Kaarel Kaareste - Senior Full-Stack & DevOps Engineer

Q: Where is Kaarel based?

Kaarel is based in Kose, Estonia .

Q: What languages does Kaarel speak?

Kaarel speaks the following languages: Estonian (Native), English (Advanced) .

Q: How many years of experience does Kaarel have?

Kaarel has at least 13 years of experience. During this time, Kaarel has worked in at least 3 different roles and for 4 different companies . The average length of individual experience is 3 years and 3 months . Note that Kaarel may not have shared all experience and actually has more experience.

Q: What is Kaarel's latest experience?

Kaarel's most recent position is Senior Full-Stack & DevOps Engineer at Vetasi, a Cohesive company .

Q: What companies has Kaarel worked for in recent years?

In recent years, Kaarel has worked for Vetasi, a Cohesive company and TNG Technology Consulting .

Q: Which industries is Kaarel most experienced in?

Kaarel is most experienced in industries like Information Technology , Banking and Finance , and Transportation .

Q: Which business areas is Kaarel most experienced in?

Kaarel is most experienced in business areas like Information Technology , Quality Assurance , and Product Development .

Q: Which industries has Kaarel worked in recently?

Kaarel has recently worked in industries like Information Technology .

Q: Which business areas has Kaarel worked in recently?

Kaarel has recently worked in business areas like Information Technology , Quality Assurance , and Product Development .

Recommended expert

Kose, Estonia

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Experience

Aug 2022 - Present

3 years 10 months

United Kingdom

Senior Full-Stack & DevOps Engineer

Vetasi, a Cohesive company

Developed JVM-centric evaluation tools enabling precise code generation assessment for LLM training pipelines across large distributed test suites.
Implemented Spring Boot microservices to benchmark agent-based code execution improving model reasoning accuracy through structured runtime data.
Created complex prompt evaluation scenarios using Java 17 concurrency to stress test model behaviour and expand multi-domain training coverage.
Built automated JUnit 5 and TestContainers frameworks to validate sandboxed environments boosting evaluation throughput for experimental projects.
Optimized JVM performance with profiling tools to expose edge-case runtime failures allowing consistent and stable LLM fine-tuning cycles.
Collaborated with solution engineers to adapt guidelines and model rubrics enabling accurate annotation workflows across evolving code domains.

Sep 2018 - Jul 2022

3 years 11 months

Germany

Senior Software Engineer

TNG Technology Consulting

Engineered scalable Java microservices powering Maximo extensions and integrations which improved operational automation for enterprise clients.
Modernized CI/CD with GitHub Actions and Terraform modules enabling reliable multi-environment deployments for distributed field systems.
Enhanced JVM performance with profiling and tuning strategies that reduced service latency while supporting complex asset-management flows.
Implemented Kafka event pipelines to synchronize telemetry and workflow updates ensuring resilient and observable service interactions.
Developed secure APIs with Spring Security and OAuth2 strengthening access control for high-compliance enterprise environments.
Introduced automated testing with JUnit 5 and Mockito increasing defect detection and stability across cloud-hosted workloads.
Guided engineers in cloud-native patterns enabling consistent application of DevOps and microservice best practices across teams.

Nov 2015 - Aug 2018

2 years 10 months

Czech Republic

Senior Software Engineer

Spinoco

Built distributed Java services for fintech analytics that improved transaction throughput while enabling reliable event-driven processing.
Optimized MySQL and ElasticSearch integrations supporting scalable reporting workloads for large European enterprise customers.
Implemented CI/CD pipelines and containerization workflows enabling faster delivery cycles and predictable release quality.
Enhanced concurrency handling and JVM tuning which stabilized high-load services used in real-time communication workflows.
Collaborated across backend and frontend teams to deliver full-stack features reinforcing product usability and operational efficiency.

Jul 2013 - Oct 2015

2 years 4 months

Estonia

Full Stack Developer

A.S.O. Group

Developed Java and JavaScript backend modules that supported logistics automation improving data handling for regional operations.
Delivered REST APIs and microservice components enabling cleaner system integrations for expanding partner ecosystems.
Built SQL-driven data flows and caching solutions enhancing reliability of core transactional processes for internal users.
Containerized workloads and improved deployment pipelines supporting early cloud adoption and operational consistency.
Implemented automated tests and profiling routines ensuring better system stability during rapid product iterations.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Banking and Finance, and Transportation.

