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I'm a versatile backend and full-stack software engineer with a solid foundation in backend development, cloud infrastructure, and frontend work with React. I design and implement scalable services and automation on AWS using Kotlin + Spring, PostgreSQL and Redis, and I enjoy turning complex requirements into reliable, maintainable software. I work well in cross-functional teams, mentor junior developers, and implement observability, DDD, and TDD standards. I liaise with clients to tailor solutions to industrial needs and deliver iterative improvements while keeping quality and delivery speed in mind.…I'm a versatile backend and full-stack software engineer with a solid foundation in backend development, cloud infrastructure, and frontend work with React. I design and implement scalable services and automation on AWS using Kotlin + Spring, PostgreSQL and Redis, and I enjoy turning complex requirements into reliable, maintainable software. I work well in cross-functional teams, mentor junior developers, and implement observability, DDD, and TDD standards. I liaise with clients to tailor solutions to industrial needs and deliver iterative improvements while keeping quality and delivery speed in mind.

Alexander Leontjev

Full Stack Developer, Back-End Developer, Web Developer, +2

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I'm a versatile backend and full-stack software engineer with a solid foundation in backend development, cloud infrastructure, and frontend work with React. I design and implement scalable services and automation on AWS using Kotlin + Spring, PostgreSQL and Redis, and I enjoy turning complex requirements into reliable, maintainable software. I work well in cross-functional teams, mentor junior developers, and implement observability, DDD, and TDD standards. I liaise with clients to tailor solutions to industrial needs and deliver iterative improvements while keeping quality and delivery speed in mind.…I'm a versatile backend and full-stack software engineer with a solid foundation in backend development, cloud infrastructure, and frontend work with React. I design and implement scalable services and automation on AWS using Kotlin + Spring, PostgreSQL and Redis, and I enjoy turning complex requirements into reliable, maintainable software. I work well in cross-functional teams, mentor junior developers, and implement observability, DDD, and TDD standards. I liaise with clients to tailor solutions to industrial needs and deliver iterative improvements while keeping quality and delivery speed in mind.

Available to hire

I’m a versatile backend and full-stack software engineer with a solid foundation in backend development, cloud infrastructure, and frontend work with React. I design and implement scalable services and automation on AWS using Kotlin + Spring, PostgreSQL and Redis, and I enjoy turning complex requirements into reliable, maintainable software.

I work well in cross-functional teams, mentor junior developers, and implement observability, DDD, and TDD standards. I liaise with clients to tailor solutions to industrial needs and deliver iterative improvements while keeping quality and delivery speed in mind.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Advanced

German

Intermediate

Work Experience

Software Engineer at Ideal Online Internet GmbH

July 1, 2024 - October 21, 2025

Developed backend systems in PHP (Laravel, Symfony) with MySQL, MongoDB, Kafka and Java (Spring Boot). Led DevOps and infrastructure on AWS, Kubernetes, GitHub Actions, Terraform. Key achievements include leading event-driven backend services for internal and external integrations handling millions of domain events and thousands of daily transactions; optimizing performance by refactoring microservices and queries; defining and enforcing engineering standards (DDD, TDD, microservices, layered architecture); authoring technical docs; leading cloud migration and CI/CD projects; mentoring junior developers; implementing observability to improve incident response times and service quality.

Freelance Full-Stack Software Engineer at Self-employed / Freelancer

July 1, 2024 - Present

Designed and implemented automation and monitoring services using Kotlin with Spring and PostgreSQL. Built responsive and user-friendly web and mobile apps with React and React Native. Deployed and maintained scalable cloud infrastructure on AWS. Liaised directly with clients to understand industrial requirements and delivered tailored software solutions.

Junior PHP Developer at Pyrexx GmbH

April 1, 2022 - October 21, 2025

Developed and maintained enterprise CRM, logistics, and scheduling applications; refactored legacy code to reduce technical debt; optimized DB queries; implemented GraphQL APIs; collaborated with UX teams to design frontend components.

Technical Content Manager - Digital Marketing at ctrl QS

February 1, 2019 - October 21, 2025

Managed technical content for international e-commerce systems; Administered and configured TYPO3 CMS using PHP, JavaScript, CSS and HTML; Maintained admin stack with Jira, Confluence, Bitbucket, Sitecore, Adobe; Supported digital marketing campaigns and cross-functional teams.