Coherent product build
LifeOS Junior
A parent-operated financial and decision-learning platform for children. Useful as proof of a coherent product build.
Vue 3 · TypeScript · Express · PostgreSQL · Docker · CI
Serie3
The first serious version of your startup software.
Serie3 helps funded founders turn serious product ideas into production-grade software in 2-4 months. Fixed project fee, small equity alignment, no co-founder expectations.
Best fit for seed-stage or well-capitalized founders building technically meaningful products before a full engineering team is in place.
01 / Offer
Not an agency. Not a freelancer. A compressed senior build phase before you hire the team.
Early software decisions compound. Serie3 helps founders avoid the common trap: a demo that raises interest but cannot become the system the company needs. The work covers product architecture, core implementation, AI-assisted delivery workflows, technical governance, and the operational path from build to production. After the build, the company can hire, raise, sell, or continue with a focused paid support phase without depending on Serie3 as a co-founder.
01
Product architecture
Translate product ambition into a system that can actually be built, operated, and evolved.
02
Production implementation
Build the core application, platform, integrations, data model, and deployment surface.
03
AI-assisted engineering
Use governed AI development workflows to increase output without losing review, traceability, or architectural control.
04
Founder technical leverage
Give founders the technical clarity to sell, raise, hire, and prepare for Series A without pretending every unknown is solved.
02 / Model
A serious build deserves a serious structure.
Projects are priced between USD 100k and USD 300k, paired with 0.25-1.5% equity, warrants, or advisory shares. The cash fee is primary. The small upside component exists because Serie3 compresses the first serious build into 2-4 months at materially less than the cost, delay, and management burden of hiring a comparable team.
Focused Build
USD 100k-150k + 0.25-0.5%
6-8 weeks
For a narrow product with clear scope, one primary user journey, and limited integration risk.
Core Platform
USD 150k-225k + 0.5-1%
10-12 weeks
For a meaningful product surface with backend, frontend, integrations, data workflows, and production deployment.
Complex System
USD 225k-300k + 1-1.5%
14-16 weeks
For platforms involving AI, real-time behavior, multi-role workflows, data infrastructure, operational tooling, regulated domains, or high architecture risk.
Every engagement includes
-
Architecture decisions, written
Each non-trivial technical choice documented as an ADR - the founder can read it, the next engineer can extend from it.
-
Production deployment + runbook
The system ships to production with a runbook covering deploy, rollback, monitoring, and the failure modes that actually matter.
-
Weekly founder-readable updates
Plain-English progress notes every week. What shipped, what's next, what's at risk, what needs a founder decision.
-
Plain-English handoff
At completion: a written handover that an incoming CTO or first engineering hire can read in an afternoon and pick up from.
These are starting structures, not menu prices. Serie3 does not take equity-only projects and does not imply co-founder, CTO, or long-term operator obligations unless a separate agreement is made.
03 / Method
AI speed with engineering governance.
The advantage is not simply using Claude Code or AI tools. The advantage is a governed delivery system: requirements are decomposed, architecture is made inspectable, implementation is reviewed, and the codebase remains understandable as velocity increases.
- 01
Discovery
Define the business goal, product shape, user journeys, system boundaries, and technical risks.
- 02
Architecture
Establish the core model, integration boundaries, deployment approach, data flows, and non-negotiable quality constraints.
- 03
Governed Build
Use AI-assisted development under review, with clear ownership, tests, documentation, and decision records.
- 04
Production Readiness
Prepare the system for real users: deployment, observability, security basics, handover, and founder-facing technical clarity.
- 05
Handoff
Leave the founder with a coherent codebase, architecture notes, operating instructions, and a path to hire or continue with a focused support agreement.
04 / Fit
Best for founders building something that cannot be faked with a template.
Good fit
- You have a serious product idea and need the first production-grade version.
- You can invest at least USD 100k.
- You are seed-stage, revenue-backed, or personally capitalized enough to fund the build.
- You want to move for 2-4 months before hiring a full team.
- Equity is meaningful as upside alignment, not a substitute for cash.
- The software has technical risk, integration complexity, data depth, AI workflows, or operational importance.
- You value long-term architecture as much as speed.
Bad fit
- You only need a landing page or simple CRUD app.
- You want the cheapest possible MVP.
- You expect equity to replace cash.
- You need a large agency team.
- You want code without product and architecture judgment.
- You are looking for a technical co-founder rather than a defined build partner.
05 / Proof
Built from two decades of hard software and an internal product lab.
Serie3 is led by Boban Karisik, an engineering leader with 20+ years across distributed platforms, government digital services, fintech infrastructure, real-time systems, AI-assisted engineering workflows, digital twins, and enterprise architectures.
Before offering this model to founders, Serie3 pressure-tested the method on an internal product lab: multiple product-shaped systems built with the same governed AI-assisted delivery framework, documentation discipline, architecture process, and production hygiene expected in client work.
01
Government digital services
Identity, integration, auditability, and operational resilience across public-sector systems.
02
Fintech and regulated platforms
Transaction systems, security-sensitive integrations, distributed teams, and availability constraints.
03
Operational intelligence
Data platforms, digital twins, simulation, real-time response, and AI-assisted decision surfaces.
04
AI-assisted engineering governance
A working development framework for using AI agents without losing architecture, traceability, or code quality.
Internal Lab
Proof of method, not client case studies.
Enterprise platform credibility
Zora MDM
Enterprise master data management platform with stewardship workflows, auditability, and operational documentation.
PostgreSQL · PostGraphile · Vue 3 · Authentik · NATS
Hard-system credibility
Sentinel
Real-time OSINT and geospatial intelligence system exploring ingest, normalization, anomaly detection, situation lifecycle, and self-hosted deployment.
Real-time · Geospatial · OSINT · Self-hosted
These are internal lab projects, not client case studies. Their role on the website is to prove method, range, and engineering seriousness without pretending they are revenue references.
06 / Contact
Bring a serious problem.
If you are building a startup where the first technical execution matters, send a concise note with the product, stage, budget range, timeline, and why the software is technically meaningful.
Not a fit for staff augmentation, generic outsourcing, unpaid equity-only projects, long-term CTO expectations, or commodity websites.
FAQ
Questions
Is Serie3 a development agency?
No. Serie3 is a selective senior technical build partner for funded startups. The work includes architecture, implementation, delivery governance, and founder-facing technical judgment.
Do you work for equity only?
No. Equity aligns upside, but every engagement includes a cash fee. Serie3 does not use equity to replace budget.
Can you replace a CTO?
No. Serie3 can cover the early technical build gap, create the first serious system, and help founders understand what to hire next. It is not a permanent executive replacement or co-founder arrangement by default.
What stage is best?
Seed to pre-Series A is the natural fit, especially when the founder has capital, domain insight, or investor access but needs serious technical execution before hiring a full team.
What happens after the build?
Possible paths include handover to an internal team, a focused support agreement, another defined product phase, or helping identify the first technical hires.
Are the internal products client case studies?
No. Projects such as LifeOS Junior, Zora MDM, and Sentinel are internal lab work: evidence of method, architecture range, and delivery discipline. They are not framed as customer outcomes.