WeAreDevelopers Logo WeAreDevelopers
Sign in
For You LIVE
World Congress 2026 Europe • Jul 9, 2026 • Session details

".Net is too slow" was not an option

Tomasz Woznica

.NET isn't too slow for core banking if you architect it right. Discover how engineers used massive parallelization to execute legacy mainframe COBOL verbatim under 80 milliseconds.

Pause
Mute Enter Fullscreen
#1 about 3 min

Mainframe performance baseline and distributed computing challenges

Migrating a legacy COBOL system processing hundreds of database operations per request reveals severe network latency disparities compared to single-machine environments.

#2 about 2 min

Meeting service level agreements for batch processing

Complex end-of-day processes must execute entirely within a rigorous six-hour overnight window to consistently handle interbank transfers and system reconciliation.

#3 about 3 min

Addressing distributed database latency in driving cursors

Transitioning highly tuned database query architectures exposes extreme latency bottlenecks when repetitive cursor data trips over a network wire.

#4 about 3 min

Using session context for database workload orchestration

Passing concurrency range targets through database connection context variables limits queried batch sizes without mutating original core data retrieval signatures.

#5 about 3 min

Transparent query parallelization via source code annotations

Embedding control parameters securely inside compiler-ignored syntactical comments dynamically manages range partitions transparently avoiding original system logic alterations.

#6 about 2 min

Creating an event-driven task runner for parallel executions

Providing offset metadata allows a runtime application loop to spawn identical isolated processes against concurrent chunk segments to drastically reduce duration.

#7 about 3 min

Strategies for splitting flat files in distributed systems

Dividing large text batches into simultaneous streams requires properly aligning root rows precisely against supporting document files maintaining correct business relationships.

#8 about 2 min

Implementing virtual file splitting to minimize network overhead

Calculating precise byte skip instructions over a single network document avoids incredibly expensive temporary file duplication penalties transferring data.

#9 about 3 min

Optimizing flat file joins using network metadata pointers

Preserving resulting task array origins identically inside small referencing maps bypasses incredibly long waits inherently associated with physically appending outputs sequentially.

#10 about 3 min

Building a custom ORM to eliminate distributed transactions

Pre-fetching comprehensive contextual data mappings into transient machine-level memory prevents ongoing query repetition completely overcoming communication protocol latency limits.

#11 about 5 min

Final production metrics utilizing alternative compiler technology

Modernizing away from mainframe architecture empowers extensive transaction volume surges globally serviced quickly using entirely modern off-the-shelf distributed frameworks.

Matching moments

3:12 min

Evaluating the execution speed of legacy tech stacks

Lea Fragner · LIVE

2:23 min

Modernizing legacy execution and outdated mainframes

Ricardo Sueiras Sueiras · LIVE

6:35 min

Modernizing legacy COBOL mainframe systems using AI agents

Chris Heilmann +2 · LIVE

4:40 min

Analyzing COBOL mainframe migration challenges with AI

Michael Friedrich Michael Friedrich · World Congress 2026 Europe

1:02 min

Multi-agent AI for migrating legacy COBOL to Java

Julia Kordick Julia Kordick · World Congress 2025

8:01 min

Solving architectural challenges during rapid public cloud migrations

Liam Hurrel +1 · World Congress 2021

More from World Congress 2026 Europe

Building the Nervous System of AI - Michael Kagan (NVIDIA) thumbnail
29:17
2 months ago

Building the Nervous System of AI - Michael Kagan (NVIDIA)

Michael Kagan, Sead Ahmetović

Five Things in Tech that Matter Now - WeAreDevelopers World Congress 2026 Closing Keynote thumbnail
19:41
2 months ago

Five Things in Tech that Matter Now - WeAreDevelopers World Congress 2026 Closing Keynote

Christian Heilmann

The Sound of Your Secrets: Teaching Your Model to Spy, So You Can Learn to Defend thumbnail
32:06
2 months ago

The Sound of Your Secrets: Teaching Your Model to Spy, So You Can Learn to Defend

David vonThenen

Super scaling for the Super Bowl: How to survive 30 million users hitting your backend in 30 minutes thumbnail
35:13
2 months ago

Super scaling for the Super Bowl: How to survive 30 million users hitting your backend in 30 minutes

Irina Branovic

Running Secure Life Science Research at Scale using Hybrid GPU HPC and Kubernetes 🧬 thumbnail
24:23
2 months ago

Running Secure Life Science Research at Scale using Hybrid GPU HPC and Kubernetes 🧬

Jeremy Murray

Angstfreude - AI and Corporate Culture - The Thrill and the Threat thumbnail
30:26
2 months ago

Angstfreude - AI and Corporate Culture - The Thrill and the Threat

Axel Ebert, Karin Krobath

Upcoming sessions on this topic

Open session

World Congress 2026 North America

September 24, 2026 · 17:30–18:00

Stage 4

Boring Failover: Predictable Region Recovery Across 5,000 Microservices

Garvit Kataria, Sahil Sabharwal

Garvit Kataria
Sahil Sabharwal
Open session

World Congress 2026 North America

September 25, 2026 · 09:40–10:10

Stage 3

Still on 4.8 or lower? A Practical Guide to Moving Your "Un-Migratable" .NET Apps

Isaac Levin

Developer Advocate

Isaac Levin
Open session

World Congress 2026 North America

September 25, 2026 · 16:50–17:20

Stage 4

Engineering Moneyball: How We Benchmarked Google vs Meta

Jirka Bachel

Co-Founder & CEO

Jirka Bachel
Open session

World Congress 2026 North America

September 25, 2026 · 09:00–09:30

Stage 7

AI Agents are Only as Smart as their Context: Building a Real-Time Context Engine at Intuit

Bharat Patel

Lead Software Engineer at Intuit

Bharat Patel
Open session

World Congress 2026 North America

September 24, 2026 · 14:10–14:40

Stage 3

Real-Time Data Platforms at Trillion-Event Scale

Diptamay Sanyal

Principal Engineer | Data, AI & Cybersecurity Platforms

Diptamay Sanyal
Open session

World Congress 2026 North America

September 24, 2026 · 16:50–17:20

Stage 3

Merging at Scale: From Broken Builds to Green Mainline

Manjari Akella, Preetam Dwivedi

Manjari Akella
Preetam Dwivedi

Related videos

SMART Test Automation - the experience of legacy transformation thumbnail
30:42
World Congress 2026 Europe • 2 months ago

SMART Test Automation - the experience of legacy transformation

Leszek Włodarski

Migrating from COBOL with AI: A Moonshot Demo thumbnail
8:23
World Congress 2025 • about 1 year ago

Migrating from COBOL with AI: A Moonshot Demo

Julia Kordick

Swapping a Data Warehouse at Runtime: Zero-Downtime Migration Without Changing a Single Client thumbnail
30:28
World Congress 2026 Europe • 2 months ago

Swapping a Data Warehouse at Runtime: Zero-Downtime Migration Without Changing a Single Client

Max Fischer, Michael O'Toole

Swapping Low Latency Data Storage Under High Load thumbnail
22:32
World Congress 2023 • almost 3 years ago

Swapping Low Latency Data Storage Under High Load

George Asafev

How to Destroy a Monolith? thumbnail
26:45
World Congress 2025 • about 1 year ago

How to Destroy a Monolith?

Babette Wagner

AWS Migration within 3 months thumbnail
37:08
World Congress 2021 • about 5 years ago

AWS Migration within 3 months

Steffen Heilmann

Related articles

From learning to earning

Jobs that call for the skills explored in this talk.