CV · Rev 2026.10
Tomislav Ćalušić
Software engineer · AI integration · Split, Croatia
Full-stack engineer with nine years across banking, telco, automotive, and government enterprise — most recently wiring LLMs into real products. Comfortable across the stack: Java/Spring Boot and .NET back-ends, Angular and React front-ends, raw Postgres + pgvector, Python for AI integration work. Currently looking for AI integration roles where the unglamorous parts of the system — auth, multi-tenancy, storage, DNS — matter as much as the model.
Photo Portfolio Platform · solo build
Multi-tenant SaaS where each photographer manages a full website by chatting with a Telegram bot.
Bot AS the CMS (not on top of one): every CMS operation — uploads, captions, layout, theme, DNS binding — exists as a tool the model can call. Claude Haiku driving an agentic tool-use loop. FastAPI back-end with raw psycopg3 (no ORM — tenant filtering visible in every query). Caddy with on-demand TLS gated by a registration-check endpoint, so each photographer can point any domain at the same IP and get a cert seconds later. More on the project → (live demo by invitation)
- Claude Haiku
- FastAPI
- psycopg3
- Postgres 16
- Next.js 14
- Cloudflare R2
- Caddy
- Docker
Veseljko — veseljko.hr · co-built with a colleague
End-to-end Croatian platform for the full lifecycle of weddings, baptisms, birthdays, and other family events — digital invitations and RSVPs, guest photo/video galleries, printable invitations and QR cards, seating, package/add-on commerce, and a back-office admin app.
Clean-architecture .NET 10 solution split into Domain / Application / Infrastructure / SharedKernel, with custom CQRS abstractions (IQueryHandler, ICommandHandler, auto-registered) and a Result<T> error model; antiforgery + cookie auth across two front-ends (owner/guest Web app and staff Office app). EF Core 10 on PostgreSQL with snake_case naming and code-first migrations across Development / RemoteDevelopment / RemoteProduction.
Templating engine drives 30+ database-seeded invitation themes per event type (Wedding/Bachelor/Bachelorette/Baptism/Birthday/Confirmation/FirstCommunion × Classic/Deco/Editorial/Modern) with CSS-only theming and a placeholder substitution pipeline; owner-editable inline static text co-exists with non-editable lock islands that keep database-derived regions (schedule, RSVP QR codes, organiser contacts) live across edits. Print pipeline does browser-native multi-page printing (blank/front/blank/back, 2-up on 10×7" sheets) and A5 QR cards, verified end-to-end with headless Chromium PDF rendering.
Media subsystem has pluggable storage providers (local filesystem, Cloudflare R2), per-package upload limits, thumbnail generation, password-protected guest galleries, and a live-presentation slug for projecting guest uploads during the event. Office back-office handles a shopping cart for packages and add-ons with per-event feature overrides, plus partners, reviews, inquiries, and a blog. Full Croatian UI with culture-aware date formatting (hr-HR). More on the project →
- C#
- .NET 10
- ASP.NET Core MVC
- Razor
- EF Core 10
- PostgreSQL
- Clean Architecture + CQRS
- Cloudflare R2
- QR generation
- headless Chromium PDF
- hr-HR i18n
DeHost — dehost.io · co-built with a colleague
A Web3 platform for censorship-resistant, serverless website hosting.
Built a full-featured dApp frontend for a serverless, blockchain-based hosting platform on the Base chain. Implemented decentralized file publishing, on-chain domain registration, and wallet-based user management. Integrated multiple wallet flows including modern account-abstraction sign-in, with automatic network handling. Delivered a responsive, component-driven UI with strong UX and SEO foundations. Currently live on Sepolia testnet at dehost.io. More on the project →
- Svelte 5
- SvelteKit
- TypeScript
- TailwindCSS
- Vite
- Web3 (wallet + smart-contract integration)
Senior Software Engineer · Intellexi
Senior Software Engineer on critical modernization initiatives at HPB — Croatian Postal Bank — adapting core banking infrastructure and front-office systems to new Croatian regulatory and legal requirements.
Architected and delivered a complete new Angular front-end replacing legacy JSF pages used daily by bank personnel, with active participation in architecture and technical design. Designed the secure Spring Boot REST APIs, integrations with external systems, and a custom gateway/routing middleware layer connecting the front-end to core financial back-ends.
