Talent.com
No longer accepting applications
Java Desktop Developer (Freelance short term project)

Java Desktop Developer (Freelance short term project)

Invito Staffing SolutionsNagpur, IN
1 day ago
Job description

Company Description

Invito 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 build

  • Desktop Java application (Java 17+) backed by Spring Boot
  • Runs 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, or
  • Cloud OCR (AWS Textract, Google Vision) with retry / backoff, or
  • LLM-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 flows

  • Drop 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 strategy

  • Offline : Tesseract + local templates; everything runs without internet.
  • Cloud (optional) : switch OCR / LLM beans via Spring profile / env; graceful fallback to offline if unavailable.

    • Packaging & ops

  • Distribution : 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 & privacy

  • Local processing by default; redact PII in logs; encrypted at-rest store (configurable).
  • For cloud calls : minimal payloads, signed requests, regional endpoints.

    • Nice-to-haves

  • Hot 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.

    • Deliverables

  • Source 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.
    • Create a job alert for this search

    Java Developer • Nagpur, IN