Legacy Modernization
for reliable software delivery.

You're stuck in legacy code — slow delivery, constant bugs, and nothing your team has tried has fixed it. Adding AI on top only made delivery worse. You're the one who wants to drive the change — you care about getting it right; what's missing isn't the will, it's the how. And that's exactly what Optivem Circle gives you — working through the real problems you're facing, alongside other engineers doing the same.

Live calls + 24/7 async access
Bring your real challenges
No curriculum, no slides — live guidance on the real problems you're hitting. Queue your questions ahead or raise them live, plus async Q&A 24/7 between calls.
Whatever your situation needs
Legacy Modernization, Architecture Redesign, ATDD/TDD, HA/CA/DDD, CI/CD, AI — or something off this list entirely. No topic is out of scope.
Belong with engineers who care
You're not the only one who sees it. Circle is a community of senior engineers who care about software quality, won't settle for the status quo, and want to make a real impact — working through the same hard problems together.
Fortnightly · 2-hour sessions
Live, generally 3–5pm CET/CEST (9–11am ET) — every session recorded, replays available. Cadence may adapt over time.
The Problem

You've tried everything.
The legacy code won't budge.

Working in legacy code is relentless pressure — stressful deliveries, slipping deadlines, and fresh bugs every time you touch code no one fully understands.

You're pushed to deliver faster — and can't

Every change to the legacy core feels like defusing a bomb — no tests, no safety net, no fast feedback. So you lose hours to manual checking, and shipping brings dread instead of relief. The business wants things faster; the code gives you slipping deadlines and fresh bugs every time you touch it.

You tried applying the books — too many gaps

Textbook examples are clean. Your production codebase is not — and the gaps are everywhere, each one specific to your situation in ways no book covers. You've even tried things yourself, and watched a half-applied refactor or a brittle new test suite leave it worse than before — and your colleagues, watching it fail, walked away convinced the whole approach just "doesn't work."

AI churns out code faster — with more bugs

It generates code that semi-works — plausible, not correct. AI sped up writing code, but writing was never the bottleneck; testing was. So it just ships the wrong code faster, and you've become the human regression suite: seniority spent reviewing a firehose of AI PRs juniors can't defend.

AI wrote it — now no one can maintain it

And the code it generates isn't built to be maintained, with no one on the team really understanding it — so the only way to change it is to hand it back to the AI. Every pass burns more tokens, and your grip on your own system slips further. You're not building capability; you're building dependence.

You see the cliff. Everyone else sees speed.

Plausible-but-wrong code piles up faster than anyone understands it — but "AI writes the code now" has become the reason to stop worrying about tests and design. Pushing for quality reads as slow and old-fashioned, and the people you'd have rallied are the ones cheering the speed. You're the only one who seems to see it.

And you're the one trying to change it. But wanting it was never the hard part — knowing how to make it stick is.

The Other Side

Reliable software
delivery. With AI too.

Imagine six months from now:

What You Get

Practical guidance,
live and async.

No curriculum. No slides. Q&A on what you're actually working on — live on the calls and async between them. Advisory support for engineers already doing the work.

Live guidance, every two weeks

A 2-hour live session every two weeks. Bring the real challenges from your work — queue your questions ahead and they're scheduled to be talked through at the next session, or raise them live. It's a real discussion about your situation, not generic advice — we work through your specific case together. Code examples where available.

Ask questions anytime

Hit a wall the day after a call? Post it async and get it answered in the open — and every answer compounds into a library you can search.

Both the live calls and the async threads run in the open — so proprietary code stays off them. That's what Teams is for.

Some of what you're hitting, you've solved before. Some of it you haven't — and that's the point. Bring the real problem, talk through the approaches with someone who's worked them, and leave with a recommendation you can act on. We go as deep as the question needs — no rushing to move on for the sake of it — and if a follow-up comes up after the session, that gets worked through too: pick it back up on the next call, or async in between.

That's what Optivem Circle is for.

Who It's For

Built for anyone serious about
legacy modernization.

Optivem Circle is built first for senior engineers and tech leads hands-on in a legacy codebase and pushing to make it better. But the same problems land on a wider set of roles — and whatever your title, if you're driving legacy modernization, you're who this is for:

And really — anyone serious about modernizing legacy code.

