13-15 OCTOBER, 2025

Global Software Architecture Summit

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About GSAS 2025

Software Architecture and Business Value: Balancing Tradeoffs

GSAS 2025 will explore the critical relationship between software architecture decisions and the long-term success of a business. This edition focuses into how architects and business leaders can effectively balance technical considerations with strategic business goals. Attendees will gain insights on making informed tradeoffs between scalability, security, cost, and agility while ensuring alignment with overall business value.

Conference Talks & Workshops

The GSAS Edition 2025 conference spans three dynamic days, each filled with insightful talks and hands-on workshops, available both live and on-demand for maximum flexibility.

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25+
Speakers
GSAS 2025 Topics

Software Architecture and Business Value: Balancing Tradeoffs

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Talks

Expert speakers will share insights on balancing software architecture decisions with business goals, covering tradeoffs between scalability, security, cost & agility.

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Networking

Connect with industry professionals, share experiences, and build valuable relationships with fellow architects and business leaders.

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Workshops

Hands-on, interactive sessions offering practical strategies to tackle common architectural challenges and align technical decisions with business objectives.

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Sponsors

Discover innovative products and services from event sponsors that can enhance your software architecture practices and support business growth.

Top Software Experts

Speakers Confirmed

Sonya Natanzon
Sonya Natanzon
VP of Engineering at Heartflow
Vlad Khononov
Vlad Khononov
Software Engineer & Author
Luca Mezzalira
Luca Mezzalira
Principal Solutions Architect at AWS
Blaize Stewart
Blaize Stewart
Enterprise Architect at GBLI
Javiera Laso
Javiera Laso
Lead Engineer Consultant at Thoughtworks
Eoin Woods
Eoin Woods
Independent Consultant & Co-Author of Continuous Architecture in Practice
Uwe Friedrichsen
Uwe Friedrichsen
CTO at Codecentric
Andreas Calvo
Andreas Calvo
Principal Solutions Architect at AWS
Gien Verschatse
Gien Verschatse
Consultant & Software Engineer
Chris Simon
Chris Simon
Technology Coach & Advisor
Avi Levi
Avi Levi
R&D Leader & Software Architect
Anyul Rivas
Anyul Rivas
Principal Software Engineer at Ingram Micro
Avraham Poupko
Avraham Poupko
Head of Product Security at Forescout
Mandeep Singh
Mandeep Singh
Software Engineer & O’Reilly Author “System Design on AWS”
Luis Rubiera
Luis Rubiera
CTO at Cloud-IAM
Dan Neciu
Dan Neciu
Software Engineer & Tech Founder at CareerOS
Enrique Medina
Enrique Medina
Senior Solution Architect & Technical Leader
Nestor Lopez
Nestor Lopez
Platform Engineer at Zephyr Cloud
Eric Nikkelen
Eric Nikkelen
Founder & CEO at ReqVision
Karol Wiszowaty
Karol Wiszowaty
COO & Delivery Director at Inspeerity
GSAS 2025 Schedule

Agenda

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13, Oct - 2025
8:00 AM – 8:45 AM

Registration & Coffee

Reception
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13, Oct - 2025
8:45 AM – 9:00 AM

Opening Ceremony

Main Stage
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13, Oct - 2025
9:00 AM – 9:50 AM

The Key to the Prisoner's Dilemma by Sonya Natanzon

Business value and the software architecture behind it often seem like a zero-sum game — one thriving at the other’s expense. But what if there’s a better way? By solving the Prisoner’s Dilemma, architects can turn trade-offs into a virtuous circle where both technology and business win.

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13, Oct - 2025
10:00 AM – 10:50 AM

Future-Proofing Applications: The Strategic Value of Refactoring in Cloud Migration by Blaize Stewart

Do I lift-and-shift? Do I rewrite? Do I do something else? These questions pervade the thinking of organizations that are thinking about cloud migrations, either from on-prem, or even cloud to cloud. Cloud migration will often begin with a lift-and-shift approach that offer a rapid transition to the cloud. However, while this method enables quick adoption, the long-term implications—particularly around cost, scalability, and agility—can challenge an organization’s ability to maximize business value.

