I turn messy workflows, spreadsheets and ideas into structured digital systems — from estimation dashboards and internal tools to SaaS prototypes and AI-assisted workflows.
I connect AI, Excel, automation and product thinking into practical systems that save time and create real leverage.
Small SaaS tools, productivity systems, household apps and AI-assisted workflows built with React and Supabase.
Advanced spreadsheets, BOQ logic, dashboards, work norms and technical classification systems for complex projects.
OpenAI, Google tools, Supabase, n8n, Zapier and custom process automation that eliminates repetitive work.
Interactive concepts, visual tools, product prototypes and creator-focused workflows that bridge logic and design.
Each project solves a real workflow problem — not a design exercise.
Structured Excel and estimation workflows for electrical and industrial projects — BOQ mapping, cable classification, work norms and bid preparation logic built over years of real-world use.
Speeds up technical bid preparation and significantly reduces manual errors on complex tenders.
A medicine tracking PWA for caregivers — doses, schedules, refills and interaction warnings for every family member, all in one place. Built with offline support and a clean mobile-first UI.
Reduces medication errors and gives caregivers clarity over complex household health routines.
A fridge and freezer inventory PWA that tracks food items, expiry dates and shopping lists from any device. Built with a dark mobile-first UI and offline support.
Reduces food waste and helps households stay organised without mental overhead.
A household cleaning inventory PWA — tracks cleaning supplies, expiry dates and shopping lists from any device. Companion app to ColdStock with a shared design system.
Eliminates the "we ran out again" problem by keeping household supplies visible and organised.
Custom dashboards, Gantt tools, calculators and workflow systems built with advanced Excel logic. Covers project management, financial tracking, resource planning and reporting.
Transforms spreadsheet-heavy work into structured decision-making systems with clear outputs.
My edge isn't just the tools — it's the structured thinking behind every system I build.
Understand the real workflow, not just the visible task. Find where the friction actually lives.
Classify data, decisions, exceptions and rules. Build the logic before writing any code.
Create dashboards, tools, prototypes or automations that match the real use case exactly.
Check edge cases, user behaviour and weak assumptions before calling anything done.
Add AI only where it creates real leverage — not as decoration, but as genuine force multiplier.
I'm not an agency. I'm a specialised systems builder who works directly with you.
For businesses with manual, repetitive or spreadsheet-heavy processes. I map what you do, identify what can be automated, and deliver a clear action plan.
For teams that have outgrown spreadsheets and need dashboards or web tools. I convert your Excel logic into a structured, scalable system.
For founders, teams or creators who want to test an internal tool or SaaS idea quickly. Fast MVPs with real architecture — not throwaway demos.
I'm Gintaras Jonika — a technical-creative builder from Lithuania. I combine Excel architecture, AI tools, automation logic, 3D visualisation and product thinking to create practical systems for complex work.
My background connects technical estimation, visual design, analytics and automation — which helps me see both the structure and the user experience of any system I build.
My edge is the combination of technical logic, visual thinking and practical business systems. I understand spreadsheets, workflows, estimation, design, AI tools and product thinking — and I connect them into working systems.
I turn messy processes into usable digital systems. If you have something that needs structure — let's talk about what that could look like.