Symfony Support and Maintenance

Long-term care for Symfony applications — whichever version yours was left on.

symfony support

Your Symfony app outlived the team that built it

Symfony applications are built to last, and they do — often longer than the developers who wrote them. What is left is a system the business depends on daily, a framework version a few releases behind, a few hundred lines nobody understands any more, and no one accountable when something breaks at the worst possible moment.

Synapse Code supports existing Symfony applications as a long-term technical partner. We learn the codebase once, write down how it actually works, and stay responsible for it: bug fixes, security patches, Doctrine and database performance, bundle and framework upgrades, integrations, and the features the business keeps asking for. Symfony is not a side skill here — we maintain Symfony systems for clients, we modernise them, and this website runs on Symfony too.

If the application has been fully orphaned — no documentation, no handover, no repository — start with application takeover. If you are not sure which framework you are on, our general PHP application maintenance covers the same ground.

Symfony 1 → Symfony 8

We keep a Symfony 1 / PHP 5.4 website safely in business, and build on current Symfony — including this site.

Zero downtime at peak

A Symfony events platform we maintain has ridden out its peak ticket campaigns without downtime — and launched in a second country on the same core.

20+ REST endpoints

Exposed on a Symfony 3.4 monolith so a React frontend could replace the old interface — with no interruption to live bookings.

scope

what Symfony support covers

Day-to-day maintenance

Bug fixes, security patches, Messenger and cron reliability, incident response, and the small changes the business needs this week.

Legacy Symfony

Symfony 1, 2.x and 3.4 codebases with older dependency-injection and routing patterns — supported as they are, carefully, without a rewrite-by-default.

Symfony & PHP upgrades

Staged framework, bundle and PHP version moves in production-safe steps — see framework and PHP upgrades.

Doctrine & performance

N+1 queries, missing indexes, slow reporting dashboards, caching and MySQL or PostgreSQL health — measured against real traffic, then fixed.

APIs & integrations

REST APIs on existing business logic, message queues, and links to ERP, e-commerce and payment systems — see development and integrations.

Deploys & environments

Docker, CI/CD, staging that mirrors production, backups and environment hygiene — so releases are boring and recovery is possible.

whichever version you are on

no Symfony is too old

1

Symfony 1

A stack most agencies refuse to touch. We maintain one on PHP 5.4 — SEO and content updates, property feeds, cache faults traced to root cause, and production brought back under Git control.

2

Symfony 2 & 3.4

Twig-and-jQuery monoliths carrying the whole business. We keep them running, and open them up — an API layer on Symfony 3.4 let a React frontend replace the old interface without a rewrite.

3

Symfony 4 & 5

Out of support and drifting. Typically the best candidates for a staged upgrade once the urgent risks are dealt with — usually alongside a PHP version move.

4

Symfony 6, 7 & 8

Current systems that need someone accountable: feature work, performance, integrations and upkeep. This website runs on Symfony 8 and PHP 8.4.

FAQs

Symfony support questions

From Symfony 1 to current Symfony. We maintain a Symfony 1 / PHP 5.4 website that still earns its keep, we built a REST API on a Symfony 3.4 monolith, and this site runs on Symfony 8. An old version is a reason to talk to us, not a reason we will decline.

Yes — it is normal work for us. We audit access and code, reconstruct how the system actually works, stabilise anything urgent, then take ongoing responsibility. The previous developer does not need to be available; we have rebuilt the picture from what was running on the production server. See application takeover.

No. We support the version you are on today. Once the application is stable we usually propose a staged upgrade path — version by version, in production-safe steps — so you stop accumulating security and compatibility risk. Upgrading is a decision, not a precondition.

Usually, yes. On a Symfony 3.4 events platform we exposed the existing business logic through 20+ REST endpoints so a React frontend could replace the Twig interface — no interruption to live bookings, at a fraction of the cost of re-platforming. On a legacy PHP integration we replaced the code gradually with Symfony middleware while the stores kept selling. That is the approach behind our modernisation work.

A monthly retainer sized to your application and how fast it changes, agreed after the System Risk Check. Upgrades, integrations and new modules run as time-and-materials projects alongside it, estimated up front — see how pricing works and How We Work.

Not the question you had? Our full FAQ covers how engagements start, scale and end.

testimonials

customer testimonials

We engaged them to modernize a legacy internal application, and within months, they delivered a solution that exceeded our requirements on every front. What stood out most was their ability to balance speed with sustainability—they delivered results on a tight timeline without cutting corners. Synapse Code is simply the best external partner we've worked with. We're already mapping out our next development phase.

John Hryshchuk

CEO at Advanced Ultrasound Systems

First Slide

Valentyn and his team helped us build a flexible backend system to manage training sessions, client materials, and participant feedback. What stood out was their ability to translate our needs into a clean, functional platform. Their calm, clear communication and dependable delivery made the whole process feel effortless. And, Valentyn himself, is a thoughtful leader with incredible skills. 10 out of 10 would recommend!

Douglas Brewer

founder

First Slide

We worked with Valentyn’s team on integrating our AI automation platform with several third-party services via custom APIs. They quickly understood the technical requirements and delivered a clean, well-documented solution that worked out of the box. Their work helped us reduce onboarding time for new clients and made our system much easier to scale. Great communication, fast iterations, and no surprises - highly recommended!

Andrii Nasadchuk

CEO at Aimeice Tech

First Slide

I worked with Valentyn on a custom web application and it was a great experience. He quickly understood our needs, was deeply involved in the project, and delivered a clear and well-structured solution. Everything went smoothly from start to finish. Highly recommended.

Pilar Bordonado

Head of Commercial Operations in Calidad Pascual

We had the pleasure of working with Valentyn Morozov during the implementation of our Electronic Case Report Form (E-CRF) system. From the initial E-CRF setup to troubleshooting technical issues and implementing changes as our requirements evolved, he was always responsive, knowledgeable, and focused on finding the right solution. I highly recommend Valentyn to anyone looking for a knowledgeable, reliable, and committed IT professional.

Kakhaber Zaalishvili

Country Manager Ukraine at Audubon Bioscience

Working with Valentyn has been a game-changer for us at AUS. We brought him and his team in to transition from our legacy internal app to a new platform, and they exceeded our expectations on every front—delivering in just a few months. Valentyn brings a rare combination of deep technical expertise and strong business acumen. His solutions are smart, practical, and built to last, with a clear focus on quality and sustainability.

Victoria Kurashkina

Marketing at Advanced Ultrasound Systems

I've worked with Valentyn and the Synapse Code team on transforming an early low-code prototype into a production-ready, multi-tenant SaaS platform. They took ownership of the technical complexity across the backend, frontend, infrastructure, AI workflows, and third-party integrations, replacing a fragile setup with a reliable Symfony, React, and AWS foundation. What I particularly value is that Valentyn approaches the work as a long-term technical partner, not simply as someone completing individual tickets.

Eduardo Cifre Sanchez

Founder at Ranking Superior

system risk check

Get a Symfony System Risk Check

We review your Symfony application — code, bundles, Doctrine and database, jobs, hosting and deploys — and send you a written report of risks and quick wins. Then you decide what happens next.

Request a System Risk Check