Who can take over maintenance and further development of our existing web platform in the US? That's the question this guide answers.
Maybe your original agency stopped answering emails. Maybe the freelancer who built the platform took a full-time job. Or maybe your in-house developer left, and now nobody knows how deployments work. The web app still runs your business, but every week it gets a little older, a little less secure, and a little harder to change.
Here's the thing: you don't have to start over. Most live web platforms can be handed to a new team, cleaned up, and kept growing. But taking over someone else's code is a different job from building a new product. The team needs to read unfamiliar code, keep the app running while they learn it, and still ship new features on a predictable schedule.
This guide covers the signs it's time to switch teams, the top agencies in the US that do takeover work, what a good handover looks like, and what it costs.
Signs It's Time to Hand Your Web App to a New Team
You probably don't need a new team because of one bad week. But watch for these patterns:
- Nobody owns the code anymore. The person who built it is gone, and the knowledge left with them.
- Small changes take weeks. A new form field or a pricing update turns into a long project.
- Framework and library versions are years old. Old PHP, Node, Rails, or Angular versions stop getting security patches.
- Bugs keep coming back. Fixes break other parts of the app, which usually means there are few or no automated tests.
- Your vendor can't scale with you. You need more developers or new skills, and your current team can't provide them.
- You can't see what's happening. No clear reports, no roadmap, no idea what you're paying for each month.
If two or more of these sound familiar, start talking to new teams now. A takeover is easier when the app is still running and the old vendor is still reachable.
Top Software Development Agencies for Taking Over Web App Maintenance & Development in the US
The top software development companies specializing in taking over existing web app maintenance and development include IT Craft, Saritasa, thoughtbot, Planet Argon, Atomic Object, and Kanda Software. Here is a comparison of them:
1. IT Craft
Founded in 2001, IT Craft has completed more than 2,250 projects with a team of 330+ engineers, and a large share of its work starts in code someone else wrote. For US companies that need a partner to take over maintenance and further development of an existing web management platform, that track record with inherited products is what puts the firm first on this list.
Amesto is the clearest example. Its previous vendor couldn't supply the specialists the product needed, so IT Craft assumed the project within ten days, moved it off Silex, a framework that hit end of life in 2018, and kept releasing features while the client's operations carried on as usual. The updated system went live less than seven months after the handover. Adorama shows the longer view. On the US photo and video retailer's custom e-commerce platform, which handles sales, rentals, inventory and complex pricing, IT Craft scaled its team from 5 to more than 50 specialists, and pages render in under three seconds with near-constant uptime during peak shopping events.
For a buyer replacing a vendor, the takeaway is practical: the handover period is short, and the same firm can add people as the backlog grows, so there's no need for a second switch a year later.
IT Craft holds a 4.9 overall rating on Clutch (checked October 2026). The co-founder of Fortress Cyber, a cybersecurity firm that has kept IT Craft on ongoing DevOps managed services since February 2020, summed up the team in his Clutch review: "They're top AWS gurus."
Best for: US product owners whose web platform was left behind by an agency, freelancer or in-house developer and who need one team to take it over, keep it stable and keep shipping new features.
2. Saritasa
Saritasa is a US company with offices in Irvine, California, and Tampa, Florida. It runs a dedicated rescue and takeover service for code inherited from previous vendors. One Clutch reviewer, a nutritional drink company, hired Saritasa to maintain its website and build new features after the code had already passed through two other agencies. Saritasa had to get up to speed fast and keep the site working for the full 12-month engagement.
Services & expertise: code takeover, source code review, refactoring, legacy upgrades, ongoing maintenance, and new feature development.
Strengths: a specific takeover service for inherited code, an in-house US team, and clear project management that reviewers often mention.
3. thoughtbot
thoughtbot has been helping product teams for more than 20 years and is one of the best-known Ruby on Rails shops in the world. It runs a part-time support and maintenance team for apps that don't need full-time developers but can't be left alone. You always get at least two team members who know your codebase, so you're never stuck if one person is out. The team works within a set monthly budget and reports on progress at the end of each week.
Services & expertise: application support and maintenance, Rails upgrades, code audits, automated testing, ongoing feature development, and compliance support (HIPAA, GDPR, CCPA, ADA).
Strengths: deep Rails expertise, built-in redundancy with two people on every codebase, and predictable monthly budgets.
One honest note: some Clutch reviewers say thoughtbot sits at the higher end of the price range.
4. Planet Argon
Planet Argon is a Portland, Oregon agency founded in 2002. It has narrowed its focus to one thing: keeping existing Ruby on Rails apps stable and maintainable. It has inherited Rails apps from other agencies, freelancers, and former in-house developers for over a decade. On Clutch, one client says Planet Argon took over its Rails platform for artist training and now handles maintenance and further development. Another, a wine retailer, had its site restored within 48 hours after an outage.
Services & expertise: a monthly maintenance retainer, emergency Rails support, Rails upgrades, front-end improvements, and safe app retirement when that's the right call.
Strengths: a focus on existing Rails apps rather than new builds, emergency support for outages, and flexible retainers for small teams.
