Contact person: Greek Football Analytics/Prediction Website Development

Phone:Show

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Location: Rodos, Greece

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"RFP — Build [login to view URL] (Greek Football Analytics & Predictions)
1) Purpose & Outcomes

Build a production-grade football analytics platform for [login to view URL] that:

runs a modern membership site (Greek-first),

ingests trusted match data,

produces calibrated probabilities (1X2, Over/Under), and

generates Greek AI narratives grounded in our stored data.
Success = fast on mobile, reliable, GDPR-compliant, explainable, and easy for editors.

2) Core Scope (Greek-first + Homepage)

Greek-first UX: WordPress locale el_GR; all public strings, emails, dates (e.g., «Κυρ, 21:30») in Greek. i18n for all plugin strings; inLanguage:"el" in schema. Admin may view English; public stays Greek. Architecture ready for future bilingual without breaking structured data.

Homepage “Σημερινοί Αγώνες”: Shows today’s fixtures (timezone Europe/Athens). Resets after local midnight; live window auto-refresh (−30′ to FT) with graceful fallback to cache under throttling. Cards: kickoff (localized), league, teams/logos, status/score, our 1X2 & O/U probabilities (with confidence), and “Γιατί αυτή η πρόβλεψη;” if the tier allows. Editors can choose leagues, pin Top Picks, optionally include late-night “tomorrow”, pick compact/expanded layout. Provide Gutenberg block/shortcode, server-rendered (SEO) + JSON endpoint for live updates. Cache keys must include date, league set, user tier, language. Handle no-fixtures, postponed/abandoned, DST.

3) Membership & Payments

Tiers: Free / Standard / Premium with fine-grained gating (live probs, late updates, CSVs). Registration, email verify, login, reset, profiles. Stripe for one-off/monthly/annual, EU VAT, proration, upgrades/downgrades, cancellations; webhook-driven entitlements. Optional Google/Apple OAuth. Full GDPR: consent banner, privacy policy, data export/delete.

4) Data Providers & Ingestion

Start with API-Football (key available). Abstract provider layer so SportMonks, etc., can be added later. Scheduled imports on Europe/Athens: leagues, teams, fixtures, odds, results, standings. Resilience: token-bucket rate limiting, retries with exponential backoff + jitter, idempotent jobs, strict schema validation, quarantine of malformed payloads. Audit trail of provider/updated_at/source id. Store in custom tables (not postmeta) with proper indexes.

5) Predictions (Numbers first; AI second)

Compute and store probability distributions per match for 1X2 and standard O/U lines.

Baseline model (justify): e.g., Dixon-Coles/Poisson or Elo-strength with bookmaker odds as priors; features include recent form, injuries, congestion.

Track Brier & log-loss; show reliability diagrams (calibration).

AI narratives in Greek via OpenAI: strictly consume our structured inputs (recent results, xG if available, absences, weather). Guardrails: low temperature, numeric binding/placeholders, JSON-schema validation, moderation. Model-disagreement flag suppresses “confident” labels if narrative intent diverges from numbers beyond a threshold.

6) Compliance (EU)

18+ disclaimer; responsible gambling; “past performance is not indicative”; configurable jurisdiction blacklist. Moderate UGC to block illegal promotion. Emails: opt-in, unsubscribe, authenticated sending (SPF/DKIM/DMARC).

7) Admin & Editorial

Dashboard: today’s fixtures, ingestion health, job queue, model status, cache warmth, subscription metrics. Editors can re-ingest a league, re-run predictions, regenerate AI from templates (tone/length toggles) without seeing secrets. CSV exports for predictions/performance. Structured logging with correlation IDs; clear error surfaces.

8) Performance & Reliability

Meet mobile p75: LCP ≤2.5s, INP ≤200ms, CLS ≤0.1. Full-page cache + Redis object cache, avoid N+1, precompute heavy blocks, CDN + image optimization. Secrets via env vars. Staging + Production with separate keys; repeatable DB migrations. Daily automated backups (DB+uploads). Health-check endpoint (DB/cache/provider ping). Uptime monitoring.

9) SEO & Accessibility

Clean URLs, XML sitemaps, canonical tags, [login to view URL] for SportsEvent, SportsOrganization, Article. Server-rendered widgets; client hydration for live data. WCAG 2.1 AA (keyboard navigation, ARIA).

10) Architecture & Data Model (indicative)

Stack: WordPress, custom plugin for logic; Action Scheduler for jobs; WooCommerce or MemberPress + Stripe; provider abstraction in PHP; Redis; lean theme. A modeling microservice (Python + FastAPI) is acceptable only if containerized, observable, and integrated via signed REST/webhooks.
Tables: xs_leagues, xs_teams, xs_fixtures (kickoff_at_tz, status, provider_ref…), xs_odds, xs_predictions (market, selection, prob, model_version), xs_model_runs (inputs_hash, metrics_json), xs_ai_summaries (lang, text, moderation_status), xs_import_audit.
Cache keys include date/league set/tier/language; warm at 00:05 Athens; invalidate narrowly on upstream changes.