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13, Oct - 2025
10:50 AM – 11:30 AM

Coffee Break + Breakfast

Lobby P0+P1
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13, Oct - 2025
11:30 AM – 12:20 PM

Decoupling By Design: An Opinionated Implementation of the Hexagonal Architecture by Enrique Medina

This talk presents a deep dive into an opinionated implementation of Hexagonal Architecture, offering practical strategies for creating robust, maintainable, and adaptable software systems. We'll explore advanced concepts that go beyond basic architectural patterns, focusing on techniques that promote true decoupling and clean design. From tackling "Dark Code" to implementing an Always-Valid Domain Model, this session will equip you with powerful tools to elevate your software design skills.

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13, Oct - 2025
12:30 PM – 13:20 PM

Pragmatic Architecture: How to Know When It’s Enough by Vlad Khononov

Overengineering wastes time and effort, while underengineering creates future pain. How do you strike the right balance? This talk explores how you can use the balanced coupling model to achieve the just-right engineering. You’ll learn to predict volatility of software components using domain-driven design, Wardley maps, and other proven techniques. Finally, we’ll cover software design strategies that adapt to different volatility levels, ensuring stability without unnecessary complexity or wasted resources.

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13, Oct - 2025
13:20 PM – 14:30 PM

Lunch

Lobby P0+P1
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13, Oct - 2025
14:30 PM – 15:20 PM

The Art of Designing Simple, Scalable Systems by Madeep Singh

Simplicity is often lost in pursuit of system scalability. Figuring out simple solutions for a complex problem is an art. Simple solutions scale well with time and improves developer velocity, system reliability and reduce overall operational burden and cost.

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13, Oct - 2025
15:30 PM – 16:20 PM

Scaling a Javascript Application from 0 to a Brazilian users by Dan Neciu

Every project / app starts small and grows and grows until it becomes a hot mess of spaggetti Carbonara. You try to follow all the best practices and advice and in the end the result is the same. In this talk I will go though my case study on how I managed to scale my application to millions of users and keep the code tidy and clean.

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PAID WORKSHOP
14:30 PM – 16:30 PM

User Story Writing: Where architecture and business intersect (I)

Software architects continuously make design choices by balancing trade-offs to achieve business outcomes. One of the most impactful moments for these decisions is during user story writing. User stories are the building blocks of business value, yet too often, engineers and architects leave this process entirely to product managers. As a result, instead of engaging in problem-solving, they receive prescriptive solutions—missing a critical opportunity to shape architecture early.

Workshop Room 01
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PAID WORKSHOP
14:30 PM – 16:30 PM

TBC

TBC.

Workshop Room 03
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13, Oct - 2025
16:30 PM – 17:00 PM

Drinks + Snacks

Lobby P0+P1
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13, Oct - 2025
17:00 PM – 18:00 PM

Auction & Closing

Main Stage
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14, Oct - 2025
8:30 AM – 8:45 AM

Registration & Coffee

Reception
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14, Oct - 2025
8:45 AM – 9:00 AM

Opening Ceremony

Main Stage
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14, Oct - 2025
9:00 AM – 9:50 AM

Modularity: the key characteristic for software excellence by Luca Mezzalira

Software modularity is a powerful design approach that transforms how we build and maintain complex systems. By breaking software into smaller, independent modules, we create more flexible, scalable, and manageable solutions. This concept extends far beyond code, influencing organizational structures, team dynamics, and system architectures. In this keynote, we'll explore how modularity shapes modern software development and its far-reaching implications. We'll discuss how it enables organizations of all sizes to build robust, adaptable systems. From startups to large enterprises, modularity allows teams to work more efficiently and respond quickly to changing needs.

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14, Oct - 2025
10:00 AM – 10:50 AM

Architecting Scalable and Resilient EV Charging Infrastructure: Lessons from the Field by Avi Levi

This session explores real-world challenges of designing software architectures for large-scale EV charging networks. We'll be discussing OCPP, microservices, event-driven architectures, domain driven architecture and load balancing strategies.

