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Tetra Connects

Services

Legacy modernization

Legacy systems keep running because they work. Modernization is about reducing the cost and risk of keeping them, without a risky big-bang replacement.

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What organizations bring us

The usual story: the system is critical, the original developers have left, documentation is thin and every change is risky. Replacing it all at once rarely works, because the old system hides business rules that nobody remembers.

We start by discovering what the system actually does, using code analysis, data analysis and interviews. Then we choose an approach per component, often the strangler pattern, where new functionality grows around the old system and takes over piece by piece.

What the platform covers

  • Application assessment

    Inventory, dependencies, code quality, risk and business value to decide disposition.

  • Rehost and replatform

    Move to cloud or new runtimes with minimal code change.

  • Refactor and re-architect

    Break apart monoliths, introduce APIs and modern frameworks.

  • Replace

    Move to a packaged product or platform, with data migration and process change.

  • Database modernization

    Move from legacy databases and stored procedure logic to modern platforms.

  • Mainframe and midrange

    Assessment and migration planning for COBOL, RPG and other legacy workloads.

A common approach

  1. 1

    Discover behavior

    Reverse-engineer business rules from code, data and users.

  2. 2

    Disposition

    Decide per application: retain, rehost, replatform, refactor, replace or retire.

  3. 3

    Design the seam

    Define interfaces so old and new systems can coexist.

  4. 4

    Migrate in slices

    Move functionality and data in controlled increments.

  5. 5

    Verify equivalence

    Run old and new in parallel, comparing outputs.

  6. 6

    Retire

    Switch off the old system once the business confirms equivalence.

What you receive

  • Application portfolio assessment
  • Disposition recommendations
  • Target architecture and seams
  • Migration plan in slices
  • Parallel-run test plan
  • Decommissioning plan

Questions people ask

Should we rewrite or modernize incrementally?

Usually incrementally. Complete rewrites tend to fall behind a moving business. We evaluate the specific system before recommending.

Can you work with technologies that few people know?

We tell you at assessment if the skills exist. For specialized legacy stacks, we can source contractors with the specific experience.

Related

  • Software engineering

    Custom applications, APIs, modernization, quality engineering and support, delivered by teams or placed as specialists.

  • Cloud

    Cloud strategy, readiness assessments, migration, landing zones, governance, FinOps and operations on AWS, Azure and Google Cloud.

  • Data migration

    Plan, extract, cleanse, map, load and reconcile data between systems, with business owners signing off every object.

Have a technology challenge? Let’s work out the approach.

Discuss a project

Tell us the current system, the target and the timeline. A technical lead replies to talk about scope.

Start the project brief

Request technical talent

Need consultants inside your team rather than a project owner? Send the requirement.

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Phone, United States (470) 948-0356 Phone, India +91 70321 51545 Email info@tetraconnects.com