Java Desktop Developer

Company DescriptionInvito Software Solutions is a leading software development company providing world-class web and mobile solutions efficiently and cost-effectively. We specialize in next-generation design patterns, responsive coding techniques, and rigorous quality assurance, resulting in high-quality apps with a high return on investment. Our scalable services and customized engagement models cater to businesses of all sizes, from innovative startups to well-established companies. We develop powerful and effective solutions that meet our clients' specific needs.Project: Spring-Powered Desktop App for Invoice OCR → Clean CSVWhat you’ll buildDesktop Java application (Java 17+) backed by Spring BootRuns locally (offline-first), ships as a single native installer or fat JAR.UI options (pick one):JavaFX UI using Spring for DI (FXML controllers wired via Spring).Swing UI with Spring-managed services.Embedded local web UI: Spring Boot serves a UI (e.g., Vaadin or lightweight HTML/TS), shown in an embedded browser (WebView/JxBrowser).Invoice ingestion: drag-and-drop folders/files; PDF, PNG/JPG; multipage; batch mode.AI/OCR pipeline (pluggable via Spring beans):Local OCR (Tesseract) + layout/zone analysis, orCloud OCR (AWS Textract, Google Vision) with retry/backoff, orLLM-assisted parsing to a JSON schema with guardrails.Field extraction (headers + line items): vendor, invoice #, dates, currency, taxes, subtotals/totals, PO, line descriptions, qty, unit price, amounts.Validation & review UI: show the document preview, highlight extracted zones, flag low-confidence fields, quick edits, autocomplete.CSV export: stable schema; normalize number/date/locale; export per file or batch.Rules & heuristics: vendor templates, regex fallbacks, learned patterns, per-vendor overrides.Quality metrics: confidence per field, accuracy dashboards, reject reasons, simple analytics.Offline by default, with optional cloud connectors for OCR/LLM and template sync.Architecture (Spring-centric)App launcher: desktop entry point that bootstraps SpringApplication.Core modules (Spring beans):IngestionService: drag-and-drop, PDF/image decoding, page splitting.OcrService (strategy): TesseractOcrService, TextractOcrService, GcvOcrService.ParsingService: layout analysis, key-value detection, tables; optional LlmParsingService.TemplateService: vendor profiles, regex rules, learned mappings; local cache + optional remote sync.ValidationService: confidence scoring, anomaly detection, suggestions.ExportService: CSV writer (stable schema, locale normalization).MetricsService: capture confidence, errors, durations; local storage (SQLite/H2).DocumentPreviewService: render + zone overlays (PDFBox + image layers).Persistence: Spring Data (SQLite/H2 on disk) for runs, templates, audits.Config: Spring profiles (offline, cloud), YAML config for OCR provider keys, thresholds, CSV schema.UI layer:If JavaFX: Controllers get beans via Spring (custom SpringFXMLLoader), reactive updates via ApplicationEventPublisher.If Swing: @Component panels wired to services, event bus for updates.If Vaadin (embedded web): served by Spring Boot; package app with an embedded browser window.Key user flowsDrop files/folders → Ingestion queue (progress bar, cancel/retry).OCR + Parsing → Field map + line items + confidence per field.Review screen → Document preview with highlight boxes, editable fields, low-confidence badges, autocomplete from templates.Approve/Reject → Approved go to export queue; rejected capture reasons.Export → Single CSV or per-invoice CSV; schema versioning; logs.Analytics → Success rate, average confidence, common reject reasons, vendor leaderboard.CSV schema (stable, versioned)schemaVersion, fileId, vendorName, invoiceNumber, invoiceDateISO, dueDateISO, currency, subtotal, tax, total, poNumber, …Line items (denormalized or separate CSV): lineIndex, description, qty, unitPrice, amount.Locale-safe formatting (ISO dates, dot decimal).Offline/Cloud strategyOffline: Tesseract + local templates; everything runs without internet.Cloud (optional): switch OCR/LLM beans via Spring profile/env; graceful fallback to offline if unavailable.Packaging & opsDistribution: jpackage/native installers (Win/MSI, macOS/DMG, Linux/DEB/RPM) or fat JAR.Logging: Spring Boot logging; per-invoice audit trail; export logs.Updates: optional auto-update check (profile-gated).Security & privacyLocal processing by default; redact PII in logs; encrypted at-rest store (configurable).For cloud calls: minimal payloads, signed requests, regional endpoints.Nice-to-havesHot keys and batch review UX.Template “learn” button: convert manual fixes into a saved vendor rule.Import/export of templates.Headless CLI mode: --input dir --output csv.DeliverablesSource code (Spring Boot project + UI layer).Packaged desktop installer(s).Sample vendor templates & test invoices.README + setup, profiles, and OCR provider docs.Test suite (unit + a few end-to-end fixtures).Short user guide (drop → review → export).Qualifications Strong proficiency in Java and Spring Boot (DI, Spring Data, configuration, profiles).Experience building desktop UIs in JavaFX, Swing, or Vaadin (served by Spring) with responsive, user-friendly design.Skilled in troubleshooting, debugging, and performance tuning in Spring/Java.Familiar with OCR/AI integrations (Tesseract, Textract, Vision, OpenAI/Vertex) and robust parsing.Version control with Git; excellent communication; ability to work independently/remote.Bachelor’s in CS/Engineering (or equivalent experience).Freelance/contract experience is a plus.