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I am a Senior Software Developer with over 6 years of experience in back-end, full-stack, and cloud-native systems. I specialize in modernizing legacy enterprise applications, building REST APIs, and introducing DevOps and QA practices. My expertise spans Java, Kotlin, Python, C#, SQL/NoSQL databases, AWS, Docker, Redis, CI/CD pipelines, NodeRed, and additional experience in AI/ML using reinforcement learning and MLFlow. I have successfully led teams and managed QA to mentor secure coding and TDD practices across various technologies including Java, Kotlin, Python, and TypeScript. I have a proven track record in migrating legacy applications, enhancing performance, and delivering robust, scalable software solutions in diverse sectors such as healthcare, research, and leasing platforms.…I am a Senior Software Developer with over 6 years of experience in back-end, full-stack, and cloud-native systems. I specialize in modernizing legacy enterprise applications, building REST APIs, and introducing DevOps and QA practices. My expertise spans Java, Kotlin, Python, C#, SQL/NoSQL databases, AWS, Docker, Redis, CI/CD pipelines, NodeRed, and additional experience in AI/ML using reinforcement learning and MLFlow. I have successfully led teams and managed QA to mentor secure coding and TDD practices across various technologies including Java, Kotlin, Python, and TypeScript. I have a proven track record in migrating legacy applications, enhancing performance, and delivering robust, scalable software solutions in diverse sectors such as healthcare, research, and leasing platforms.

Toader Carausus

Full Stack Developer, Data Scientist, Developer

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I am a Senior Software Developer with over 6 years of experience in back-end, full-stack, and cloud-native systems. I specialize in modernizing legacy enterprise applications, building REST APIs, and introducing DevOps and QA practices. My expertise spans Java, Kotlin, Python, C#, SQL/NoSQL databases, AWS, Docker, Redis, CI/CD pipelines, NodeRed, and additional experience in AI/ML using reinforcement learning and MLFlow. I have successfully led teams and managed QA to mentor secure coding and TDD practices across various technologies including Java, Kotlin, Python, and TypeScript. I have a proven track record in migrating legacy applications, enhancing performance, and delivering robust, scalable software solutions in diverse sectors such as healthcare, research, and leasing platforms.…I am a Senior Software Developer with over 6 years of experience in back-end, full-stack, and cloud-native systems. I specialize in modernizing legacy enterprise applications, building REST APIs, and introducing DevOps and QA practices. My expertise spans Java, Kotlin, Python, C#, SQL/NoSQL databases, AWS, Docker, Redis, CI/CD pipelines, NodeRed, and additional experience in AI/ML using reinforcement learning and MLFlow. I have successfully led teams and managed QA to mentor secure coding and TDD practices across various technologies including Java, Kotlin, Python, and TypeScript. I have a proven track record in migrating legacy applications, enhancing performance, and delivering robust, scalable software solutions in diverse sectors such as healthcare, research, and leasing platforms.

Available to hire

I am a Senior Software Developer with over 6 years of experience in back-end, full-stack, and cloud-native systems. I specialize in modernizing legacy enterprise applications, building REST APIs, and introducing DevOps and QA practices. My expertise spans Java, Kotlin, Python, C#, SQL/NoSQL databases, AWS, Docker, Redis, CI/CD pipelines, NodeRed, and additional experience in AI/ML using reinforcement learning and MLFlow.

I have successfully led teams and managed QA to mentor secure coding and TDD practices across various technologies including Java, Kotlin, Python, and TypeScript. I have a proven track record in migrating legacy applications, enhancing performance, and delivering robust, scalable software solutions in diverse sectors such as healthcare, research, and leasing platforms.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Romanian, Moldavian, Moldovan

Fluent

English

Fluent

Russian

Advanced

French

Intermediate

German

Beginner

Work Experience

Senior Software Developer at Lion Software GmbH

January 1, 2025 - Present

Modernised a 30-year-old leasing platform for one of Germany's largest leasing companies, ensuring regulatory compliance and preventing client fines. Improved API latency dramatically, refactored codebase from Java to Python enhancing response times significantly. Secured REST API with robust session management. Upgraded technology stack including Java 1.8 to 21, Python 3.8 to 3.12, Ubuntu 20 to 24, and PostgreSQL 12 to 17. Developed testing frameworks from scratch boosting defect detection by 35%. Created RMI conversion/testing tools for cross-language interoperability between Java and Python. Provided team leadership and QA mentoring introducing automated CI/CD pipelines and authoring Git workflow and QA guidelines.

Machine Learning Engineer at Play Yoli

July 1, 2024 - September 1, 2025

Designed reinforcement learning experiments in an open-ended multi-stage game comparing multiple training strategies. Built Python data pipelines to capture children's play sessions and train human-like behavioral models. Conducted MLFlow analysis on 200+ runs evaluating parameters and performance, facilitating lightweight experimental architecture for rapid approach comparison.

Full-Stack Developer / Data Scientist (.NET, C#) at ICES (International Council for the Exploration of the Sea)

February 1, 2023 - September 1, 2025

Migrated legacy .aspx applications to Razor Pages (.NET Core) with REST microservices and SQL Server backend. Delivered REST APIs and reporting tools for researchers integrating workflows for reproducible, cloud-based reporting and data access.

Software Developer / Data Analyst at Lión Software GmbH

December 1, 2023 - September 1, 2025

Migrated analytics pipelines converting AWS S3 JSON data to Parquet format using Lambda and Glue. Integrated dashboards with AWS QuickSight and dockerized Python Lambdas tested with Pytest and Moto. Enhanced Kotlin prototype with AWS Cognito integration.

Kotlin and Android Developer at Step Up Solutions (Air)

August 1, 2020 - December 31, 2021

Developed an IoT healthcare solution for COPD monitoring on Android with Firebase NoSQL backend and Kotlin coroutines. The solution was approved by the Danish Medical Association as one of Denmark's first IoT COPD monitors.

Backend Developer (Java) at Endava

September 1, 2018 - September 1, 2025

Built REST APIs with Java Spring Boot and PostgreSQL integrated with Jenkins CI/CD pipelines. Developed unit and integration tests using JUnit and Mockito ensuring safe inter-service interactions.

Kotlin and Android Developer

December 1, 2021 - September 1, 2025

Enhanced Kotlin prototype including AWS Cognito integration, Dockerized workflows, and testing pipelines for cloud-based data processing.