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San Francisco · Engineering partner for US startups
Your next technology investment will either accelerate your business or set it back 18 months.
The difference is who builds it. Rabbit Byte is the senior engineering partner seed-to-Series-B founders trust when the next release has to ship on time, on budget, and actually scale.
6
Production systems live today
10+
Years in software engineering
0
Rewrites across engagements
60k+
Readers on the engineering blog↗
// Operating Principles
Three studio rules we refuse to break.
Build for the real workflow.
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Use AI with guardrails.
Traceable, reviewable, useful.
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Automate repetitive work.
Keep humans on decisions.
// Services
What Rabbit Byte actually delivers.
Custom builds, AI-enabled systems, recovery work, and technical consulting — shaped around real operations, not the sales deck.
01
Custom Software Development
Purpose-built systems for startups that have outgrown spreadsheets, patchwork tooling, or generic SaaS.
02
Web Applications
Full-stack products, portals, dashboards, and internal platforms built for clarity, scale, and ownership.
03
Mobile Apps
Cross-platform mobile products with a shared codebase and a practical path to launch and iteration.
04
AI Integrations
LLM features, copilots, retrieval workflows, and AI-assisted experiences connected to real business data.
05
Automations
Operational workflows that remove repetitive work across sales, support, internal ops, and back office.
06
IT Consulting
Technical direction for teams choosing architecture, stack, digitalization strategy, or delivery priorities.
// Delivery Process
From scope to stable ownership.
Rabbit Byte keeps a software-first bias in client work: readable systems, clear boundaries, practical automation, and no fluff around the hard parts.
01
Map
We start with business flow, constraints, and risk. The goal is to understand what must be built, what should be automated, and what must stay human.
02
Architect
Scope becomes a delivery plan: product boundaries, integration points, data movement, AI touchpoints, and a stack that can survive long-term ownership.
03
Ship
Web apps, mobile apps, APIs, internal tools, and automations — built with maintainability in mind, not just speed-to-demo.
04
Harden
Security checks, observability, monitoring, and handover support keep the system usable after launch day.
// Proof
We don't publish case studies. We walk you through them.
Named clients, real metrics, and the architecture behind them — on a 30-minute scoping call. We share what's relevant to your problem, not a generic deck.
// Focus Areas
Delivery lanes for products, AI, and consulting.
Core stack: TypeScript, Node.js, NestJS, React, Next.js, Flutter, Postgres, Docker. Picked because they scale, not because they're fashionable.
Product Engineering
For teams building from zero or replacing brittle internal systems.
- Custom platforms and internal tools
- Full-stack APIs and admin panels
- Web + mobile delivery paths
High-leverage lane
AI & Automation
For teams that need AI connected to operations instead of isolated demos.
- LLM integrations and workflow agents
- Operational automations with human checkpoints
- Evaluation-minded rollout planning
Consulting
For founders and companies making architecture or transformation decisions.
- Technical discovery and scope shaping
- Digitalization and system-fit analysis
- Delivery planning grounded in constraints
Core stackTypeScriptNode.jsNestJSReactNext.jsFlutterPostgresDocker
// How we engage
Clear terms. No discovery-call hostage situations.
Every engagement scoped upfront. Contracts: one page, plain English. Pick the rhythm that matches your product stage.
Sprint
Project-based
Scoped delivery with a fixed timeline
Best for teams that know what they need built.
- Discovery and scope document
- Full delivery: design through deploy
- Handover with documentation
- Post-launch support window
Most flexible
Retainer
Monthly
Ongoing engineering capacity on call
Best for teams with a roadmap and recurring needs.
- Dedicated development hours
- Priority response and scheduling
- Weekly standups and async updates
- Architecture advisory included
- Flexible scope month to month
Advisory
Hourly / day-rate
Technical leadership without the build
Best for founders making architecture or vendor decisions.
- Technical discovery sessions
- Stack and vendor evaluation
- AI readiness and risk assessment
- Delivery plan and hiring guidance
Rareș Tarabega
The founder
One founder. Six production systems. Yours is next.
When you engage Rabbit Byte, Rareș leads the architecture, owns the delivery, and stays accountable through handoff. The person who set the standard is the one building it.
Founder & CEO, Rabbit Byte · CTO & Co-Founder, Exminds
San Francisco company · Engineering led from Bucharest · Daily 9am–1pm PT overlap, async-first delivery in between.
github.com/zenstok- 10+ years in software engineering
- Led teams of 4+ senior engineers
- Built a full SaaS platform from zero to production
- 6 live systems across recruiting, logistics, real estate, procurement
- Zero rewrites across all engagements
- 60,000+ readers on the engineering blog↗
Start with no risk
Let's start with a free operations audit.
Book a 30-minute scoping call. Then we'll go further at no cost — you walk away with a clear roadmap, yours to keep.
Scoping Call
You walk us through your operations. We listen, ask questions, and identify the biggest opportunities.
Custom AI & Automation Audit
We analyze your workflows and deliver a clear roadmap: what can be automated, where AI fits, and what to prioritize first.
Based in San Francisco · Serving US startups from seed to Series B