Software that
fits your
business.
From AI and automations to CRMs, ERPs and whatever your operation needs — custom software, built around how you actually work.
























The companies we'rebuilding
for right now.
Engineering partner to ambitious founders and operators across multiple industries — shipping production-grade software on a weekly sprint cadence.
Client 01
Client 02
Client 03
Client 04
Client 05
Client 01
Client 02
Client 03
Client 04
Client 05
Client 01
Client 02
Client 03
Client 04
Client 05
Client 01
Client 02
Client 03
Client 04
Client 05Eight builds,
one philosophy.
We sit with your team, map the actual workflow, then decide which of these eight shapes the right build. No retainer treadmill, no feature-stuffing.
Custom AI products, built for one business.
Internal copilots, document understanding, intelligent search, agentic workflows — grounded on your own data.
The boring work, quietly handled.
Lead routing, invoice extraction, onboarding flows, multi-app syncs. Replaces the spreadsheets glued between your tools.
CRMs that match how you actually sell.
Pipelines, fields and reports built around your real sales motion — not a 2,000-feature platform you'll use 4% of.
Operations software without the SAP-tax.
Inventory, ops, finance and HR in one place. Modular, cloud-native, priced for an SMB. Start with one module, expand on numbers.
Inventory that predicts itself.
Stock levels, reorder points and demand forecasts your team can trust. Multi-branch, multi-SKU, AI-tuned to your sales cycle.
Storefronts wired to your back office.
Custom commerce — Shopify, Medusa or fully bespoke — connected to your inventory, accounting and CRM so nothing falls between systems.
Books that close themselves.
AI receipt + invoice ingestion, auto-categorization, reconciliation, and Xero/QuickBooks sync. Audit-clean, month-end in hours.
Clinical software, built for your practice.
Patient records, scheduling, charting and billing tailored to your clinic. HIPAA-aware, mobile-ready, with AI note-taking and triage.
From “let’s talk” to live in 4–8 weeks.
Fixed-scope sprints, weekly demos, and a working pilot in your hands before we ever scope a phase two. No 90-page SOWs.
Discovery
Working sessions where we shadow your team, map the workflow, and identify the 2–3 highest-leverage builds.
Blueprint
One-page architecture, a clickable prototype, fixed price and date. You approve before a line of code ships.
Build
Weekly demos every Friday. You see real, working software each week — not status decks.
Pilot & ship
A pilot with your team. We train, document, and hand over keys — or stay on a support retainer.
Recent builds.
Real products shipped to market — built by our founding team and backed by real outcomes, not vanity metrics.
AI-Powered White-Label Fitness SaaS
A multi-tenant platform with AI workflows that cut admin workload across every gym on the system.
Travel Agency AI Support Platform
NLP-driven support + CRM that answers travellers around the clock.
Automated Lead Generation Platform
AI outreach agents + analytics that fill the pipeline on autopilot.
Real Estate Lead Generation Platform
Lead matching + booking for a Metro Manila residential development.
Inventory & CRM Operations Platform
Unified inventory, CRM and analytics for a multi-branch coffee business.
See every build we've shipped.
View all case studiesA different kind of agency.
We're a small senior team — no junior account managers, no offshore handoff, no 30-page status decks. You talk to the people building your software, every week.
The engineer behind every BuildFast build.

BuildFast Labs is led by Carl Saguinsin — a senior software engineer and AI specialist who has spent years building products that ship, scale, and win. The team is small by design — focused, accountable, and led by Carl at every level.
You won't get handed off to juniors after onboarding. The person who scopes your project is the one who builds it — Carl reviews every line of code, and you work directly with the engineer doing the actual work, never a project manager reading you status updates.
Career Highlights
Recognized for engineering and AI excellence:
Won the top prize at KMC's Talent Matchmaking Challenge hackathon, developing innovative AI-powered HR solutions.
Secured third place in technology innovation competition focused on building solutions for a better future.
Reached finals in AI-focused hackathon, showcasing innovative solutions in artificial intelligence and machine learning.
Achieved top 5 finish in fintech innovation challenge, developing cutting-edge banking technology solutions.
Want to talk to Carl directly before committing to anything? That's exactly how he likes to start.
Do we own the code?
100%. Repo, infrastructure, docs and runbooks are handed over the day we ship. We never lock you in.
We're not in the Philippines — does that matter?
Most of our clients aren't. The team overlaps with US (PT/ET morning), EU (afternoon), and APAC (full day). We schedule weekly demos in your timezone, not ours.
Which AI models do you use?
Whichever wins your eval. We benchmark across Anthropic, OpenAI, Google and open models per task — cost, latency and accuracy on your data, not ours.
Where does our data live?
Your cloud, your account. We deploy into your AWS / GCP / Azure tenant by default — or your VPS if you prefer. We never train shared models on your data.
What if it doesn't work out?
Discovery has a kill switch — if the blueprint doesn't excite you, you walk away with it and we part ways. Build sprints carry a 30-day warranty after ship.
Let's build software
that fits you.
30 minutes, no pitch deck. We'll talk through your workflow and tell you — honestly — whether custom software is worth it for you.
Talk Directly with the CEO
Skip the wait. Get answers immediately.
No commitment required. 100% free.
Send Us a Message
Prefer async? Send us a message instead.
Or reach out directly