No Syllabus

The kinds of things
members bring.

There's no curriculum — you bring what's blocking you. A course fixes its scope up front, but legacy code never respects a syllabus; here the scope is unlimited, so whatever's actually blocking you is on the table — including the big stuff like architecture, refactoring, and legacy modernization. A few examples of the kind of thing:

"Every time we touch a class, a pile of unit tests break and we have to stop and fix them. How do I get the team testing behaviour, not implementation?"
"Our pipeline kept failing, so we disabled the broken tests — and now nobody updates them. How do I get back to a CI we can trust?"
"Copilot writes code that passes review and breaks in prod. How do I put a safety net under AI-generated code?"
"The AI needs half the repo in context to change anything, and still gets it wrong. Does cleaning up the architecture make it work better?"
"We need to break a 200k-line monolith into services without a full rewrite. What's a safe incremental path that keeps delivery going?"
"How do I introduce ATDD on a team that's burned out and skeptical of 'yet another process'?"

Bring yours.

Membership

Choose your plan.

Start here
Individual Membership

Optivem Circle

A standing line to senior guidance on the legacy code you're up against.

€1,164 €930 / yr

Save 20% · about €77.50/mo, billed yearly

Join Annual
  • Live guidance calls every two weeks
  • Your real challenges talked through — examples where available
  • Ask questions async between calls — 24/7 in the community
  • Full replay access
  • Unlimited topic scope
  • A community of senior engineers who care about the craft
Group Membership

Bringing a team?

Everything in the membership, on the shared public calls — put your whole team on one invoice and expense it once, instead of each engineer signing up and claiming it back. A volume discount grows with headcount.

Volume discount (annual plans)

On top of the annual per-seat price


  • 3–4 seats10% off
  • 5–9 seats15% off
  • 10+ seats20% off
Book a Call to Discuss

All plans billed in advance · cancel anytime — access continues to the end of the period you've paid for. Plus a 30-day money-back guarantee: not 100% satisfied in your first month? Full refund, no questions asked.

Expensing it? We make it easy.

Whether it's a single seat or a whole team's invoice, this can be a work expense rather than an out-of-pocket cost — an invoice (company name + VAT) is available on request to claim from an L&D / training budget. Here's a ready-to-send manager email and the invoice details →

Bringing your team but need to work on your own codebase — privately?

That's Optivem Teams: dedicated sessions reserved for your engineers alone, on your real, proprietary code, in full confidence. The one option that works on your code, not open-source examples.

About Your Coach

Valentina
Jemuović

Technical Coach at Optivem. Years spent helping engineering teams modernize legacy systems without years of expensive trial and error.

"Teams aren't stuck for lack of theory. They're stuck because no one's shown them how to apply it to real, legacy code."

Creator of the ATDD Accelerator, putting Agentic AI to work inside the loop to ship changes to legacy code more safely and faster. Optivem Circle brings that same guidance to any engineer fighting through it.

TDD ATDD CI/CD Hexagonal Architecture Clean Architecture Legacy Code
Valentina Jemuović, founder of Optivem
FAQ

Common questions.

