# legacy systems

Legacy systems are older computer systems, programming languages, or application software that remain in use despite newer alternatives being available.

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## Why agentic AI starts with legacy modernisation

DevFeed: [Why agentic AI starts with legacy modernisation](<https://devfeed.tech/articles/why-agentic-ai-starts-with-legacy-modernisation-33597.md>)

Original publisher: [Read original article](<https://blog.scottlogic.com/2026/08/21/why-agentic-ai-starts-with-legacy-modernisation.html>)

Author: Suzanne Angell

Published: 2026-08-21T09:33:00Z

Content type: opinion

Language: en

Sources: [Scott Logic](<https://devfeed.tech/sources/scott-logic.md>)

Topics: [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [AI Agent](<https://devfeed.tech/topics/ai-agent.md>), [legacy](<https://devfeed.tech/topics/legacy.md>), [legacy systems](<https://devfeed.tech/topics/legacy-systems.md>), [data](<https://devfeed.tech/topics/data.md>), [Processes](<https://devfeed.tech/topics/processes.md>)

Tags: [agentic-ai](<https://devfeed.tech/tags/agentic-ai.md>), [agents](<https://devfeed.tech/tags/agents.md>), [ai-agents](<https://devfeed.tech/tags/ai-agents.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [data](<https://devfeed.tech/tags/data.md>), [governance](<https://devfeed.tech/tags/governance.md>), [integration](<https://devfeed.tech/tags/integration.md>), [legacy](<https://devfeed.tech/tags/legacy.md>), [legacy-modernisation](<https://devfeed.tech/tags/legacy-modernisation.md>), [operational-risk](<https://devfeed.tech/tags/operational-risk.md>), [processes](<https://devfeed.tech/tags/processes.md>), [risk-management](<https://devfeed.tech/tags/risk-management.md>)

### AI overview

The article argues that organisations must address fragmented data, brittle processes, and outdated architectures before they can realise the full value of agentic AI. It explains that legacy systems may remain operationally critical, while accumulated technical, process, and organisational debt can prevent agents from accessing reliable information and executing workflows consistently.

### Source excerpt

Organisations are increasingly excited by the potential of agentic AI, but many overlook the legacy obstacles that stand in the way. In this post, I explore why successful AI adoption depends on tackling fragmented data, brittle processes and outdated architectures, and why modernisation is often the most important step towards unlocking value from intelligent agents.

## Strategies for Migrating from a Monolith to Microservices

DevFeed: [Strategies for Migrating from a Monolith to Microservices](<https://devfeed.tech/articles/monolith-to-service-architecture-34687.md>)

Original publisher: [Read original article](<https://newsletter.systemdesigncodex.com/p/monolith-to-service-architecture>)

Author: Saurabh Dashora

Published: 2026-06-23T07:55:12Z

Content type: tutorial

Language: en

Sources: [System Design Codex](<https://devfeed.tech/sources/system-design-codex.md>)

Topics: [Architecture & Design](<https://devfeed.tech/topics/architecture-design.md>), [microservices architecture](<https://devfeed.tech/topics/microservices-architecture.md>), [migration](<https://devfeed.tech/topics/migration.md>), [legacy systems](<https://devfeed.tech/topics/legacy-systems.md>), [gateway](<https://devfeed.tech/topics/gateway.md>)

Tags: [api-gateway](<https://devfeed.tech/tags/api-gateway.md>), [architecture](<https://devfeed.tech/tags/architecture.md>), [automated](<https://devfeed.tech/tags/automated.md>), [big-bang](<https://devfeed.tech/tags/big-bang.md>), [feature-flags](<https://devfeed.tech/tags/feature-flags.md>), [incremental](<https://devfeed.tech/tags/incremental.md>), [legacy-systems](<https://devfeed.tech/tags/legacy-systems.md>), [microservices](<https://devfeed.tech/tags/microservices.md>), [migration](<https://devfeed.tech/tags/migration.md>), [monolith](<https://devfeed.tech/tags/monolith.md>), [parallel](<https://devfeed.tech/tags/parallel.md>), [rewrite](<https://devfeed.tech/tags/rewrite.md>), [strategies](<https://devfeed.tech/tags/strategies.md>), [testing](<https://devfeed.tech/tags/testing.md>)