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14, Oct - 2025
10:50 AM – 11:30 AM

Coffee Break + Breakfast

Lobby P0+P1
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14, Oct - 2025
11:30 AM – 12:20 PM

From here to resilience - a travel guide by Uwe Friedrichsen

Resilience is an important issue in the VUCA world of today. Many companies claim to have a resilient IT, very few have one. What does it mean to be resilient? How do I get there? How can I improve? Which discussions, which tradeoffs, which obstacles are involved? We will look at several gradations of becoming resilient. We will examine their properties and tradeoffs and how to get there. We will discuss what we can achieve at an IT system level, when we need to address the whole socio-technical system and when we need to cross the boundaries of the IT organization. We will also understand the impact of a resilient IT on the long-term viability of a company and the tradeoffs involved. At the end of the session, we will have drawn a map from here to resilience you can use as a travel guide towards your resilient IT.

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14, Oct - 2025
12:30 PM – 13:20 PM

TBC by Andreas Calvo

TBC.

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14, Oct - 2025
13:20 PM – 14:30 PM

Lunch

Lobby P0+P1
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14, Oct - 2025
14:30 PM – 15:20 PM

The New Realities of SaaS: Why Building is Harder Than Ever by Luis Rubiera

Creating a SaaS product today is more complex than it used to be. From the start, you need to think beyond just building a great service—you have to understand operational constraints, legal requirements, and the geopolitical factors that can shape your market. Compliance, reliability, and cross-border regulations are no longer afterthoughts but key elements of success. This talk explores what it really takes to launch and scale a SaaS in 2025 and why ignoring these factors can be a costly mistake.

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14, Oct - 2025
15:30 PM – 16:20 PM

TBC

TBC

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PAID WORKSHOP
14:30 PM – 16:30 PM

User Story Writing: Where architecture and business intersect (II)

In this extended workshop, you’ll learn how to recognize business value, craft clear problem statements, and transform them into well-defined user stories. You’ll also learn how to identify and improve weak user stories. Additionally, we will dive into techniques for breaking down large user stories into smaller, incremental ones—ensuring each delivers meaningful business value while maintaining architectural integrity. More importantly, you’ll discover how user story writing can be a collaborative design activity—empowering engineers to explore trade-offs, drive creativity, and contribute meaningfully to both architecture and business success.

Workshop Room 01
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PAID WORKSHOP
14:30 PM – 16:30 PM

TBC

TBC.

Workshop Room 03
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14, Oct - 2025
16:30 PM – 17:00 PM

Drinks + Snacks

Lobby P0+P1
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14, Oct - 2025
17:00 PM – 18:00 PM

Auction & Closing

Main Stage
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15, Oct - 2025
8:00 AM – 8:45 AM

Registration & Coffee

Reception
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15, Oct - 2025
8:45 AM – 9:00 AM

Opening Ceremony

Main Stage
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15, Oct - 2025
9:00 AM – 9:50 AM

A Defence of Technical Excellence by Chris Simon

The speed / quality trade-off fallacy gets many teams stuck in negative feedback loops - sacrificing quality for speed, both are lost. Teams find their backlogs filled with bugs, their stakeholders frustrated by missed deadlines and the teams themselves unhappy and stressed. Systems thinking, and in particular using causal loop diagrams to identify the feedback loops at play can shed light on how and why the fallacy is so tempting yet so destructive. In this talk I'll demonstrate the building of a range of causal feedback loops to visualise the underlying causes of the problems. With such visualisations we can advocate for the practices of technical excellence that counter the pressures of the fallacy, such as collaborative modelling with domain-driven design, test driven development & living documentation.

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15, Oct - 2025
10:00 AM – 10:50 AM

The Cost of Good Intentions: Anti-Patterns in Architecture Modernization by Javiera Laso

Modernizing legacy systems seemed exciting...until I found myself absorbed in rewrites, facing business blockers, and watching tech debt pile up instead of shrink. In this talk, I’ll share the biggest traps I’ve seen and experienced firsthand while working on modernization efforts in large organizations—and what helped us avoid (or recover from) them. From picking the wrong architecture patterns too early to losing stakeholder trust halfway through, I’ll walk through real examples of what not to do, along with the principles and strategies that helped us get back on track. Whether you’re breaking down a monolith or updating a business-critical system, I’ll help you steer clear of common pitfalls and make smarter, more sustainable decisions.