General
Do I need to have completed an Optivem course to join?
No — open to any senior engineer or tech lead actively working on legacy code modernization. Prior course experience is helpful but not required.
What topics are covered on the calls?
Whatever you're working on. TDD, ATDD, CI/CD, Hexagonal Architecture, Clean Architecture, legacy code, AI — driven by your real questions, not a fixed curriculum.
Will you write the code or build it with me?
No — coaching is advisory. You bring your real challenges to the calls and we work through the approach together, but the implementation stays in your hands between sessions. It's guidance on your work, not a build-it-with-you (or build-it-for-you) service.
Are results guaranteed?
Coaching is advisory guidance, not a guaranteed outcome — we give you the clearest, most practical direction we can, but the results come from the work you do between sessions and the decisions you make. We're confident enough in the value that every membership is backed by a 30-day money-back guarantee: if it's not the right fit, get a full refund within your first month.
Is guidance live or async?
Both. Guidance is delivered live on the calls every two weeks, and you can also ask questions async between sessions — answered in the community so everyone learns from the answer. Every public session is recorded, so over time you build up a library you can revisit anytime while your membership is active. (Async question-answering is on every plan.)
How many sessions are there, and how do I get my questions answered?
Right now we run a fortnightly 2-hour live session — that's the current schedule, and it may adapt over time. You can queue your questions ahead of the call or raise them live on the day — plus ask async in the community between calls. Sessions are demand-driven: a scheduled call runs as long as someone has registered for it and/or submitted a question in advance — so to make sure a session happens, just register or drop your question in beforehand. A slot with no registrations and no questions at all simply isn't held. And when questions are heavy and we're regularly running over the 2 hours, we may add extra session slots to get through them — so the schedule flexes to fit the room either way.
What if I have follow-up questions?
Bring them to the next call. Most real problems take a few passes — you try the next step, hit something new, and we pick it up from there. Between calls you can post follow-ups to be answered in the open, so the thread keeps moving and everyone learns from it. Progress comes from a little direction applied call after call, not from one perfect answer.
When are the calls scheduled?
Sessions are held every two weeks and run about 2 hours, with dates and times announced in advance. They generally run 3–5pm CET/CEST (9–11am ET), though exact timing varies. The Technical Coach reserves the right to reschedule a call to a different day or time, and you'll be notified in advance. Public sessions are recorded in full with replay access always included (by joining a public call you consent to being recorded); for Private (Teams), recording is your team's choice — so even if a new time doesn't suit you, you keep full replay access.
What if I can't make the live calls?
All calls are recorded. You'll have full replay access — watch at your own pace, on your schedule.
Can I cancel anytime?
Yes — any plan can be cancelled anytime, whether monthly, annual, or Teams. Billing is always in advance, so access continues until the end of the period you've already paid for — the rest of the month on a monthly plan, or the rest of the year on an annual one — and you're simply not charged for the next one.
Can I pause my membership?
There's no separate pause — and you don't need one. Since every plan is billed in advance and cancels anytime with no penalty, you can simply cancel and rejoin whenever you're ready. Just note that replay access to recorded sessions is part of an active membership: it's available while you're a member and returns when you rejoin.
Is there a money-back guarantee?
Yes — every membership, individual or Teams, comes with a 30-day money-back guarantee. If it's not the right fit, request a full refund within your first month, no questions asked.
What's the difference between monthly and annual?
Nothing in what you get — same calls, same async Q&A in the community, same full replay access, same unlimited scope. The only difference is billing: pay monthly, or pay yearly and save 20%. Either way you can cancel anytime.
What if my company won't cover it?
There are two ways to fund Circle, and each pays back differently. Expense it — what the company gets: faster, more predictable delivery, fewer production bugs, a team that can modernize the legacy code instead of working around it, and AI used with a safety net rather than as a liability. An invoice (company name + VAT) is available on request, plus a ready-to-send manager email, clean to claim from a training budget — here's how to expense it. Fund it yourself — what you get: skills that genuinely move legacy code are some of the best career insurance there is — the market rewards engineers who can do what most can't, and you don't have to wait for anyone's sign-off to start building them.
Can I enrol several engineers from my company?
Yes. There's a per-seat group discount that grows with the team, stacked on the annual per-seat rate — see the Group plan for the seat tiers. Everyone joins the same shared public calls, you can request an invoice to expense (company name + VAT number), and an annual term is optional. Book a call and we'll set it up. (Need dedicated calls on your own private codebase instead? That's Optivem Teamsteams.optivem.com.)
Circle vs Teams
What's the difference between Circle and Teams?
Circle runs as open public calls alongside engineers from other companies, working through the approach together — any code shown is open-source or freely available, never proprietary. Optivem Teams is exclusively for your team: dedicated calls, no outside attendees, where you get advice on your company's real, proprietary codebase in full confidence. Teams now lives on its own page → teams.optivem.com.
Can I work on my company's private code?
Not on public Circle calls — those use open-source / freely-available code, so nothing confidential leaves the room and no NDA is needed. For your real proprietary codebase, that's Optivem Teams: dedicated calls for your team alone, in full confidence → teams.optivem.com.
Get Started

Ready to make
an impact?

Practical, live guidance for the legacy code you're up against — every two weeks.