous wealth building. The goal was to create added value for Volksbanken and their customers and to promote the “Mobile First” and “Omnichannel Bank” strategies.
Responsibilities:
- Analysis of customer requirements and design of a modular and scalable architecture for integrating the “Wunscherfüller” feature into the VR Banking App
- Development and integration of frontend components with Angular and TypeScript to ensure a user-friendly and intuitive interface
- Use of Angular Web Components, including registration and configuration of custom components using ngDoBootstrap and specific Angular libraries
- Development of backend components with Java and Spring Boot, including features such as “rounding up transactions” and “flexible savings amounts”
- Use of the Spin framework (an internal banking extension of Spring Boot) to implement microservices with features such as service discovery, health checks, logging and tracing
- Implementation and optimization of secure and efficient REST APIs for communication between frontend and backend
- Integration of security measures with Spring Security, including JWT authentication and API protection measures
- Integration of an impulse manager to increase customer interaction and promote long-term investments
- Containerization of web components with Docker and deployment in an OpenShift environment across several development stages (Development, Integration, Final System Integration)
- Setup of a CI/CD pipeline with Jenkins to automate build, test and deployment processes
- Execution of unit, integration, interface and end-to-end tests with Jest, JUnit, Mockito and Postman to ensure software quality
- Application of the SAFe Framework (Scaled Agile Framework) for efficient cross-team collaboration and continuous feature improvement
- Creation of technical implementation documentation in Confluence and handover to the maintenance team
Tech-Stack: Angular, TypeScript, Java, Spring Boot, Spin-Framework, REST-APIs, Microservices, Docker, JWT, Spring Security, Jenkins, Postman, Jest, JUnit, Mockito, OpenShift, Git, Elasticsearch, Kibana, Jira, Confluence
Methods: CI/CD, Test-Driven Development (TDD), SAFe, Domain-Driven Design (DDD)
Programmer / Linux Administrator
Elevator Manufacturing Company (ALGI Alfred Giehl GmbH & Co. KG)
Elevator Manufacturing Company (ALGI Alfred Giehl GmbH & Co. KG)
Project Objective:
Optimization and further development of the IT infrastructure and software solutions to support production and business processes. The goal was to increase efficiency and automation in warehouse and order management as well as print template management, and to improve ERP system integration.
Responsibilities:
- Administration and maintenance of Linux servers (e.g. Ubuntu, CentOS), including installation, configuration and monitoring of applications
- Configuration and management of network services such as DNS, DHCP and VPN to support internal and external communication processes
- Setup and monitoring of security measures such as firewall rules, SSL/TLS certificates and IAM access policies to ensure IT security
- Management and configuration of virtual machines with VMware for efficient resource utilization and provision of isolated development and production environments
- Creation and management of snapshots and backups to ensure data availability and recoverability
- Setup and use of monitoring and logging tools such as Nagios, Elasticsearch, Kibana and Logstash for infrastructure monitoring and rapid error diagnosis
- Customization and extension of the Abas ERP system, including implementation of new modules and adjustment of database structures in SQL to support specific business requirements
- Integration of report generation with Jaspersoft into the ERP system for seamless business processes
- Further development and maintenance of B2B web applications with PHP and the Laravel framework to enable automated business processes and customer communication
- Creation of interactive and user-friendly frontend components with Vue.js and JavaScript
- Development of dynamic print templates with Jaspersoft for invoices, production data and delivery documents
- Automation of ordering processes and connection to external supplier systems to increase supply chain efficiency, reduce errors and shorten processing times
- Automation of routine tasks and system maintenance with shell scripts, e.g. for user management, network monitoring and system updates
- Further development of a warehouse management system by implementing new features for inventory control and real-time data updates
- Analysis and resolution of errors in production environments to minimize downtime and maximize system availability
- Participation in an agile environment following Kanban, including regular sprint planning, stand-ups and retrospectives to promote team collaboration and continuous improvement
Tech-Stack: Linux (Ubuntu, CentOS), Shell, Bash, SSL/TLS, DNS, DHCP, VPN, Nagios, VMware, SQL, Elasticsearch, Logstash, Kibana, JavaScript, Java, PHP, Laravel, Vue.js, Jaspersoft, Abas ERP System
Methods: Kanban
Senior Linux and DevOps Specialist
Automotive Application & Engineering Services (GIN.DE)
Automotive Application & Engineering Services (GIN.DE)
Project Objective:
Design and implementation of a monitoring system for effective monitoring of services (e.g. web services, API applications) and IT infrastructures. The goal was to ensure high availability and functionality through visualization, alerting and analysis of system states, supplemented by regular maintenance and optimization.
