Matas Kazlauskas - Senior Full Stack Engineer

Q: Where is Matas based?

Matas is based in Visaginas, Lithuania .

Q: What languages does Matas speak?

Matas speaks the following languages: English (Advanced), Lithuanian (Advanced), Czech (Elementary), German (Elementary) .

Q: How many years of experience does Matas have?

Matas has at least 9 years of experience. During this time, Matas has worked in at least 4 different roles and for 4 different companies . The average length of individual experience is 2 years and 2 months . Note that Matas may not have shared all experience and actually has more experience.

Q: What is Matas's latest experience?

Matas's most recent position is Senior Full Stack Engineer at Farmy .

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

In recent years, Matas has worked for Farmy and Mews .

Q: Which industries is Matas most experienced in?

Matas is most experienced in industries like Tourism and Hospitality , Healthcare , and Banking and Finance . Matas also has some experience in Information Technology (IT) , Transportation and Logistics , and Agriculture .

Q: Which business areas is Matas most experienced in?

Matas is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Q: Which industries has Matas worked in recently?

Matas has recently worked in industries like Tourism and Hospitality , Agriculture , and Food and Beverage .

Q: Which business areas has Matas worked in recently?

Matas has recently worked in business areas like Information Technology (IT) and Product Development .

Recommended expert

Visaginas, Lithuania

Experience

Sep 2024 - Present

1 year 6 months

Zürich, Switzerland

Senior Full Stack Engineer

Farmy

Architected and implemented Java Spring Boot microservices for order management and inventory synchronization, reducing stock-out incidents by 20% through event-driven Kafka pipelines.
Built React frontends with Hooks and Redux Toolkit, improving UI responsiveness for 50k+ monthly active users.
Introduced AI-driven dynamic pricing engine (Python ML services integrated with Java APIs), increasing gross margin by 8%.
Migrated critical modules to AWS EKS + Terraform, ensuring scalability during peak demand and achieving 99.95% uptime.
Implemented CI/CD pipelines with GitHub Actions and Docker, cutting release cycles from 2 weeks to 3 days.
Designed GraphQL APIs for mobile app integrations, supporting customer and vendor-facing applications.
Applied hexagonal architecture principles to decouple domain logic from infrastructure, improving testability and maintainability.
Enhanced caching strategies with Redis and database optimization in PostgreSQL, reducing checkout API latency by 30%.
Developed blockchain prototype for farm-to-table traceability, enabling transparent product origin tracking.
Mentored junior engineers on Java microservices, React optimization, and cloud-native best practices, improving team delivery velocity by 15%

Nov 2020 - Sep 2023

2 years 11 months

Prague, Czech Republic

Full Stack Engineer

Mews

Developed Java Spring Boot reservation and billing services, processing 1M+ monthly transactions across hotels and hostels.
Built React dashboards for hospitality managers with real-time booking visualization, improving operational decision-making speed.
Integrated AI-powered demand forecasting models into the booking pipeline, reducing overbooking incidents by 12%.
Migrated monolith modules to Kubernetes-based microservices with CI/CD automation, increasing release frequency by 40%.
Designed and exposed REST/GraphQL APIs to third-party booking providers, enabling faster onboarding of B2B integrations.
Improved payment flow by implementing blockchain-based smart contracts for secure deposits, reducing disputes.
Applied CQRS and event sourcing patterns for financial transactions, improving auditability and system reliability.
Automated testing (JUnit, Jest, Cypress) and monitoring (Datadog, ELK Stack), reducing production issues by 25%.
Refactored legacy AngularJS modules to React with TypeScript, cutting frontend technical debt.
Mentored cross-functional teams on clean architecture and API-first design, improving collaboration across frontend, backend, and DevOps.

Feb 2018 - Oct 2020

2 years 9 months

Kaunas, Lithuania

Full Stack Developer

Sanitas

Built Java Spring Boot APIs for patient records and prescription tracking, ensuring compliance with healthcare data regulations.
Designed Angular dashboards for doctors and pharmacists, enabling real-time access to medical histories.
Integrated AI-based symptom checker module (Python NLP with Java APIs), reducing unnecessary clinic visits by 10%.
Deployed services to Azure Kubernetes Service (AKS), improving scalability for regional hospital networks.
Developed blockchain-based prototype for prescription authenticity validation, reducing fraud risk.
Implemented CI/CD pipelines with Jenkins and Docker, reducing deployment errors by 35%.
Optimized Hibernate queries and applied Redis caching, improving patient data retrieval by 25%.
Collaborated with mobile team to design backend APIs for Android/iOS apps, ensuring consistent data access.
Conducted unit and integration testing with JUnit, Mockito, and Selenium, raising automated coverage to 85%.
Applied DDD (Domain-Driven Design) for healthcare modules, simplifying future enhancements and integrations.

