Alexander Kapincev-Senior Fullstack Developer
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Experience
Senior Fullstack Developer
Deutsche Vermögensberatung AG (DVAG)
- Further development and maintenance of a complex sales platform with a focus on digital closing processes, customer portal interactions, and document generation for financial and insurance products
- Development and maintenance of microservices with Spring Boot 3 and Kotlin
- Frontend development with Angular 20 for displaying products, applications, and documents
- Execution of end-to-end tests with Playwright and integration tests with WireMock
- Creation and optimization of Quartz jobs and CronJobs
- Refactoring of the security configuration in a multi-realm Keycloak setup with a custom filter chain, permission evaluator, and factory routing
- Creation of dynamic emails with Thymeleaf
- Extensive error analysis with Application Insights, Log Analytics, and direct SQL debugging
- Introduction of a dynamically controlled security architecture with flexible token handling depending on path and realm
- Stabilization and clear structuring of the closing process for complex product models
- Significantly improved maintainability and readability of the code through modular refactorings
- Higher test stability and depth through combined use of Playwright, WireMock, and integration tests
- Targeted performance optimization through analysis of Hibernate statistics, query tuning, and use of SQL execution plans
- Technologies used: Java 21, Kotlin, Spring Boot 3, Angular, TypeScript, REST API, JSON, Kubernetes, Docker, PostgreSQL, Liquibase, Keycloak, OAuth2, GitHub Actions, Testcontainers, Azure Application Insights, Thymeleaf, Tilt, Microsoft SQL Server
Senior Fullstack Developer
Fraunhofer-Institut für Experimentelles Software Engineering IESE
- Development of a digital platform in the BMEL-funded project "Smarte.Land.Regionen" to support digitalization in rural areas
- Implementation of microservices with Spring Boot 2/3 and Java 19
- Extensive frontend development with React, including the creation and extension of many components
- Integration of a payment provider (Secupay) and full automation of payment processing
- Migration of existing systems to newer versions and restructuring of the database schema using Liquibase
- Creation and implementation of user stories
- Significant improvement of the user interface and user experience through tailored React components
- Successful migration from Spring Boot 2 to 3 and increased test coverage with Testcontainers
- Contribution to better platform efficiency and user satisfaction
- Technologies used: Java 19, Spring Boot 2/3, React, TypeScript, JavaScript, REST API, JSON, Kubernetes, Docker, PostgreSQL, Liquibase, Keycloak, GitLab CI, Testcontainers, GreenMail, Thymeleaf
Senior Fullstack Developer
Techem X GmbH
- Revolutionized the private customer business through fully digital solutions for heating cost billing and smoke alarm management
- Design and development of cloud-native backend systems on the Azure platform
- Implementation of microservices with Spring Boot 3 and Java 17/19
- Integration of various third-party systems (Heiztec, Ortec, SAP, Microsoft Calendar, CRM)
- Development of GraphQL interfaces and Kubernetes configurations
- Design and implementation of complex business logic for billing and device management processes
- Implementation of Azure Functions
- Contribution to frontend development with React
- Successful digitalization and automation of the customer acquisition process
- Migration of the entire system to Kubernetes for better scalability and maintainability
- Technologies used: Java 17/19, Spring Boot 2/3, Azure Cloud, Terraform, Docker, Kubernetes, Helm, Grafana, PostgreSQL, Cosmos DB, MS SQL, Drools (BRMS), GraphQL, React, GitLab CI, Testcontainers, SOAP, XML, WSDL, REST API, Application Insights
Senior Fullstack Developer
DG Verlag / DGNexolution
- Further development of an E-Accounting tool for Volksbanken and Raiffeisenbanken for online generation and processing of electronic invoice data
- Development of an MVP for a sustainability portal to support sustainable businesses
- Implementation of new features and requirements in the E-Accounting tool and introduction of a new invoice data format for Atruvia
- Backend development with Spring Boot 2 and Java 11/Kotlin, frontend development with Angular 13
- Development of Magnolia CMS apps, REST endpoints, and light modules
- Integration of Hibernate Search and Lucene as well as implementation of security measures with Spring ACL
- Database design and optimization with PostgreSQL and Ltree
- Successful introduction of the new invoice data format and production launch of the MVP
- Technologies used: Java 11, Kotlin, Spring Boot 2, TypeScript, Angular 13, Docker, Kubernetes, Spring ACL, PostgreSQL, Hibernate Search, Lucene, Magnolia, REST API, JSON