Responsibilities:
- Gathering, analyzing and refining business requirements to define a scalable and maintainable monitoring system
- Creation of an architecture design focused on security, scalability and user-friendliness
- Setup of Prometheus for collecting and storing metrics and integration with Grafana for visualizing system states and creating custom dashboards
- Installation and configuration of Elasticsearch and Kibana for log analysis and visualization of log data
- Setup of alerting systems in Grafana to notify users of critical system states and events
- Integration of Matrix Synapse for automated alerting and notification of critical events
- Use of PostgreSQL as the central database system for storing and efficiently querying monitoring data
- Implementation of security measures such as SSL/TLS encryption and IAM-based access control to secure system integration
- Analysis and optimization of network connections and services using TCP/IP to improve performance and reliability
- Automation of tasks with Bash and shell scripts to increase the efficiency of system administration
- Development of automation and integration solutions with Python for more complex workflows
- Development and maintenance of REST APIs for connecting external systems and data sources
- Administration and optimization of Linux systems (Ubuntu, CentOS) to ensure stability and security
- Management and configuration of Nginx as a web server for routing and providing web applications
- Execution of integration tests to ensure proper interaction between Prometheus, Grafana and Matrix Synapse
- Simulation of alert events to verify notification functions
- Creation and maintenance of system architecture and configuration documentation in Confluence
- Collaboration in an agile environment using Kanban, including prioritization and visualization of tasks in Jira to optimize workflows
Tech-Stack: Linux (Ubuntu, CentOS), Docker, Bash, Shell, Python, Prometheus, Grafana, Elasticsearch, Kibana, PostgreSQL, Nginx, SSL/TLS, TCP/IP, REST-APIs, Git, Jira, Confluence, Matrix Synapse
Methods: CI/CD, Kanban, Waterfall
Senior Linux and DevOps Specialist
Automotive Application & Engineering Services (GIN.DE)
Automotive Application & Engineering Services (GIN.DE)
Project objective:
Design, development, and automation of a scalable and high-performance monitoring system (data logger) to increase efficiency and ensure quality in vehicle manufacturing processes. The goal was to create a robust infrastructure for real-time monitoring, analysis, and long-term optimization of production data.
Responsibilities:
- Containerization of applications with Docker to provide a consistent and portable runtime environment for development, test, and production environments
- Development and management of complex Helm charts for the efficient deployment of containerized applications in Kubernetes, with a focus on modularity and reusability
- Definition and management of Kubernetes objects such as Deployments, Services, ConfigMaps, and Secrets based on Helm charts to build a scalable and secure infrastructure
- Configuration and optimization of cluster resources such as CPU, memory, and network policies to maximize application performance and reliability
- Implementation of Horizontal Pod Autoscaling (HPA) and Custom Metrics for automatic scaling based on workload metrics
- Enforcement of security policies through PodSecurityPolicies in Kubernetes environments and their integration into Helm charts
- Use of Istio as a service mesh to manage communication policies between microservices
- Integration of Prometheus and Grafana to collect and visualize metrics at cluster and application level
- Implementation of a centralized logging system with the ELK stack (Elasticsearch, Logstash, Kibana) for fast error diagnosis and system optimization
- Simulation of stress tests and network disruptions to validate the resilience and error handling of the Kubernetes environment
- Execution of pod and service integrity tests with Kubernetes-native tools such as Kubeaudit and Kubeval to ensure the security, stability, and functionality of the Kubernetes environment
- Automation of the release and update process for Helm charts through integration into GitLab CI/CD pipelines
- Use of Helm commands for version control and rollbacks in case of faulty deployments
- Development of Bash and Python scripts to automate recurring tasks such as resource creation and monitoring
- Creation of comprehensive documentation for Helm charts, Kubernetes configurations, and CI/CD workflows in Confluence to facilitate knowledge retention and handover to teams
- Work in an agile environment according to Scrum and Kanban, with iterative optimization of the Kubernetes infrastructure based on sprint retrospectives
- Collaboration in interdisciplinary teams to integrate Kubernetes into existing systems
Tech-Stack: Kubernetes, Docker, Helm, Istio, Prometheus, Grafana, Elasticsearch, Logstash, Kibana, GitHub, GitLab CI, Bash, Python, Confluence
Methods: Scrum, Kanban, CI/CD
Backend Developer
E-Commerce
E-Commerce
Project objective:
Development of an AWS-based, serverless e-commerce shop to provide a scalable, cost-effective, and highly available platform. The goals were to optimize performance, reduce operating costs, and create a flexible architecture for future extensions.
