30 September 2026 12:00–16:00 CEST
Confirmed Sasa Fajkovic · Engineering leader · Speaker · Builder
I lead engineering teams and build systems that scale.
As Applied AI Lead and Staff Engineer at Trade Republic, I set technical direction, grow teams and stay hands-on with architecture and software delivery.
Berlin, Germany
Speaking at conferences.
I speak about applied AI, agentic systems and engineering leadership, using examples from building and operating real systems.
Next conference
More upcoming conferences
15–16 October 2026
Confirmed 4 November 2026
Pending details 19 November 2026
Confirmed 3–4 December 2026
Confirmed Previous talks
9 July 2026 15:30–16:00 CEST
Berlin, Germany
WeAreDevelopers World Congress
Agentic employees in world's most downloaded FinTech appPlanning a conference? Tell me about your audience and the problem you want the session to help them solve.
Connect on LinkedInMy blog posts.
Practical writing about AI agents, engineering leadership and improving how organisations work.
All articles
A skill is not a markdown file
Everyone is writing agent skills right now, and most of them quietly make the agent worse. What that actually costs you, why "be thorough" is the wrong instinct, and the checks that have been gating every skill across an engineering organisation for months.
Read article
02
No AI project. Just a new hire.
What twenty teams taught me about treating an AI agent as a colleague with a defined role, identity and responsibilities.
03
I'm not building an AI Agent. I'm hiring a virtual employee.
Everyone's talking about AI agents. I keep coming back to a different question — in a remote-first world, what actually separates a human colleague from an AI one?
04
2025: The year AI learned to work (and I still didn't write enough blog posts)
A reflection on how AI agents transformed software development in 2025, my goals for building AMOS in 2026, and why powerful tools still require human discipline.
Experience
Engineering leadership shaped by building products, teaching people and working across technology and business.
01
2026 — Present
Founder
Changify · Berlin, DE
Founded Changify, an AI, process and software consultancy that helps organisations ship production software they can own long-term.
02
2022 -> Present
Applied AI Lead, Staff Engineer
Trade Republic · Berlin, DE
Led AI adoption as well as many product engineering and platform engineering teams.
03
2020 — 2022
Engineering Manager
Deutsche Kreditbank AG · Berlin, DE
Led a cross-functional backend, frontend and QA team that delivered new onboarding flows and provisioned more than 5 million customers to a new debit card.
04
Apr 2016 — Jan 2020
Lecturer
Algebra · Zagreb, Croatia
Taught ~500 people across programming and productivity courses, including web development with PHP, HTML, CSS and MySQL.
05
Jan 2016 — Jun 2019
Engineering Manager
UniCredit Group · Zagreb, Croatia
Led a full-stack engineering team delivering core retail banking products and built CRM tooling with Do Not Call registry integration.
Full professional background
Seven roles across applied AI, banking, product building and teaching.
View every roleTechnical skills
8 areas covering backend systems, delivery, infrastructure and data.
Explore technical skillsPublications and education
Nine practical books plus a master’s degree and bachelor’s degree.
See books and educationOpen-source projects.
Useful tools built from problems I encountered, documented so other engineers can inspect, run and improve them.
Agent tooling
agents-skill-eval
Evaluate agent skill packages from a local folder or GitHub URL with deterministic checks and optional AI review. Use the hosted app or run it yourself in Docker.
Unraid plugin
unraid-rsync
Schedule and monitor multiple rsync backup jobs from the Unraid web UI, with dry-runs, history and native notifications.
Personal finance
family-wealth-tracker
An open-source project for tracking family wealth. Explore the repository for its current implementation and capabilities.
Self-hosting is how I keep learning.
I run an Unraid-based home lab for storage, backups, home automation and private cloud services. It’s where I test reliable self-hosting, remote access and automation on infrastructure I operate myself.
UnraidTailscaleHome AssistantNextcloudImmichn8nPrometheusGrafanaVaultwardenrsync
Storage & private cloud
I combine on-prem and cloud solutions for my stable and experimental projects.
Home automation
Fully local, nicely automated and effective home automation using Home Assistant.
Remote access & backups
Tailscale, a separate backup node and automated rsync jobs keep it dependable.
Workflow automation
I’m building reusable workflows with n8n, with many more automations planned across my systems.