Alexander Reelsen

Software Engineer

Emsdetten, North Rhine-Westphalia, Germany18 yrs 3 mos experience

Key Highlights

15+ years of experience in distributed search engines.
Expertise in Elasticsearch development and training.
Strong focus on scalability and web architectures.

Stackforce AI infers this person is a SaaS expert with a strong focus on search technologies and scalability.

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Skills

Core Skills

ElasticsearchSoftware DevelopmentJavaSoftware EngineeringWeb Services

Other Skills

GroovyMongoDBHibernateSpringAxis1JAXBJavaScriptOpen SourceLinuxlogstashkibanaConcurrencyScrumScalabilityGeb

About

Software Engineer with focus on simplicity and concurrency in the java world. Also interested in scaling web architectures and its technologies. Being RESTful and always considering open source. Current focus is on information retrieval and all things scale, search & analytics, using and developing elasticsearch.

Experience

18 yrs 3 mos

Total Experience

2 yrs 11 mos

Average Tenure

6 mos

Current Experience

Elastic

Software Engineer

Nov 2025 – Present · 6 mos · Remote

Kaufland e-commerce

Principal Engineer

Jan 2024 – Oct 2025 · 1 yr 9 mos · Remote

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Firebolt

Developer Advocate

Jan 2022 – Jan 2023 · 1 yr

Elastic

2 roles

Community Advocate/DevRel (Developer Relations)

Jan 2019 – Jan 2022 · 3 yrs

Software Engineer

Jan 2013 – Jan 2019 · 6 yrs

Developing Elasticsearch, its commercial extension x-pack (including security and alerting), giving trainings, supporting customers, attending conferences, staffing booths, writing blog posts, giving presentations and workshops all over Europe

Lusini gmbh

Software Engineer

Jan 2010 – Jan 2013 · 3 yrs · Greater Munich Metropolitan Area

Building an ecommerce b2b marketplace using technologies/languages like Java, Groovy, Play Framework, Elasticsearch, MongoDB, NodeJS, Apache OFBiz, Jackson.

Comnos gmbh

Software Engineer

Jan 2008 – Jan 2010 · 2 yrs

Software Engineering of a java based campaign management system with focus on maintenance, concurrency, web services and web development using technologies like hibernate, spring, struts, axis2, alfresco, dojo.