Responsibilities:
- Analysis of the existing backend architecture and definition of requirements for migration to a serverless infrastructure
- Design and management of APIs with Amazon API Gateway for secure and scalable communication between frontend and backend components as well as existing services
- Development of serverless backend functions with AWS Lambda for real-time processing of API requests and workflows
- Management of cloud resources and configuration of multiple AWS accounts with AWS Organizations, including the setup of Service Control Policies (SCPs) to comply with security and compliance policies
- Storage and management of structured data in Amazon DynamoDB and relational data in Amazon RDS for fast and reliable data access
- Ensuring secure storage of raw and processed data in Amazon S3
- Integration of Amazon Kinesis Data Firehose to collect and load streaming data into S3
- Execution of ad hoc queries with Amazon Athena and visualization of data with Amazon QuickSight to support decision-making
- Decoupling and optimization of components with Amazon SQS and implementation of message notifications with Amazon SNS
- Management of container orchestration with Amazon ECS and use of ECS Anywhere for flexible deployment to the AWS Cloud
- Establishment of a dedicated network connection with AWS Direct Connect to minimize latency and increase security during data transfer between local systems and the AWS Cloud
- Implementation of centralized identity management with AWS IAM Identity Center for secure management of user access rights
- Monitoring and logging of activities in the AWS environment with AWS CloudTrail for compliance and auditing
- Use of AWS Systems Manager for insights into operational processes and automation of operational workflows
- Participation in a Scrum team for continuous improvement and flexible adaptation to new requirements
- Conducting pair programming sessions to improve code quality and knowledge sharing within the team
Tech-Stack: AWS (Lambda, Direct Connect, Systems Manager, Organizations, IAM, CloudTrail), Amazon (API Gateway, SQS, SNS, DynamoDB, S3, Kinesis Data Firehose, Athena, QuickSight, ECS, ECS Anywhere, RDS), Jira, Confluence
Methods: Scrum, Pair-Programming
Backend Developer
E-Commerce
E-Commerce
Project objective:
Development and implementation of microservices for calculating product prices with different ordering options. The goal was to create a flexible and extensible solution that enables dynamic pricing and efficient processing of order parameters.
Responsibilities:
- Setup of a Java Spring Boot project with Spring Initializr for the rapid creation of a microservice, including configuration of relevant dependencies such as Spring Web for REST APIs, Spring Data JPA for database access, H2 for testing, and Lombok to reduce boilerplate code
- Definition and modeling of entities such as item, color, and additional option, including the definition of relationships and mappings between entities in JPA
- Configuration of application properties for seamless integration and use of the H2 database
- Implementation of repository interfaces for CRUD operations to manage entities and extension of the JPA repository for specific requirements
- Development of service classes for processing business logic, especially methods for dynamically calculating the total price based on selected options and colors
- Creation of a REST API-based controller with endpoints for price calculation and definition of the API interfaces
- Implementation of global error management to provide meaningful error messages and consistent error handling
- Writing and execution of unit tests for service methods and integration tests for the controller with JUnit and Spring Boot Test to ensure code quality
- Validation of API endpoints and service methods using Postman to ensure the integrity and accuracy of price calculations
- Use of Maven to manage project dependencies and automate build processes
- Management of source code with Git, including the use of branching and merging strategies for effective teamwork
- Collaboration in the Scrum team, regular participation in meetings such as daily stand-ups, sprint planning, and retrospectives to promote teamwork and continuous improvement
Tech-Stack: Java, Spring Boot, Spring Initializr, REST-APIs, Spring Web, Microservices, Spring Data, JPA, Maven, JUnit, Spring Boot Test, Git, Postman, H2, IntelliJ IDEA, Lombok, data.sql, Jira, Confluence
Methods: Scrum
Full-Stack Developer
E-Commerce
E-Commerce
Project objective:
Digitalization and optimization of e-commerce processes with a focus on increasing efficiency, scalability, and data integrity. The main tasks included automating accounting, developing a warehouse management system, and connecting a goods delivery system via a REST API. Results: faster order processing, optimized warehouse processes, and improved data security.