Fullstack Developer
DB Regio Bus
- Further development of a cloud-based data lake and integration platform for digital transformation
- Analysis and assessment of data quality as well as transformations for data cleansing
- Design and implementation of a Java-based microservice for CSV and XML processing
- Adaptation and optimization of existing Python and Groovy modules
- Development of a Groovy script to automate user import into the Tenfold system
- Integration of security measures with Keycloak and containerization with Docker
- Successful implementation and production rollout of the Java microservice and automation of user import
- Technologies used: Java 8, Spring Boot 2, Python, Groovy, JavaScript, Linux Shell, Keycloak, Docker, Tenfold, SOAP, REST API, XML, JSON
Fullstack Developer
Unzer GmbH
- Modernization and automation of data import processes for the standard debtor management and billing system
- Design and architecture of the software for the new import solution
- Development of microservices with Java and Spring Boot 2, as well as implementation of complex business logic
- Setup and optimization of CI/CD pipelines with GitLab CI and Jenkins
- Integration of Keycloak via OpenID Connect and message queue-based communication with ActiveMQ and Kafka
- Automation of merchant data imports and deployment to the AWS cloud
- Significant reduction of manual work and improvement of scalability and data security
- Technologies used: Java 11, Spring Boot 2, Spring Cloud Config, AWS (SQS, SNS, DynamoDB), MariaDB, ActiveMQ, Apache Kafka, Maven, Keycloak, OAuth2, Testcontainers, Docker, Kubernetes, GitLab CI, Jenkins, REST API, JSON
Fullstack Developer
Unzer GmbH
- Development of the Merchant Onboarding Service Hub (MOSH) to automate the merchant onboarding process
- Backend development with Java and Spring Boot 2, frontend with Angular 8 and Bootstrap 4
- Implementation of complex business logic and modeling with Flowable
- Integration of Keycloak via OpenID Connect
- Setup and optimization of CI/CD pipelines
- Development and integration of AWS services (DynamoDB, SQS, SNS, S3)
- MVP launch in September 2020 for self-onboarding capability and continuous expansion of the processes
- Technologies used: Java 8, Spring Boot 2, Angular 8, Bootstrap 4, AWS (DynamoDB, SQS, SNS, S3), Elastic Beanstalk, Flowable, Keycloak, Docker, Kubernetes, Testcontainers, GitLab, Jenkins, SonarQube, Postman, REST API, JSON
Fullstack Developer
Detim Consulting GmbH
- Further development of a web application for managing employee data
- Backend development with Java and Spring Boot 2, implementation of complex business logic
- Development and optimization of RESTful APIs
- Frontend development with Angular 6 and responsive user interfaces with HTML and SCSS
- Integration of Keycloak via OAuth 2.0 and database optimization with Hibernate
- Continuous integration and version control with Git and BitBucket
- Improved UI, efficient backend services, and increased security
- Technologies used: Java 8, Spring Boot 2, Angular 6, Hibernate, Maven, HTML, SCSS, Keycloak, OAuth 2.0, Git, BitBucket, REST API, JSON
Fullstack Developer
Deutsche Telekom
- Further development and customization of the cBSI platform for automated business process integration in the Customer Care & Billing area
- Backend development with Java 7, Java EE, and implementation of business logic
- Development and extension of web services, JavaServer Faces, and ICEfaces frontend
- Adaptation and migration of C++ adapters to Java
- Development of shell scripts for automatic processing of CSV files
- Support during commissioning and deployment of new features
- Successful migration of C++ adapters, extension of platform functionality, and improved integration
- Technologies used: Java 7, Java EE, C++, JBoss, Hibernate, Oracle DB, JavaServer Faces, ICEfaces, HTML, CSS, JavaScript, Linux Shell, SED, Subversion, SOAP, XML, JSON, REST API
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Banking and Finance, Insurance, Information Technology, Energy, and Telecommunication.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Research and Development, Accounting, and Customer Service.
Summary
As an experienced Fullstack Developer and Cloud Engineer, I bring a broad range of experience and skills in building distributed systems and cloud applications. My long-standing expertise includes developing microservices with Java and Spring Boot, as well as integrating cloud technologies like AWS and Azure.
My knowledge covers the whole Java ecosystem, modern web development with Angular and React, as well as DevOps practices with Docker and Kubernetes. I have extensive experience in CI/CD, database design (relational and NoSQL), security implementations, and messaging systems.