Jul 2016 - Feb 2018

1 year 8 months

Kaunas, Lithuania

Web Developer

TeleSoftas

Developed Java-based backend modules and AngularJS/React frontends for client-facing projects across finance and logistics.
Implemented microservices for invoice management using Spring Boot and REST APIs, streamlining processing for enterprise clients.
Built React dashboards with Redux for delivery tracking systems, improving user satisfaction scores by 15%.
Assisted in deploying applications to AWS (EC2, RDS, S3) with Docker-based workflows, ensuring 99% uptime.
Introduced AI-driven OCR module for document scanning and invoice recognition, reducing manual data entry by 30%.
Implemented CI/CD pipelines with Jenkins, enabling continuous deployments and faster delivery to clients.
Improved performance by optimizing SQL queries and implementing Redis caching layers.
Collaborated with mobile developers to design backend APIs for cross-platform applications.
Wrote automated tests with JUnit, Selenium, and Jest, improving release reliability.
Participated in architectural reviews, contributing to decisions on migrating legacy systems to modern Java + React stacks.

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Tourism (3 years), Healthcare (2.5 years), Agriculture (1.5 years), Food and Beverage (1.5 years), Banking and Finance (1.5 years), and Information Technology (1.5 years).

Tourism

Healthcare

Agriculture

Food and Beverage

Banking and Finance

Information Technology

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (8.5 years), Product Development (6 years), and Quality Assurance (1.5 years).

Information Technology

Product Development

Quality Assurance

Summary

Senior Full Stack Developer with 8+ years of experience designing and delivering high-performance applications using Java (Spring Boot, Hibernate) and React/Angular. Proven track record in building cloud-native, microservices-based architectures across SaaS, healthcare, hospitality, and e-commerce domains. Skilled in integrating AI/ML-driven modules, optimizing system scalability through DevOps automation (CI/CD, Kubernetes, Terraform), and applying architectural concepts such as hexagonal architecture for maintainability. Adept at mentoring teams, implementing blockchain-based modules for secure transactions, and consistently delivering measurable improvements in system performance, user engagement, and business outcomes.

Skills

Backend: Java (Spring Boot, Hibernate, Jpa), Rest Apis, Graphql, Microservices, Event-driven Systems
Frontend: React (Hooks, Redux, React Query), Angular, Typescript, Javascript, Css/scss
Ai & Emerging Tech: Ai/ml (Python Nlp, Tensorflow, Forecasting Models), Blockchain (Smart Contracts, Traceability, Authentication)
Cloud & Devops: Aws (Eks, Lambda, Rds, S3), Azure, Docker, Kubernetes, Terraform, Jenkins, Github Actions, Gitlab Ci/cd
Architecture: Hexagonal, Ddd, Cqrs, Event Sourcing, Api-first Design, Clean Architecture
Testing & Monitoring: Junit, Jest, Cypress, Selenium, Mockito, Datadog, Elk, Prometheus
Databases & Caching: Postgresql, Mysql, Mongodb, Redis

Languages

English

Advanced

Lithuanian

Advanced

Czech

Elementary

German

Elementary

Education

Oct 2012 - Jun 2016

Kaunas University of Technology

Bachelor of Science, Informatics · Informatics · Kaunas, Lithuania

Profile

Created

November 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Matas based?

Matas is based in Visaginas, Lithuania.

What languages does Matas speak?

Matas speaks the following languages: English (Advanced), Lithuanian (Advanced), Czech (Elementary), German (Elementary).

How many years of experience does Matas have?

Matas has at least 9 years of experience. During this time, Matas has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 2 years and 2 months. Note that Matas may not have shared all experience and actually has more experience.

What roles would Matas be best suited for?

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

What is Matas's latest experience?

Matas's most recent position is Senior Full Stack Engineer at Farmy.

What companies has Matas worked for in recent years?

In recent years, Matas has worked for Farmy and Mews.

Which industries is Matas most experienced in?

Matas is most experienced in industries like Tourism and Hospitality, Healthcare, and Banking and Finance. Matas also has some experience in Information Technology (IT), Transportation and Logistics, and Agriculture.

Which business areas is Matas most experienced in?

Matas is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

Which industries has Matas worked in recently?

Matas has recently worked in industries like Tourism and Hospitality, Agriculture, and Food and Beverage.

Which business areas has Matas worked in recently?

Matas has recently worked in business areas like Information Technology (IT) and Product Development.

What is Matas's education?

Matas holds a Bachelor in Informatics from Kaunas University of Technology.

What is the availability of Matas?

Matas is immediately available full-time for suitable projects.

What is the rate of Matas?

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