Bartłomiej Rasztabiga's Resume

Bartłomiej Rasztabiga

Senior Software Engineer

Warsaw, Poland, CET

About

Senior Software Engineer specializing in distributed systems and event-driven architecture, with 6+ years in fintech and HR tech. Built and led end-to-end delivery of cloud-native systems at scale, eventually taking on Technical Lead ownership of architecture and technical direction. Currently applying LLM-based agents to automate workflows and enhance product capabilities.

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Work Experience

Symmetrical.ai

Jan 2022 -

Senior Software Engineer

  • Built HRIS and Payroll platform from 0 to 173 enterprise clients and 2,124 MAU on a distributed system of 33 microservices processing 17.6M requests/month, at a startup backed by $18.5M Series A funding.
  • Navigated two major product pivots, maintaining system stability and team alignment throughout.
  • Took leadership of several technical initiatives and team deliveries, eventually assuming end-to-end ownership as Technical Lead of a 6-person engineering team, overseeing architecture, delivery, and technical direction.
  • Introduced LLM-based agents to automate internal workflows and enhance product capabilities.

Tech stack: Kotlin, Spring Boot, MongoDB, Apache Kafka, Kubernetes, AWS, TypeScript, React.js, Mastra

  • Warsaw

Sollers Consulting

Jul 2021 - Jan 2022

Software Engineer

  • Developed new features for the internal HRIS platform used daily by 1,000+ Sollers employees, working on both backend and frontend layers.

Tech stack: Java, Spring Boot, PostgreSQL, React.js, TypeScript

  • Warsaw

Ignite Software Development

Jul 2020 - Jul 2021

Software Engineer

  • Led a team of engineers to deliver a SaaS financial reporting platform, reducing report generation time by 60%.
  • Provided consulting support for enterprise clients integrating and customizing solutions on the Salesforce CPQ platform.

Tech stack: Kotlin, Spring Boot, PostgreSQL, Kubernetes, Google Cloud Platform

  • Remote

Transition Technologies PSC

Jul 2017 - Aug 2017

Embedded Software Engineer - Internship

  • Developed a C++ framework to simplify the creation of IoT devices using the ESP8266 platform, enabling faster prototyping of sensor and actuator modules.

Tech stack: C++, Arduino Framework

Education

Warsaw University of Technology

2020 - 2024
Bachelor's Degree in Computer Science. Specialization: Software Engineering

Warsaw University of Technology

2024 - 2026
Master's Degree in Computer Science. Specialization: Intelligent Systems

Skills

  • Kotlin
  • Java
  • Python
  • TypeScript
  • Spring Boot
  • FastAPI
  • React.js
  • GraphQL
  • MongoDB
  • PostgreSQL
  • Apache Kafka
  • Kubernetes
  • AWS
  • Qdrant
  • DDD
  • Hexagonal Architecture
  • Distributed Systems
  • CQRS
  • Event Sourcing
  • AI agents
  • RAG
  • LLM integrations
  • Mastra

Side projects

Master's Thesis

PaaS enabling all developers to easily run their apps in cloud using LLMs for generating Docker and Kubernetes configurations.

  • Thesis Project
  • Python
  • Docker
  • Kubernetes
  • AI

Bachelor's Thesis

Food ordering system build with microservices, DDD, CQRS and Event Sourcing in mind.

  • Thesis Project
  • Kotlin
  • Spring Boot
  • Axon Framework
  • MongoDB
  • TypeScript
  • Remix.js

eCommute

Tempting new public transport users with financial benefits e.g. tickets cashback. This app has won the 7th edition of BHL Hackathon.

  • Hackathon Project
  • TypeScript
  • React.js
  • GraphQL
  • Next.js
  • Prisma
  • MongoDB

RedAlert

System allowing users to send emergency requests (with their location) to appropriate public service based on a series of questions. This app has won Hackathon Idea Kielce 2018.

  • Hackathon Project
  • TypeScript
  • React.js
  • React Native
  • Express.js
  • WebSockets

ReadMe

Mobile app trying to help people keep motivated to read their books using reminders and progress statistics.

  • Side Project
  • Java
  • Android