Skills
Java Ecosystem: Java 8-24, Kotlin, Spring Boot 2+, Spring (Data, Cloud, Mvc, Security), Jpa/Hibernate
Web Development: Angular, React, Typescript, Javascript, Html5, Css
Cloud & Devops: Aws, Azure, Docker, Kubernetes, Helm, Terraform
Ci/Cd: Gitlab Ci, Github Actions, Jenkins, Maven, Gradle, Git
Agile Methods: Experience In Scrum/Kanban Projects
Architecture And Planning: Knowledge In Architecture, Planning, Implementation, And Quality Assurance Of Complex Software Solutions.
Databases: Design And Setup Of Relational And Nosql Databases (Postgresql, Mysql, Mariadb, Oracledb, Dynamodb, Mongodb, Cosmosdb)
Programming Languages: Java 8-24, Typescript, Javascript, Kotlin, Python
Web And Frontend Development: Angular 2+, React, Html 5, Bootstrap 4+, Css, Scss, Sass, Nodejs, Npm, Free Marker / Thymeleaf
Backend Development: Spring Boot 2+, Spring Data, Spring Cloud, Spring Security, Spring Acl, Jpa / Hibernate, Liquibase, Apache Pdfbox, Quartz
Devops: Docker, Terraform, Kubernetes (Helm, Kustomize), Linux Shell, Grafana, Prometheus, Tilt
Ci/Cd: Gitlab Ci, Github Actions, Jenkins, Maven, Gradle, Git
Databases: Mysql, Mariadb, Oracle Db, Postgresql/Postgis, Dynamodb, Mongodb, Cosmos Db, Azure Sql
Cloud Computing: Aws (S3, Cloudfront, Ecs, Ec2, Eb, Rds, Lambda), Azure (Azure Functions, Cosmos Db, Azure Blob Storage, Application Insights, Aks, Workbooks, Key Vault)
Security: Keycloak, Azure Ad, Json Web Token, Oauth 2.0, Openid Connect, Spring Acl
Communication: Rest Api, Graphql, Soap, Websocket, Activemq, Aws Sns/Sqs, Azure Service Bus, Azure Eventgrids, Kafka
Search Engine: Hibernatesearch, Lucene
Test / Quality Management: Junit 5, Mockito, Wiremock, Playwright, Selenide, Selenium, Sonarqube, Openapi/Swagger, Testcontainers
Tools / Standard Software: Intellij Idea, Atlassian Jira, Confluence, Openlens, Plantuml, Postman
Languages
Education
Hochschule Darmstadt
M.Sc. Computer Science · Computer Science · Darmstadt, Germany
Hochschule Darmstadt
B.Sc. Computer Science · Computer Science · Darmstadt, Germany
Certifications & licenses
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Alexander is based in Darmstadt, Germany and prefers 100% remote projects.
Alexander speaks the following languages: German (Native), English (Advanced).
Alexander has at least 9 years of experience. During this time, Alexander has worked in at least 2 different roles and for 8 different companies. The average length of individual experience is 1 year and 11 months. Note that Alexander may not have shared all experience and actually has more experience.
Based on recent experience, Alexander would be well-suited for roles such as: Senior Fullstack Developer, Fullstack Developer.
Alexander's most recent position is Senior Fullstack Developer at Deutsche Vermögensberatung AG (DVAG).
In recent years, Alexander has worked for Deutsche Vermögensberatung AG (DVAG), Fraunhofer-Institut für Experimentelles Software Engineering IESE, Techem X GmbH, and DG Verlag / DGNexolution.
Alexander is most experienced in industries like Banking and Finance, Information Technology, and Insurance. Alexander also has some experience in Energy, Telecommunication, and Transportation.
Alexander is most experienced in business areas like Information Technology, Product Development, and Accounting. Alexander also has some experience in Research and Development and Customer Service.
Alexander has recently worked in industries like Banking and Finance, Insurance, and Information Technology.
Alexander has recently worked in business areas like Information Technology, Product Development, and Accounting.
Alexander holds a Master in Computer Science from Hochschule Darmstadt and a Bachelor in Computer Science from Hochschule Darmstadt.
Alexander has 2 certificates. These include: Certified Kubernetes Application Developer and Terraform Certified Associate HOTAO-003.
The availability of Alexander needs to be confirmed.
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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 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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