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15, Oct - 2025
10:50 AM – 11:30 AM

Coffee Break + Breakfast

Lobby P0+P1
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15, Oct - 2025
11:30 AM – 12:20 PM

Reversible vs. Irreversible Decisions: The Art of Architectural Flexibility by Avraham Poupko

Can Architecture be too flexible? Is there a price to be paid for extreme decoupling? This is a technical talk for architects and coders. In this talk I explore how can we balance our need for flexibility in the face of the unknown, with the need for reducing complexity. I will provide a few thought frameworks and practical tips and practicies for arriving at a better decision.

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15, Oct - 2025
12:30 PM – 13:20 PM

Renovate or Rebuild? Architectural techniques for the million euro tradeoff by Eoin Woods

At some point most of us will face the critical decision of whether to modernize a legacy system or rebuild it from scratch. While these decisions can make or break budgets and careers, I have observed that they are often driven by emotion, outdated assumptions and optimism, rather than facts, data and clear rationale. This talk explains how an architecture-driven approach can help us to address the renovate-versus-rebuild dilemma, by moving beyond assumptions to use a decision framework based on proven architectural knowledge.

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15, Oct - 2025
13:20 PM – 14:30 PM

Lunch

Lobby P0+P1
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15, Oct - 2025
14:30 PM – 15:20 PM

TBC

TBC

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15, Oct - 2025
15:30 PM – 16:20 PM

TBC

TBC

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PAID WORKSHOP
14:30 PM – 16:30 PM

Slow down to speed up your decision-making by Gien Verschatse

In many software teams, decisions are often driven by habits, blindly following best practices, or the latest trends - rather than a clear understanding of the problem. Microservices are a perfect example. Teams often break systems into smaller services because it feels like the “right” approach and everyone else is doing it too. Before a single service is deployed, the architecture is already overcomplicated, not because of bad intentions, but because we never stopped to ask: what problem are we actually trying to solve?

Workshop Room 01
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PAID WORKSHOP
14:30 PM – 16:30 PM

TBC

TBC.

Workshop Room 03
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15, Oct - 2025
16:30 PM – 17:00 PM

Closing Ceremony

Main Stage
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15, Oct - 2025
17:00 PM – 19:00 PM

Cocktail

Lobby P0
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Speakers
600+
Event Participants

Europe’s Leading Software Architecture Event

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GSAS 2025 Tickets

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400€

Blind Ticket

Access to the 3-day conference (excludes paid workshops).

  • 3 day conference pass
  • Food & Beverage included
  • Optional: Paid Workshops
18/02/2025 - 15/03/2025
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450€

Early Bird Ticket

Access to the 3-day conference (excludes paid workshops).

  • 3 day conference pass
  • Food & Beverage included
  • Optional: Paid Workshops
16/03/2025 - 30/04/2025
Available

500€

Regular Ticket

Access to the 3-day conference (excludes paid workshops).

  • 3 day conference pass
  • Food & Beverage included
  • Optional: Paid Workshops
01/05/2025 - 30/06/2025 Buy Now
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GSAS 2025

Europe’s Leading Software Architecture Event

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Questions on GSAS

Frequently Asked Questions

Can tickets be purchased on the day of the event?

Unfortunately, tickets cannot be purchased on the day of the event. They are available exclusively through our website until we sell out. We recommend securing your ticket in advance to ensure your spot at the event.

I can no longer attend, can I get a refund?

Tickets are not refundable.

Can I transfer my ticket to another person?

If you are unable to attend, you can transfer your ticket to another person. Please notify us in advance by emailing gsas@apiumhub.com to ensure a smooth transfer process.

I can’t pay by credit card; is there an alternate payment method?

Please contact gsas@apiumhub.com, and we’ll be happy to discuss alternative payment methods that work for you.

What is the dress code for the conference?

There is no strict dress code for the conference. We encourage you to come as you feel comfortable.

Is the conference pet-friendly?

We’re sorry, but the conference is not pet-friendly.

I have an organization, can I participate as a supporter?

Yes, you can participate as a supporter! Please send us a message at gsas@apiumhub.com with your request, and we’ll be happy to discuss the details with you.

Do you offer discount for groups?

Yes, we offer group discounts for participants registering in groups of 3 or more! These special rates will be automatically applied during the checkout process.