// solutions - legacy modernisation

Legacy migrations.
Automated.

Stop stretching sprints across quarters to handle framework upgrades. Bosun workflows map your codebase, write the tests, execute the migrations and open the PRs. Your engineers receive detailed reports and evidence to confidently approve.

Calculate your ROI → See how it works
15×
Faster than
manual migration
40+
Languages &
runtimes supported
90%
Production-ready
on first PR
<1%
Regression rate
on migrated code
// what bosun migrates

We've seen
it before.

Real codebases. Real constraints. Bosun has navigated the complexity that makes engineering teams hesitant to even start.

E-commerce
Small company
→
Shopify Templates Tamed
Wild growth of Shopify templates was making every new feature deployment a regression risk. Bosun mapped the template sprawl, introduced structure, and enabled the team to ship features confidently without breaking existing storefronts.
Compliance
Enterprise acquisition
→
AngularJS → VueJS
A company acquired by a large corporate needed to meet strict enterprise compliance requirements. A Bosun workflow was able to extract features from their 15-year-old AngularJS monolith, modularising, modernising, and porting them to VueJS while adhering to style and code quality standards.
Security
Two mid-sized companies
→
PHP & Laravel Upgrades
Outdated PHP dependencies were creating active security exposure. Bosun upgraded and now maintains their dependency chains, including complex Laravel major version migrations, so they are no longer running vulnerable software in production.
Onboarding
Large enterprise
→
Living Documentation
A very large and old codebase with no documentation was slowing every new hire to a crawl. Bosun established and now maintains up-to-date documentation across the entire codebase, letting the team onboard new developers in days, not months.
// introducing bosun

Migrate and transform
your legacy code.
And automate the rest.

Introducing Bosun - Migrate and transform your legacy code, and automate the rest
Introducing Bosun - Migrate and transform your legacy code
// how bosun migrates

Surgical.
Not a rewrite.

Bosun works at the AST level. It understands your code semantically, not as text. That's how it generates migrations that pass CI the first time.

01
Deep codebase scan
Bosun maps every file, every import, every dependency. It builds a semantic graph of your codebase before touching a single line.
02
Migration plan generation
A detailed plan is generated, ordered by risk and blast radius. Breaking changes are flagged. Test coverage gaps are identified upfront.
03
AST-level transformation
Each file is transformed at the syntax tree level. Not regex substitution. The output is idiomatic, reviewable, and passes your linters.
04
Tests written alongside
For every migrated module, Bosun writes or updates tests. Legacy code without coverage? Bosun writes those first so the migration has a safety net.
05
PR opened with full context
Each PR includes: what was changed, why, what the risk profile is, and what tests were added or updated. Engineers review, not hunt.
// why bosun vs alternatives

No hand-holding.
No hand-coding.

Manual migration
Engineers do it themselves
✕Months of sprint capacity consumed
✕Regressions caught late or not at all
✕Engineers context-switch from product work
✕No test coverage on legacy paths
✕Documentation never updated
✕Tribal knowledge bottleneck
Generic AI tools
Copilot, ChatGPT, etc.
△File-by-file, no cross-repo awareness
△Hallucinated diffs that don't compile
△No CI validation, engineer still runs it
✕Generated tests still need manual verification
✕No migration plan or risk analysis
△Still requires significant eng time
Bosun
Automated, end-to-end
✓Org-wide scan in minutes
✓AST-level with no hallucinated diffs
✓CI passes on first PR, every time
✓Tests written alongside every change
✓Ordered migration plan with risk scores
✓Engineers review, not execute
// supported stacks

40+ languages
& frameworks.

Python 2 → 3 React class → hooks Node 16 → 22 Java 8 → 21 AngularJS → Angular Vue 2 → 3 Ruby 2 → 3 Rails 5 → 7 Django 3 → 5 Spring Boot 2 → 3 PHP 7 → 8 TypeScript strict mode Webpack → Vite Jest → Vitest Enzyme → RTL Moment.js → date-fns CommonJS → ESM Redux → Zustand GraphQL schema upgrades gRPC proto migrations Kubernetes API upgrades Terraform 0.x → 1.x MySQL 5 → 8 PostgreSQL upgrades + custom migrations
Stop deferring
your tech debt.

Bosun turns a 6-month migration backlog into a series of reviewed PRs. Your engineers stay on product. The debt gets cleared.

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