Responsibilities:
- Analysis and specification of requirements for the goods delivery and warehouse management system, as well as for displaying and automatically transmitting item data to Google using the Google Content API
- Development of a modular and maintainable system architecture based on Domain-Driven Design (DDD) principles
- Design and management of relational MySQL databases for efficient storage and querying of warehouse and accounting data
- Implementation of business logic with Java, Spring Boot, and REST APIs for secure and high-performance communication with frontend components
- Optimization of accounting and warehouse processes through the development and implementation of an automated system for data collection, processing, and integration into a backend system with efficient data processing
- Implementation of security measures such as SSL/TLS encryption, access controls, and Spring Security to ensure data integrity
- Creation of a REST API for real-time inventory tracking and automation of ordering processes
- Integration of external partners via an AS2 messaging system and a PHP-/Laravel-based communication system for secure and efficient data exchange and the automation of business processes
- Synchronization and monitoring of data through API calls in Linux Cron Jobs to ensure its consistency and up-to-date status
- Design and implementation of frontend components with Vue.js, JavaScript, HTML, CSS, and Tailwind CSS for an intuitive and responsive user interface
- Execution of unit, integration, and end-to-end tests with JUnit, Mockito, and Cypress to ensure the functionality, reliability, and integration of the system
- Ensuring API security and performance with Postman and JMeter for API testing, performance analysis, and troubleshooting
- Setup of a CI/CD pipeline with GitLab CI for continuous integration, automated testing, and reliable deployments
- Use of Git and GitLab to manage source code, including branching, merging, and change tracking
- Use of Artifactory to manage artifacts and dependencies and provide scalable storage solutions for build packages
- Conducting regular code reviews to ensure code quality, promote best practices, and comply with architecture and security standards
- Development of Python scripts to automate recurring tasks such as data synchronization and system monitoring
- Application of advanced analysis methods (e.g., cluster, regression, time series, and correlation analyses) to optimize business processes, identify sales trends, and enable data-driven decisions
- Agile development according to Scrum and Kanban, including pair programming to promote code quality and team collaboration
Tech-Stack: Java 17, Spring Boot 2, REST-APIs, JavaScript, Vue.js, Tailwind CSS, HTML, CSS, Spring Security, JUnit, Mockito, Cypress, Postman, Git, GitLab, GitLab CI, MySQL, Linux, PHP, Laravel, Python, R, SSL/TLS, JMeter, Artifactory, Google Content API, AS2-Messaging, Jira, Confluence
Methods: Scrum, Kanban, CI/CD, Code Reviews, Domain-Driven Design (DDD), Pair Programming
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Education, Information Technology, Professional Services, Tourism, and Energy.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Business Intelligence, Research and Development, and Product Development.
