SIEM Engineering Services
Custom SIEM Development: Build and Own Your Security Data Platform
WhyCrew's SIEM engineering team builds a security platform around your actual log volume, detection needs, and compliance scope, then hands you full ownership instead of licensing it back as a subscription. A security data lake, custom detection logic, and a zero-downtime migration off your current platform, typically live in 12 weeks.
lower cost
to deployment
migration downtime
source code owned
Stop Renting Your SIEM Capability
A SIEM you license is rented capability, priced by the gigabyte, forever. A SIEM WhyCrew engineers is built once, around your actual environment, and handed over as something you own outright, no per-GB meter running for the rest of the relationship.
That's the entire pitch. Not what a SIEM does generically (our complete guide to what SIEM is covers that), but what changes when it's engineered specifically for you instead of rented from a vendor.
What We Build
Four Core Components, Built by Our SIEM Engineering Team
WhyCrew's SIEM Engineering Services cover four core components, each scoped to your actual environment instead of a generic template:
Security Data Lake Architecture
Your logs land in an open-format data lake (commonly Elasticsearch or ClickHouse under the hood) instead of a proprietary vendor format. You can query it with standard tools, export it freely, and it never locks you into one company's ecosystem.
SIEM Ingestion Optimization
Raw log volume isn't the same as useful signal. We tune ingestion pipelines to normalize, enrich, and de-duplicate at the source, so storage costs and noise both drop before a single detection rule even runs.
Custom Detection Logic
Generic, out-of-the-box detection rules are built for the average customer, not yours. We write detection logic against your actual environment, asset inventory, and identity provider, so alerts reflect real risk.
Zero-Downtime Migration
Moving off Splunk, Sentinel, or QRadar doesn't mean a gap in coverage. Migrations run in parallel with your existing platform until the new one is validated, then you cut over.
Full migration guide →Who This Is Built For
MSSPs
Running dozens of client environments, where tenant isolation, per-client branding, and data residency can't be afterthoughts, they have to be architected in from day one.
See the multi-tenant architecture pattern →Regulated Operators
Where log retention and audit evidence requirements shape the platform from the ground up, whichever specific framework governs you.
Open-Source Foundations, Fully Owned
We build on open-source components wherever they're the right engineering choice, not proprietary black boxes you'd need us forever to maintain. That means no mystery licensing buried in a dependency, and a platform your own engineers can actually read, modify, and extend after handover.
Splunk, Sentinel, and QRadar vs. Custom-Built SIEM
| Factor | Splunk | Microsoft Sentinel | IBM QRadar | Custom-Built (WhyCrew) |
|---|---|---|---|---|
| Pricing | Per-GB, rises with volume | Per-GB via Log Analytics | Per-event or capacity tier | One-time build, no ongoing fees |
| Ownership | Licensed access only | Microsoft-hosted, limited control | IBM-hosted or on-prem, vendor-dependent | Fully transferred: code, infra, roadmap |
| Flexibility | Proprietary SPL | KQL, Azure-coupled | Proprietary AQL | Open formats, no lock-in |
| 3-Year Cost Trend | +15–30% annually | Scales with consumption | Rises with license tiers | Flat after build |
That's the shape of it at a glance, full cost math and 3-year totals are below.
What This Costs
Estimate Your Cost
Pick your daily log volume for an instant estimate, no form to fill in.
WhyCrew Build Cost · One-Time
Single tenant tier
Typical Licensed SIEM · 3-Yr Estimate
vs. a per-GB license
Derived from the 40–70% average savings WhyCrew clients report against licensed SIEM platforms. For an exact number scoped to your environment, book a free architecture audit.
Most clients reach breakeven within 12–18 months, and the savings compound every year after since the cost doesn't scale with data volume the way a license does. Full pricing logic and licensed-vendor comparison →
Documentation, Training, and Full Handover
Every engagement ends the same way: complete API documentation, deployment runbooks, and hands-on engineering training, so your own team can run and extend the platform without needing us. You own the source code and the infrastructure. There's no support contract you're locked into to keep the lights on.
Proven in Production
A German MSSP Cut SIEM Costs 62% With Zero Downtime
A German MSSP running 40+ enterprise clients was paying €45,000 a month in SIEM licensing. WhyCrew's SIEM engineering team replaced it with a custom-built Elasticsearch data lake, migrated 18 months of historical logs with zero downtime, and trained their engineering team in four weeks.
See the full case study →cost reduction
saved per year
hours downtime
platform ownership
How an Engagement Works
Architecture Audit
We map your current log volume, detection needs, and compliance scope. No cost, no obligation.
Fixed-Price Proposal
Scoped to your actual environment, not a generic tier.
Build & Parallel Migration
Your existing SIEM keeps running while we build and validate the new one.
Cutover & Handover
Full documentation and training delivered alongside the production cutover.
Ready to Own Your SIEM?
No cost, no obligation, just an honest look at what a custom-built platform would cost and save in your specific environment.
Frequently Asked Questions
Most engagements go live in 12 weeks from kickoff, scaling up for larger multi-tenant or highly regulated deployments.
In almost every case, yes, over a 3-year horizon, because licensed SIEMs scale with data volume while a custom build doesn't. Most clients see a 40–70% cost reduction.
Your historical logs migrate with you. Migrations run in parallel with your existing platform until the new one is validated, so there's no coverage gap during cutover.
Yes, tenant isolation, per-client branding, and data residency are architected in from the start for MSSP engagements.
You need someone who can operate infrastructure, which most MSSPs and regulated operators already have. We provide full documentation, runbooks, and hands-on training.
Yes. Retention periods, audit evidence, and incident-reporting capability are built into the architecture from day one. The same architecture and ownership model applies everywhere, including the US.