### AI overview

This tutorial outlines patterns for gradually moving from a monolithic architecture to microservices. It describes the Strangler Fig Pattern, Parallel Run Pattern, and Collaborator Pattern, covering techniques such as API gateways, incremental migration, traffic splitting, feature flags, and automated comparison testing.

### Source excerpt

Top Strategies

## Strategies for Moving from a Monolith to Microservices

DevFeed: [Strategies for Moving from a Monolith to Microservices](<https://devfeed.tech/articles/how-to-move-from-monolith-to-a-service-based-architecture-34682.md>)

Original publisher: [Read original article](<https://newsletter.systemdesigncodex.com/p/how-to-move-from-monolith-to-a-service>)

Author: Saurabh Dashora

Published: 2026-05-26T07:58:51Z

Content type: tutorial

Language: en

Sources: [System Design Codex](<https://devfeed.tech/sources/system-design-codex.md>)

Topics: [microservices architecture](<https://devfeed.tech/topics/microservices-architecture.md>), [migration](<https://devfeed.tech/topics/migration.md>), [legacy systems](<https://devfeed.tech/topics/legacy-systems.md>), [proxy](<https://devfeed.tech/topics/proxy.md>)

Tags: [architecture](<https://devfeed.tech/tags/architecture.md>), [big-bang](<https://devfeed.tech/tags/big-bang.md>), [feature-flags](<https://devfeed.tech/tags/feature-flags.md>), [incremental](<https://devfeed.tech/tags/incremental.md>), [monolith](<https://devfeed.tech/tags/monolith.md>)

### AI overview

This tutorial describes patterns for gradually moving from a monolithic architecture to microservices. It covers the Strangler Fig Pattern, Parallel Run Pattern, and Collaborator Pattern in the supplied text, emphasizing incremental migration, traffic splitting, behavior comparison, feature flags, and reduced rewrite risk.

### Source excerpt

Strategies worth knowing

## A quiz matches developers with Replay '26 conference sessions

DevFeed: [A quiz matches developers with Replay '26 conference sessions](<https://devfeed.tech/articles/what-replay-explorer-are-you-take-this-quiz-to-find-out-36103.md>)

Original publisher: [Read original article](<https://temporal.io/blog/what-replay-explorer-are-you-take-this-quiz-to-find-out>)

Author: Lauren Bennett

Published: 2026-04-07T00:00:00Z

Content type: opinion

Language: en

Sources: [Temporal Blog](<https://devfeed.tech/sources/temporal-blog.md>)

Topics: [legacy systems](<https://devfeed.tech/topics/legacy-systems.md>), [AI Agent](<https://devfeed.tech/topics/ai-agent.md>), [migration](<https://devfeed.tech/topics/migration.md>), [reliability](<https://devfeed.tech/topics/reliability.md>)

Tags: [ai-agents](<https://devfeed.tech/tags/ai-agents.md>), [community](<https://devfeed.tech/tags/community.md>), [legacy-systems](<https://devfeed.tech/tags/legacy-systems.md>), [migration](<https://devfeed.tech/tags/migration.md>), [opinions](<https://devfeed.tech/tags/opinions.md>), [reliability](<https://devfeed.tech/tags/reliability.md>)

### AI overview

This interactive quiz assigns developers a Replay '26 conference path based on their work and interests, including legacy-system modernization, AI workflows, reliability, migration, and architecture.

### Source excerpt

Are you migrating haunted legacy systems, wrangling AI agents with opinions, or quietly keeping everything from falling apart? Take the quiz to find your Replay '26 path.