Modernize critical Java systems without a risky rewrite
We improve performance, scalability, security and maintainability step by step, while the system keeps running.
Systems we built, measured in production
- 1,000,000,000
- financial transactions in under an hourFastPost accounting platform · In production since 2013FastPost case study
- 300,000,000
- hotel search queries per dayUK hotel metasearch · 80% lower infrastructure costHotel search case study
- 20-30 ms
- per real-time AI/ML recommendationRecostream · built in-house, acquired by GetResponseRecostream case study
Clients and partners
The team that proves it is the team you get
Proven at production volume
The ledger, the metasearch engine and the recommendation engine on this page are systems we built and ran ourselves, each with a case study you can check.
The architect you meet stays on the work
Our engineers are direct employees and nothing is subcontracted. Annual attrition is 7%, so the people who scope your system are the people who build it.
A number before any workshop
After a thirty-minute call you get a written ballpark with its assumptions, not an invitation to a paid discovery phase.
Still answering in year three
When delivery ends you get documentation and a handover, or we keep the system running under a support retainer. One current client has worked with us for more than ten years.
- Founded
- 2013, in Poland
- Engineers
- Senior, all direct employees
- Attrition
- 7% a year
- Longest current client
- More than ten years
Build, improve, run and extend your Java platform
Case studies in finance, travel and ecommerce
- Flagship · Banking and fintech · from 2013
FastPost: a billion financial transactions in under an hour
FastPost, a rule-driven, high-performance accounting platform developed for Legerity by Stratoflow from 2013, used by telcos and insurers worldwide.
1,000,000,000 transactions / hour
- Flagship · Travel · 2019
UK hotel metasearch: 300 million queries a day at 80 percent lower cost
A SQL Server cluster that stopped scaling replaced by an in-memory data grid: 50 percent more traffic, 60 percent lower response time, 80 percent lower infrastructure cost.
300,000,000 queries / day
- Ecommerce · 2026
Wine merchant platform: 47 critical and high vulnerabilities to zero
An online store and a back-office ERP built up over fifteen years, moved from Java 17 and Spring 5.3 to Java 25 and Spring 6.2 in about four weeks, with no rewrite and no feature freeze.
47 vulnerabilities to zero
What clients say about working with us
The developed software product was built from scratch with solid quality. We have had a long-term engagement with Stratoflow for nearly 10 years. We look at them as partners, rather than contractors. I'm impressed by their team culture and cross-team support.
Launching this platform is a key step in transforming the way we serve organizations and travelers. We needed a solution that paired excellent group travel insurance with our patented, scalable model for personalized traveler upgrades. We required a smooth migration of our existing clients along the way. We’ve gone from implementation to production in only eight weeks.
Fiona LallyChief Executive Officer, Core Travel InsuranceWe are very pleased with our partnership with Stratoflow and, as we continue to grow, we expect to increase the numbers of developers that work with us on our projects. They're extremely reliable, and they have a very good company culture of their own, which gives them a real edge compared to other providers that serve more as production shops rather than thought partners and creative problem solvers.
Built for regulated, high-volume industries
Banking and fintech
Ledgers, payments and lending platforms, and extensions around the core, where every balance has to reconcile and latency is a business number.
Insurance
Policy administration, rating, claims and broker systems, including Openkoda implementations that take a product from contract to production.
Travel
Metasearch, availability and pricing engines and flight schedule processing, built for traffic peaks and supplier APIs that misbehave.
Ecommerce
Real-time pricing connected to market feeds, catalogue search and product recommendations for stores with heavy traffic.
Real estate
Project and property management systems that bring GIS data, locations and workflows together for owners and developers.
From a scoping call to a written ballpark within a week
You speak with an architect from the first call, and the same engineers carry the work through delivery.
Scoping call
Thirty minutes with an architect. You leave with a written view of which offer fits, or that none does.
Ballpark estimate
Scope, assumptions, validity period, price model and duration, in writing within a week of the call.
Delivery
Time and materials, retainer or team, with working software demonstrated every week and your feedback steering the next iteration.
Handover or support
Documentation and knowledge transfer, or a managed support retainer if you would rather we kept running it.
From our engineers
- Modernization
Strangler Pattern for Application Modernization
Explore the Strangler Pattern's role in modernizing old software for better business efficiency and agility.
- Performance
How to Build Low Latency Java Applications
How to build low latency Java applications? We show you what to pay attention to while creating high-performance apps.
- Performance
Top 5 Java Performance Problems and How to Solve Them
Explore the top 5 performance issues that Java developers commonly face, and provide tips and best practices.
Book a scoping call
Thirty minutes with an architect, not a salesperson. You leave with a written view of scope, price model and whether we are the right team for it.