How Vervali Load Tests Shopify Stores Before Black Friday
How Vervali load tests Shopify and Shopify Plus stores before Black Friday: the Shopify rules, what gets tested, when to start and what it costs.
API Load and
Performance Testing
Vervali runs API load and performance testing: concurrent requests against the services you named, measuring throughput, latency and error rate at the shape you actually get, with k6, JMeter and Gatling. Every engagement ends with the breaking point, the bottleneck and what to change, written so a product owner can act on it.
150+ clients
450+ projects
275+ engineers
15+ years
ISO/IEC 17025:2017Accredited testing laboratory
CMMI Maturity Level 3The process is written down and repeats
ISO 9001:2015Quality management
ISO/IEC 27001Information security
API Load, Latency and the Error Rate at Peak
Concurrent requests against the services you named, at the shape you actually get, against staging.
Concurrent API Traffic
Throughput, latency and error rate at the shape you named. A check that never leaves one happy-path endpoint is not the engagement.
REST, GraphQL and Third-Party APIs
The surfaces you named, including GraphQL and third-party APIs when they are in the quote. Contract work is on API testing services.
Latency Under Load
How response times climb as concurrency rises, and where the slowest requests go. We report the tail as well as the average, because a slow few are what callers notice.
Error Rate at Peak
Which service fails first and what the caller sees when it does. A screen that stays up while one service times out is a failed journey.
Microservices and Cloud-Native
Load on the path a caller actually hits shows which service dies first. AWS and Azure are the platforms Vervali builds on.
Staging First
A staging environment you own. Production is in the quote only when you name it, with a rollback.
Need the API peak before your callers find it?
Free 1-Hour Load TestHow This Work Is Packed
API load is one slice of performance work. These are the neighbouring packs.
Performance Testing
Load, stress, soak and spike, with the bottleneck named in plain English. See performance testing.
Load Testing
Expected traffic on web and mobile surfaces. See load testing.
API Testing
Functional, contract and auth coverage on the same APIs. See API testing services.
Performance Optimization
Tuning after the finding. See software performance optimization.
Already know the endpoints and the peak? A QA lead can scope it.
Book a CallThe Report and the Pipeline
What you receive, and where it runs.
Metrics We Track
Latency, throughput and error rate, with the bottleneck named in your own units. CPU and memory are added when the estate is in scope.
The Final Report
The breaking point, the bottleneck, what to change and what was not tested, written so a product owner can act on it.
In the CI/CD Pipeline
GitHub Actions, Jenkins or Azure DevOps. Pull requests get a short set and nightly gets the wider load. Pipeline design is on DevOps consulting and CI/CD.
Proof From Delivery
Three delivery engagements, sector and country. They show Vervali has tested systems at that scale and were not API-load-only jobs.
India · major airline · booking and check-in
A major airline booking and check-in platform. After: 40% faster page loads. API load on a booking path is concurrency on the services behind the screen, not a round number of virtual users on the home page.
40% faster page loadsAustralia · cybersecurity SaaS · DDoS simulation
A cybersecurity SaaS product under high-intensity DDoS simulation. After: 99.9% platform stability on that run. API load includes how it fails, not only how green the dashboard looks.
99.9% platform stabilityIndia · Mumbai supplements retailer
Peak-load work on a retail storefront. After: 40% faster pages and 50% more mobile conversions. The peak that mattered was concurrency at checkout, including the APIs checkout calls.
40% faster pages 50% more mobile conversionsHow an Engagement Starts
From the endpoints you named to a breaking point you can plan around.
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01
Share the Endpoints
Tell us the endpoints, the callers and the peak you have to survive, with a staging environment under NDA.
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02
Get the Traffic Model
We build the profile from your analytics: which calls run, how they are weighted and where concurrency peaks.
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03
Start With a 1-Hour Load Test
A free 1-hour load test on a staging URL is the first look. Most engagements land at $25 to $49 an hour blended, and price follows endpoints and the peak.
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04
Get the Report
The breaking point, the bottleneck and what to change, 9am to 1pm Eastern with delivery from India.
Frequently Asked Questions
Concurrent requests against the APIs you name, measuring throughput, latency and error rate at the shape you actually get. k6, JMeter and Gatling are the defaults. The full software-load pack is on performance testing, and functional coverage is on API testing services.
A screen that stays up while one service times out is a failed journey, not a green report. Load on the path a caller actually hits shows which service fails first. AWS and Azure are the platforms Vervali builds on, and a free 1-hour load test is the first look.
Latency, throughput and error rate, with the bottleneck named in your own units. CPU and memory are added when the estate is in scope. A report only a performance engineer can read changes nothing, so we write it for a product owner. A free 1-hour load test shows what we would report.
We run against a staging environment you own. Production is in the quote only when you name it, with a rollback, and we will not run against it without that written down. A free 1-hour load test shows whether staging is honest enough. Coverage is 9am to 1pm Eastern.
Yes, when that is in the quote: GitHub Actions, Jenkins or Azure DevOps, whichever you already use. Pull requests get a short set and nightly gets the wider load. Pipeline design is on DevOps consulting and CI/CD. A free 1-hour load test shows what already runs.
Yes, on the surfaces you name. GraphQL, REST and third-party APIs are in scope when those contracts are in the quote. Functional and schema checks are on API testing services, and this work covers the load those contracts have to survive.
The breaking point in your own units, the bottleneck named, what to change, and what was not tested. A report only a performance engineer can read changes nothing, so we write it for a product owner. It is the API load slice of the full performance report.
Most engagements land at $25 to $49 an hour blended. Price follows the endpoints, the peak you named, and whether soak sits in the same week. A free 1-hour load test on a staging URL shows the surface before anyone writes a quote.
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