Hi, I'm Stefan Lazarevic

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About Me

I'm a FinTech Manager and Solution Architect with deep expertise in building scalable software systems, microservices architecture, and cloud solutions on AWS.

I lead engineering teams to modernize legacy systems into cloud-native SaaS platforms, specializing in FinTech solutions that drive real business impact.

My passion lies in solving complex technical challenges while mentoring teams and delivering enterprise-grade solutions that scale.

10+

Years Enterprise Experience

50+

Projects Delivered

97%

Process Optimization

4

Languages Spoken

Skills & Expertise

Backend Development

Java ColdFusion Spring Boot Spring Cloud Node.js Go Python REST APIs Microservices

Frontend Development

React.js JavaScript TypeScript HTMX Bootstrap Micro-Frontends

Cloud & DevOps

AWS Kubernetes Docker GitLab CI/CD Jenkins Kafka Grafana

Databases

PostgreSQL MongoDB IBM DB2 ETL Batch Processing

Leadership

Technical Management Project Management Solution Architecture Agile Scrum Team Mentorship

Emerging Tech

AI Prompt Engineering Drone Programming DJI SDK Tello SDK

Experience

Technical Product Management

Zurich Insurance / Real Garant

Nov 2019 - Present | Zurich, Switzerland

  • Led team of 8 engineers building FinTech solutions for claims, invoices, and warranty systems
  • Migrated monolithic systems to microservices on AWS, improving deployment speed by 60%
  • Reduced invoice processing time by 97% (from 30 days to 1 day), saving 200+ hours monthly
  • Developed microservices with React.js, Node.js, Spring Boot, and Go
  • Implemented custom MFA solution using Java and Spring Security

FinTech Manager & Solution Architect

Optima Apps

Nov 2019 - Present | Belgrade, Serbia

  • Lead cross-functional team of 12+ engineers modernizing FinTech systems to cloud-native SaaS
  • Design cloud architecture and migrate services to AWS, reducing infrastructure costs by 40%
  • Optimize application pipelines using Java, ColdFusion, Node.js, React.js, and Go
  • Provide IT consulting and strategic technology planning

Senior Software Engineer & Drone Developer

SlStudio

Dec 2018 - Jun 2020 | Belgrade, Serbia

  • Built automation systems using Python, DJI SDK, and Tello SDK
  • Managed drone assembly, programming, and calibration

Startup Founder & Engineer

PowerBattery

Sep 2016 - Sep 2019 | Shenzhen, China

  • Founded eco-friendly powerbank company using recycled batteries
  • Designed battery management systems to reduce e-waste
  • Managed product development from prototype to manufacturing

Education

Metropolitan University Belgrade

Information Technology

Coursework completed (2 years)

University of Nis

Software Engineering

Faculty of Electronic Engineering | Coursework completed (2 years)

Projects

Enterprise

Enterprise

Zurich Insurance Platform

Global insurance and financial services platform serving millions of customers worldwide.

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Enterprise

Real Garant

Automotive warranty and insurance management platform for the European market.

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Open Source

Open Source

Factura-Lazare

Professional invoice management with PDF export, client management, and financial tracking.

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Open Source

LazareBTCTrack

Bitcoin wallet tracker with real-time analytics, portfolio monitoring, and multi-currency support.

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Open Source

TracktLazare

Expense tracker with budgeting, data visualization, and multi-format export capabilities.

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Open Source

PythonTelloDroneAI

Drone automation platform using Python and Tello SDK for autonomous flight operations.

View GitHub

Currently Seeking

In-House Manager

Seeking a leadership role where I can drive strategy, mentor teams, and deliver enterprise-grade solutions. PMP certified approach to project delivery and organizational excellence.

  • Technical Team Leadership
  • Project Management (PMP)
  • Solution Architecture
  • Digital Transformation

New Projects & Clients

Open to consulting engagements, freelance projects, and long-term partnerships. Specializing in FinTech, SaaS, and cloud-native solutions.

  • IT Consulting
  • SaaS Development
  • Cloud Architecture
  • System Modernization

Get in Touch

I'm always open to discussing new projects, creative ideas, or opportunities to be part of your vision.

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