Built the real-time integration with HROK (Croatian Credit Information Registry) for mandatory credit-availability checks, dynamic in-code PDF generation for regulated documents (credit agreements, compliance reports, account statements — all branded and legally compliant), and 2D scanner integration for document capture and verification in banking processes. Owned the Oracle PL/SQL layer (stored procedures, query optimisation, schema changes, data migrations), OpenLiberty application servers, and Jenkins CI/CD pipelines; debugged and performance-tuned production systems.
- Angular
- Spring Boot
- Java
- Oracle PL/SQL
- OpenLiberty
- Jenkins
Senior Technical Consultant · CloudSense
Salesforce engagements for three telcos — A1, Telefónica, Liquid Telecom.
Developed A1 Telecom’s eCommerce page on Salesforce in agile cycles, built with Apex and Lightning Web Components. Implemented a new solution-management process for Telefónica, adapted company products to client needs, and ran direct offline client comms. Handled BAU bug-fix and feature work for Liquid Telecom (the main African telecommunications provider) and contributed to Salesforce admin. Code-driven PDF generation via PDF Butler.
- Salesforce
- Apex
- Lightning Web Components
- PDF Butler
Software Engineer · GlobalLogic
Two automotive cloud platforms — Stellantis and Daimler / Mercedes Intelligent Cloud.
Stellantis — Internet of Vehicles. Device-management portal in React + TypeScript with Relay/GraphQL, a Java/Spring Boot application gateway behind it, Next.js + Tailwind on the front-end, and Elasticsearch for querying. Jest for front-end tests.
Daimler / Mercedes Intelligent Cloud. Device configuration and remote access: Vue.js + TypeScript front-end and Java/Spring Boot back-end with file converters; front-end tests in Cypress, back-end tests in JUnit 4. Multinational corporate environment with a diverse team.
- React
- TypeScript
- Vue.js
- Java 11
- Spring Boot
- GraphQL/Relay
- Next.js
- Elasticsearch
Software Developer · Maurer Electronics GmbH
Government enterprise platform for tobacco-product traceability.
Helped countries detect illegal smoking products by tracking them from creation to delivery. Three React front-ends — for end users and for the administration team — and Java/Spring Boot REST APIs underneath. PostgreSQL data layer with optimised SQL queries; unit and integration tests in JUnit; UI components built to project spec; CentOS 7 daily, with Maven, Docker, and Jenkins.
- Java
- Spring Boot
- React
- PostgreSQL
- JUnit
- Docker
- Jenkins
Student Software Developer · Sedam IT
Built the back-end for ZgPark — Zagreb's pay-parking-by-phone service.
Designed and developed back-end APIs used by thousands of drivers to buy parking tickets over the phone, plus the admin interface (front + back) used by parking-system operators. MS SQL Server, Tomcat.
- Java
- XML
- MS SQL Server
- Tomcat
Student Software Engineer · Ericsson
Two years on the 4G/5G code that carries ~1B mobile subscribers.
Improved and tested cellular network code in an agile team. Optimised legacy C and Java for performance and reduced complexity. Wrote functional and component tests in Erlang and Java (JUnit). Built a shell-pipeline runner using M4 macros and Bash so test suites ran consistently both locally and on Jenkins.
- C
- Java
- Erlang
- Bash
- M4
- JUnit
- Jenkins
M.Sc., Computer Science · FESB, University of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture.
B.Sc., Computer Science · FESB, University of Split
- Back-end
- Java · Spring Boot · Python (FastAPI) · C# · .NET · ASP.NET Core · EF Core · Node.js · Oracle PL/SQL · Postgres + pgvector · MS SQL · Elasticsearch
- Front-end
- Angular · React · TypeScript · Next.js · Svelte · SvelteKit · Vue.js · Tailwind · GraphQL/Relay
- AI / LLM
- Claude (Haiku, Sonnet, Opus) · OpenAI (Responses + embeddings) · agentic tool-use loops · vector embeddings · pgvector · evals
- Infra
- Docker · Caddy · Cloudflare R2 · Jenkins · Alembic · Linux
- Salesforce
- Apex · Lightning Web Components · PDF Butler (Salesforce Certified Associate)
- Languages
- Croatian (native) · English (professional) · Italian / German (elementary)