Information Technology

Banking and Finance

Transportation

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Quality Assurance, and Product Development.

Information Technology

Quality Assurance

Product Development

Summary

Senior software engineer with 12+ years in Java, microservices and cloud-native systems delivering scalable platforms and AI-assisted tooling across global products, combining deep JVM expertise with strong DevOps, test automation and LLM-focused engineering to support complex training, evaluation and model-quality pipelines.

Skills

Java 17+
Spring Boot
Spring Data
Spring Security
Jpa
Hibernate
Maven
Gradle
Github Actions
Gitlab Ci
Jenkins
Intellij Idea
Jvm Internals
Garbage Collection
Concurrency
Streams Api
Testng
Junit 5
Mockito
Testcontainers
Kafka
Rabbitmq
Microservices
Rest Apis
Graphql
Docker
Kubernetes
Aws
Azure
Terraform
Helm
Ci/Cd
Observability
Prometheus
Grafana
Design Patterns
Clean Architecture
Ddd
Event-Driven Systems
Postgres
Mysql
Redis
Elasticsearch
Profiling
Jprofiler
Visualvm
Debugging
Code Review
Ai-Assisted Development
Prompt Engineering
Llm Evaluation
Benchmarking
Grpc
Oauth2
Devops Automation
Cloud Networking

Languages

Estonian

Native

English

Advanced

Education

Sep 2009 - Jun 2013

Tallinn University of Technology

Bachelor’s degree, Computer Science · Computer Science · Tallinn, Estonia

Statistics

Experience

Total positions 4

Experience in Information Technology 10.5 y

Avg length 3 y 2 m

Longest experience 3 y 10 m

Global Experience

Countries worked in 4 (United Kingdom, Germany, Czech Republic, Estonia)

Primary country United Kingdom

Expertise

Recent roles Senior Full-Stack & DevOps Engineer, Senior Software Engineer, Full Stack Developer

Main industries Information Technology, Banking and Finance, Transportation

Main business areas Information Technology, Quality Assurance, Product Development

Qualifications

Highest degree Bachelor

Profile

Created

December 2025

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Frequently asked questions

Have questions? Find more information here.

Where is Kaarel based?

Kaarel is based in Kose, Estonia.

What languages does Kaarel speak?

Kaarel speaks the following languages: Estonian (Native), English (Advanced).

How many years of experience does Kaarel have?

Kaarel has at least 13 years of experience. During this time, Kaarel has worked in at least 3 different roles and for 4 different companies. The average length of individual experience is 3 years and 3 months. Note that Kaarel may not have shared all experience and actually has more experience.

What roles would Kaarel be best suited for?

Based on recent experience, Kaarel would be well-suited for roles such as: Senior Full-Stack & DevOps Engineer, Senior Software Engineer, Full Stack Developer.

What is Kaarel's latest experience?

Kaarel's most recent position is Senior Full-Stack & DevOps Engineer at Vetasi, a Cohesive company.

What companies has Kaarel worked for in recent years?

In recent years, Kaarel has worked for Vetasi, a Cohesive company and TNG Technology Consulting.

Which industries is Kaarel most experienced in?

Kaarel is most experienced in industries like Information Technology, Banking and Finance, and Transportation.

Which business areas is Kaarel most experienced in?

Kaarel is most experienced in business areas like Information Technology, Quality Assurance, and Product Development.

Which industries has Kaarel worked in recently?

Kaarel has recently worked in industries like Information Technology.

Which business areas has Kaarel worked in recently?

Kaarel has recently worked in business areas like Information Technology, Quality Assurance, and Product Development.

What is Kaarel's education?

Kaarel holds a Bachelor in Computer Science from Tallinn University of Technology.

What is the availability of Kaarel?

Kaarel is immediately available full-time for suitable projects.

What is the rate of Kaarel?

Kaarel's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.