Marcin Zając

Software Architect & Consultant

I'm a software architect with 6+ years of hands-on engineering experience. I've designed and built systems across investment, healthcare, real estate, logistics, and more, working with teams from Europe, Asia, and North America.

My background is in mathematics, not computer science. That shaped how I approach problems: analytically, with focus on structure and trade-offs rather than chasing the latest framework. I treat technologies as tools. I pick the right one for the job, not the other way around.

What sets me apart from many architects: I code. I don't just draw diagrams and hand them off. I design the system, build the critical foundations, set up the infrastructure, and stay involved through production. I've led vendor handovers, legacy rebuilds, enterprise migrations, and greenfield projects, often as the person who owns the outcome end to end.

Experience

Senior Software Engineer

Sep 2022 - Present

Pragmatic Coders

Worked across 10+ projects in investment, healthcare, crypto, medical, real estate, and logistics. Took full ownership in client-facing roles, covering backend architecture, implementation, DevOps, and Scrum Master responsibilities.

  • Promoted from Backend Engineer through Full Stack to Senior for ownership and technical leadership
  • Leading backend development across dozens of microservices and 3 web frontends (logistics, Poland)
  • Co-led design and delivery of enterprise data migration system (real estate SaaS, UAE)
  • Rebuilt legacy HR system from scratch with modern stack (Sweden)

Node.js Backend Developer

Apr 2021 - Aug 2022

iteo

Developed backend services for web products in banking (MVP), HR, and food-ordering domains. Worked closely with business stakeholders to translate requirements into working systems.

Chatbot Developer

Jul 2019 - Mar 2021

Capgemini

Built and deployed cloud-based chatbot solutions on GCP for internal and enterprise clients.

Reporting Specialist

Aug 2018 - Jun 2019

PwC SDC

Automated reporting workflows in Excel VBA, reducing manual workload. First hands-on programming experience that started the path into software engineering.

Education

Bachelor's degree in Mathematics

2015 - 2018

The Silesian University of Technology

Skills

Backend

Node.js TypeScript Java Spring Boot NestJS GraphQL REST

Cloud & Infrastructure

Azure GCP AWS Kubernetes Docker CI/CD Grafana

Data

PostgreSQL CosmosDB MongoDB MySQL Redis Event-driven Architecture

Architecture & Leadership

System Design Microservices Legacy Modernization Scrum Mentoring Stakeholder Management

Get in touch

Interested in working together or have a technical challenge to discuss? Reach out.

m.zajac995@gmail.com GitHub LinkedIn