Summary
- 16 years in IT - Senior Software Developer, Full-Stack Developer, DevOps Engineer and Linux Administrator
Skills
Personal Interests:
Distributed Tracing, Circuit Breaking And Fault Tolerance For The Resilience And Scalability Of Complex Systems
Use Of Advanced Kubernetes Features Such As Statefulsets, Operators And Helm Charts To Operate Large Distributed Systems
Backend: Java, Spring Boot, Spring Data Jpa, Jpa/Hibernate, Spring Web, Java Ee, Node.Js, Python, Php, Laravel, Lombok, Spring Initializr, C++, Spin-Framework
Frontend: Javascript, Typescript, Html5, Css3, React, Angular, Vue.Js, Tailwind Css, Svelte
Databases: Mysql, Postgresql, Amazon Rds, Redis, Amazon Dynamodb, Mariadb, Microsoft Sql Server, Sqlite, H2
Web Services: Rest Apis, Graphql, Google Content Api, Soap
Cloud: Aws (Ec2, S3, Lambda, Iam, Ecs/Ecs Anywhere, Cloudwatch, Direct Connect, Organizations, Systems Manager), Azure, Google Cloud, Amazon (Api Gateway, Sqs/Sns, Kinesis Data Firehose, Athena, Quicksight, Cloudtrail)
Software Architecture: Microservices
Containerization: Docker
Orchestration: Kubernetes, Helm, Openshift, Kustomize
Security: Spring Security, Jwt, Ssl/Tls
Ci/Cd: Gitlab Ci, Jenkins
Version Control: Git, Github, Gitlab, Bitbucket
Build Management: Maven
Package Manager: Npm
Testing: Junit, Mockito, Spring Boot Test, Postman, Cypress, Jest, Jmeter
Operating Systems: Linux (Ubuntu, Centos, Debian), Windows
Monitoring And Logging: Prometheus, Grafana, Nagios, Icinga
Log Analysis: Elasticsearch, Logstash, Kibana
Networking: Tcp/Ip, Dhcp, Vpn, Ns
Ide: Intellij Idea
Scripting: Bash, Shell
Web Server: Nginx
Repository Manager: Artifactory
Collaboration: Jira, Confluence
Other: Active Directory, Istio, Vmware, Exchange Server, Jaspersoft, R, As2-Messaging, Data.Sql, Matrix Synapse, Abas Erp System
Methods: Scrum, Kanban, Safe, Waterfall, Domain-Driven Design (Ddd), Test-Driven Development (Tdd), Code Review, Pair Programming, Devops
Design And Implementation Of Microservices Architectures, Serverless Infrastructures And Scalable Monitoring Solutions For Highly Available Applications
Creation Of Intuitive User Interfaces With Angular, Vue.Js, And React As Well As Integration Of High-Performance Backends With Java, Spring Boot And Rest Apis
Automation, Scaling And Orchestration Of Distributed Systems With Aws, Kubernetes And Docker As Well As Setup Of Ci/Cd Pipelines With Jenkins And Gitlab Ci
Design And Management Of Databases Such As Postgresql And Mysql As Well As Analysis Of Financial And Business Processes Using Statistical Methods
Implementation Of Modern Security Standards Such As Spring Security And Ssl/Tls, With Monitoring Using Tools Such As Prometheus, Grafana, Elasticsearch And Kibana
Management And Implementation Of Projects In Agile Environments Using Modern Development Practices Such As Pair Programming, Tdd And Ddd
Languages
Education
Universität Leipzig
Dr. rer. nat. · Leipzig, Germany · Magna Cum Laude
Technische Universität Chemnitz
Bachelor und Master of Science, Angewandte Mathematik · Mathematics · Chemnitz, Germany
Tribhuwan University
allgemeine Hochschulreife · Nepal
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Nab is based in Wiesbaden, Germany.
Nab speaks the following languages: Nepali (Native), German (Advanced), English (Advanced).
Nab has at least 19 years of experience. During this time, Nab has worked in at least 6 different roles and for 7 different companies. The average length of individual experience is 3 years and 8 months. Note that Nab may not have shared all experience and actually has more experience.
Based on recent experience, Nab would be well-suited for roles such as: Freelance Senior IT Consultant, Freelance Senior Linux and DevOps Specialist, Full-Stack Developer.
Nab's most recent position is Freelance Senior IT Consultant at FourEnergy GmbH.
In recent years, Nab has worked for FourEnergy GmbH, HR Solutions GmbH, G.i.N. GmbH, Nextrend GmbH, and ALGI Alfred Giehl GmbH&Co.KG.
Nab is most experienced in industries like Education, Information Technology, and Tourism. Nab also has some experience in Professional Services and Energy.
Nab is most experienced in business areas like Information Technology, Business Intelligence, and Research and Development. Nab also has some experience in Product Development.
Nab has recently worked in industries like Information Technology, Professional Services, and Energy.
Nab has recently worked in business areas like Information Technology and Product Development.
Nab holds a Doctorate from Universität Leipzig and a Master in Mathematics from Technische Universität Chemnitz.
Nab is immediately available for suitable projects.
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Average rates for similar positions
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The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 5 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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