11) Deliverables

Code (plugins/theme) in our Git repo; in-dashboard config UI; infra scripts/docs; technical docs (data model, schedules, APIs); editor handbook (Greek UI); automated tests (ingestion transforms, model calc, permissions); 30-day warranty.

12) Milestones & Acceptance (10; each must deploy to staging)

M1 Discovery & Architecture — Scope, leagues/seasons, backfill depth, GDPR posture, cache-key & schema drafts.
Accept: Signed architecture; fixed backfill decisions; unambiguous cache-keys/schemas.

M2 DevOps & Scaffold (Greek-first) — Repos, CI/CD, staging/prod, hardened WP, plugin scaffold, env/secret mgmt, text domain el_GR.
Accept: One-click staging deploy; health-check passes; public strings load in Greek.

M3 Data Model & Admin Shell — Custom tables, migrations (with rollback), capability model, dashboard shell.
Accept: Fresh install/upgrade idempotent; Editor loads dashboard error-free.

M4 Provider Integration (API-Football v1) — Provider abstraction; Athens-aligned schedules; rate-limit/retry/audit; incremental sync.
Accept: Auto-ingest selected leagues; idempotency proven; throttling sim ok; timestamps localized.

M5 Front-End & Today’s Matches (Alpha) — Server-rendered fixtures; homepage block + JSON; caching with date/league/tier/lang.
Accept: Correct Athens-day fixtures; cache warmed at 00:05; live refresh degrades gracefully.

M6 Membership & Payments (Greek) — WooCommerce/MemberPress + Stripe (EU VAT), tiers, webhooks, OAuth optional, GDPR flows, Greek emails.
Accept: Purchase→entitlement→cancel ok; webhook SLA; no premium leakage; localized emails.

M7 Baseline Model & Backfill — Implement model; store distributions; backfill N seasons; metrics pipeline.
Accept: Brier beats coin-flip by agreed margin on held-out; reproducible by model_version.

M8 AI Narratives (Greek) + Safeguards — Templates, numeric binding, schema validation, moderation, model-disagreement flag; editor controls.
Accept: 20 audited fixtures: zero fabricated numbers; facts only; flags trigger correctly.

M9 UX Polish, Widgets & Exports — League dashboards, team pages, richer cards; CSV endpoints; editor tools; terminology guide.
Accept: Editors perform tasks without secrets; CSVs verify; ≥90% Greek string coverage; no N+1 on key pages.

M10 Hardening, Perf, Compliance & Handover — Core Web Vitals, WCAG AA, [login to view URL] validation, CDN/images, monitoring/alerts, backup+restore test, final docs.
Accept: Lighthouse mobile targets met; accessibility checks pass; structured data validates; restore test succeeds; warranty starts.

13) Mandatory Developer Criteria (must-haves — no compliance → no payment)

WordPress engineering (5+ yrs): custom plugins (OOP, hooks, nonces), secure DB ($wpdb->prepare).

PHP 8.1+ & SQL: custom tables, indexing, migrations with rollback; avoid postmeta bloat.

Async jobs: Action Scheduler, idempotent tasks, exponential backoff, locking.

Caching/perf: Redis, full-page caching, Core Web Vitals, no N+1, SSR + hydrate.

Payments/membership: Stripe (EU VAT, proration, webhooks), WooCommerce/MemberPress.

Sports APIs: API-Football or similar; rate limits, pagination, normalization.

OpenAI/LLM: prompt design with numeric binding, schema validation, moderation, logging.

Security/GDPR: OWASP Top-10, CSRF/XSS, roles/caps, webhook signatures, data export/delete.

i18n/l10n: shipping Greek translations; gettext workflow.

Testing & CI: PHPUnit + browser tests; PHPCS/WPCS; CI gates.

DevOps: Docker, env parity, health checks, logs/observability.

Docs & Handover: technical docs + Greek editor handbook; clear runbooks.

Payment condition: Failure to meet any Mandatory Criterion during a milestone blocks payment for that milestone until remedied. Persistent non-compliance allows termination for cause with no payment for that milestone.

14) Preferred (nice-to-have)

Python + FastAPI microservice; experience with Dixon-Coles/Elo; accessibility audits; sports structured data.

15) Proposal Requirements

Map your approach to each milestone with risks/mitigations; show evidence for each Mandatory Criterion (links or code samples); baseline model choice & features; sample OpenAI prompt + schema; timeline & fixed price per milestone.

16) Contract Terms

Acceptance-gated payments: payable only on written acceptance vs. milestone criteria. No partial acceptance unless agreed.

Warranty: 30 days after go-live; critical security patches ≤72h.

IP: work-for-hire; original or properly licensed code; third-party licenses disclosed.

Data: GDPR; production data only in prod; sanitized data in staging; secrets handled safely.

17) Pre-Start Clarifications (answer before M1 sign-off)

Launch league list & historical backfill depth (e.g., 3–5 seasons).

Target Brier/log-loss thresholds; evaluation windows.

Exact entitlements per tier & CSV access.

Final cache-key formats + invalidation rules.

Provider quotas; webhook entitlement SLA.

Greek terminology style guide process.

Whether a modeling microservice is justified; ops/monitoring plan." (client-provided description)