5. Atomic Object
Atomic Object is an employee-owned company founded in 2001, with a 100% US-based team and offices in Ann Arbor, Chicago, Grand Rapids, and Raleigh. Besides new products, it enhances existing products and modernizes legacy ones. Clutch reviews include ongoing maintenance and improvement of a university's Django software and updates to a childcare tech company's existing Laravel app.
Services & expertise: enhancements to existing software, legacy modernization, maintenance and support, UX/UI design, and AI integration.
Strengths: a fully US-based, employee-owned team, experience working inside other teams' code across several stacks, and strong reviews for clear communication.
6. Kanda Software
Kanda Software is based in Newton, Massachusetts, with 250–999 employees and more than 30 years of experience modernizing legacy systems. Its maintenance service covers all four types of maintenance: fixing bugs, adding features, improving performance, and preventing problems before they happen. Kanda also takes on technology most firms avoid. It agreed to support Decision Management Solutions' product built on Microsoft Silverlight, while planning a move to a modern stack.
Services & expertise: corrective, adaptive, perfective, and preventive maintenance, 24/7 application and server monitoring, legacy support and reengineering, and cloud migration.
Strengths: comfort with very old technology, 24/7 monitoring, and fast knowledge transfer into existing support processes.
Here's the honest take on this list: there's no single "best" agency for every web app. If your platform runs on Rails, thoughtbot and Planet Argon know that world inside out. If you want a fully US-based team, Atomic Object fits. Kanda makes sense for older enterprise systems. Saritasa has a dedicated service for inherited code. And IT Craft is a good fit if you want one team that takes over fast, works across stacks, and stays on for long-term maintenance and new features.
What a Good Takeover Looks Like
Every agency names its steps a little differently. But a solid handover usually follows the same path.
- Secure access first. Before anything else, make sure your company owns the code repository, hosting and cloud accounts, domain, database backups, and third-party API keys. If the old vendor holds any of these, get them transferred now.
- Audit the code. The new team reviews code quality, architecture, framework versions, security, test coverage, and whether the app can be redeployed from source. You should get a written report, not a vague summary.
- Transfer knowledge. If the previous team is still reachable, set up a few handover calls. Even a couple of hours with the old developers can save weeks.
- Stabilize. Critical bugs, security patches, and outdated dependencies come first. New features wait until the app stops getting worse.
- Set up maintenance. Monitoring, backups, a support process, and clear response times for urgent issues.
- Move the roadmap forward. Once the app is stable, the team picks up new features in regular sprints, with a predictable release schedule.
So what should the first month look like? Mostly steps one through four. That can feel slow, but it's normal. IT Craft, one of the best companies for taking over web app maintenance and development, usually starts work within about two weeks of signing, and in the Amesto case it completed the takeover itself in 10 days. A good team won't promise new features on day one, but it should give you a clear plan for when they'll come.
How to Choose the Right Agency
Ask for takeover experience, not just a portfolio
Building new apps and taking over old ones need different skills. Ask: "Tell me about a web app you took over from another team. What did you find, and what did you do in the first 30 days?" Good answers include specifics: what they kept, what they fixed first, and how long it took to stabilize.
Make sure they know your stack
An agency that's great at React may struggle with an old PHP backend. Check that the team has worked with your exact framework and versions, especially if they're old.
Get an audit before a long contract
A good agency won't quote a full year of work without seeing your code. Start with a paid or free audit and use it to compare vendors.
Check how maintenance and new development fit together
Some teams only do upkeep. Others only want new features. You need both. Ask how they split hours between maintenance and the roadmap, and how they handle urgent fixes in the middle of a sprint.
Look at time zones and response times
If your app is customer-facing, ask how fast they respond to a critical bug and whether they cover your business hours. US-based teams are easier to reach during the day. Teams outside the US can still work well if they have solid overlap with your hours and a clear process for urgent issues.
Protect yourself in the contract
Make sure you get full IP ownership, access to all accounts in your company's name, and an exit clause. The reason you're switching teams is often that the last contract didn't cover this.
Questions to ask every agency on your shortlist
- What does your takeover audit include, and what will I get at the end?
- Have you worked with our framework and its current version?
- How long will it take before you can safely ship changes?
- Who will work on our app, and how senior are they?
- What are your response times for critical bugs?
- How will you report what you did each week or month?
How Much Does It Cost to Hand Over Web App Maintenance and Development?
Most agencies don't publish fixed prices, because the cost depends on the app. But here's a rough picture.
Hourly rates (based on Clutch profiles):
- Kanda Software: $99/hr
- Atomic Object: $199/hr
Takeover audit: one 2026 pricing guide for New York estimates $12,000 and 5–12 days for an audit before signing a maintenance agreement. Some agencies offer a free code review instead.
Monthly maintenance: the same guide puts web app support in New York at $9,000 per month for 10–40 included hours.
Ongoing takeover with active development: Saritasa says its project takeover clients spend at least $80,000 a year.
Teams outside the US, or with mixed US and offshore staff, often charge less per hour. But don't pick on rate alone. A cheap team that misreads your codebase will cost more in the end than a pricier one that gets it right.
The biggest factors that move the price are:
- How big and complex the codebase is
- How old the framework and dependencies are
- Whether there's documentation and test coverage
- How much new development you want each month, on top of maintenance
- How fast you need responses to urgent issues
