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Hi! I'm Sergiu, a results-driven Software Engineer with over 6 years of experience building scalable web applications. I specialize in Python, JavaScript, and cloud technologies, always striving to deliver high-quality code and optimize performance. I enjoy working on challenging projects and continuously improving my skills. I'm passionate about collaborating with teams and leading development efforts, as shown during my experience managing a dev team and founding my own React Native-based startup. I love finding innovative solutions and learning the latest technologies to build impactful software.…Hi! I'm Sergiu, a results-driven Software Engineer with over 6 years of experience building scalable web applications. I specialize in Python, JavaScript, and cloud technologies, always striving to deliver high-quality code and optimize performance. I enjoy working on challenging projects and continuously improving my skills. I'm passionate about collaborating with teams and leading development efforts, as shown during my experience managing a dev team and founding my own React Native-based startup. I love finding innovative solutions and learning the latest technologies to build impactful software.

Sergiu Mironescu

Developer, Web Developer, Programmer, +1

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Hi! I'm Sergiu, a results-driven Software Engineer with over 6 years of experience building scalable web applications. I specialize in Python, JavaScript, and cloud technologies, always striving to deliver high-quality code and optimize performance. I enjoy working on challenging projects and continuously improving my skills. I'm passionate about collaborating with teams and leading development efforts, as shown during my experience managing a dev team and founding my own React Native-based startup. I love finding innovative solutions and learning the latest technologies to build impactful software.…Hi! I'm Sergiu, a results-driven Software Engineer with over 6 years of experience building scalable web applications. I specialize in Python, JavaScript, and cloud technologies, always striving to deliver high-quality code and optimize performance. I enjoy working on challenging projects and continuously improving my skills. I'm passionate about collaborating with teams and leading development efforts, as shown during my experience managing a dev team and founding my own React Native-based startup. I love finding innovative solutions and learning the latest technologies to build impactful software.

Available to hire

Hi! I’m Sergiu, a results-driven Software Engineer with over 6 years of experience building scalable web applications. I specialize in Python, JavaScript, and cloud technologies, always striving to deliver high-quality code and optimize performance. I enjoy working on challenging projects and continuously improving my skills.

I’m passionate about collaborating with teams and leading development efforts, as shown during my experience managing a dev team and founding my own React Native-based startup. I love finding innovative solutions and learning the latest technologies to build impactful software.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Spanish; Castilian

Fluent

Catalan; Valencian

Intermediate

English

Intermediate

Romanian, Moldavian, Moldovan

Fluent

Work Experience

Software Developer / Technical Architect at Quantum ML Trading

May 1, 2025 - July 17, 2025

Worked extensively with Python, Tensorflow, scikit-learn, and pandas for data preprocessing and machine learning modeling including Logistic Regression, Random Forest, XGBoost, CatBoost, and Neural Networks such as MLP, LSTM, GRU, and CNN. Developed sentiment models, feature extraction using TSFresh and FeatureTools, and implemented optimization with Optuna and Hyperopt. Delivered a live demo chart and worked on parallel execution and multitasking pipelines.

Software Engineer / Lead Software Engineer at ROCHE Diagnostics Europe

April 1, 2023 - July 17, 2025

Developed web applications using Python (Django), React JSX with Redux, React Testing Library, and Typescript. Utilized AWS cloud services, Github Actions, and JIRA in Agile environments. Collaborated with external machine learning companies and medical hospitals. Led a development team of 3, improving productivity by approximately 25%.

React Native (Software Engineer/ Creator / Founder) at Moodem

October 1, 2021 - July 17, 2025

Founded and developed a React Native application focusing on realtime communication using websockets (socket.io). Managed user registration, login, profile management, and implemented modules for chat, songs, and voting systems. Utilized Github, Firebase, NodeJS, and handled mobile app deployment via XCode and Apple.

Javascript Developer / Engineering Lead – LATAM Office Expansion at Marfeel

February 1, 2021 - July 17, 2025

Worked with Javascript, HTML, CSS, and Java while developing React components. Managed metrics and used tools like Google Lighthouse, JIRA, Kibana, Prometheus, and PagerDuty. Led technical interviews, onboarding, mentoring, and training for new hires. Helped set up infrastructure, tooling, and team structure for a new office, assisting in hiring and onboarding over 10 engineers and reducing ramp-up time by 40%. Established best practices and Git workflows.