AI Development
Hybrid Search & Reranking Services
We improve retrieval quality using hybrid search and reranking: higher recall, better relevance, fewer misses, and measurable tuning for RAG assistants and semantic search products.
Overview
What this service is
Hybrid retrieval combines keyword and vector search so you get both exact-match precision and semantic recall for messy real-world queries.
Reranking improves relevance by scoring candidate results more carefully, reducing wrong context that causes poor answers in RAG systems.
We tune retrieval using a query set and metrics, then harden latency and caching so quality gains don’t create performance regressions.
Benefits
What you get
Higher recall for long-tail queries
Find relevant context even when users don’t use the exact same wording as your documents.
Fewer hallucinations in RAG
Better context selection reduces wrong answers caused by irrelevant or missing sources.
Better ranking for mixed content
Hybrid retrieval handles structured docs, FAQs, and long-form PDFs with stronger relevance.
Measurable quality improvements
Tuning is validated against a dataset so changes are repeatable and trackable.
Latency-aware design
Caching and query optimization keep response time fast as traffic grows.
Features
What we deliver
Hybrid retrieval implementation
BM25 + vector search composition, weighting, and query expansion for better recall.
Reranking integration
Cross-encoder or LLM-based reranking with thresholds and explainable diagnostics.
Metadata filters
Filters for doc type, product version, tenant/team boundaries, and access control patterns.
Retrieval evaluation
Query sets and metrics for relevance and coverage, with regression checks over time.
Latency optimisation
Candidate limits, caching, and batching strategies to keep retrieval fast and cost-aware.
Debug tooling
Expose retrieved chunks and scores so teams can inspect why an answer happened.
Process
How we work
Baseline + dataset
We gather sample queries and define retrieval metrics for your success criteria.
Hybrid retrieval build
We implement hybrid retrieval and filters on your chosen search + vector stack.
Reranking + tuning
We integrate reranking and tune weights/thresholds against your dataset.
Latency hardening
We optimize and add caching so quality improvements don’t slow responses.
Tech Stack
Technologies we use
Core
Tools
Use Cases
Who this is for
Support knowledge search
Improve recall and relevance across product docs, FAQs, and troubleshooting guides.
Internal policy assistants
Rank the right policy excerpt first, with filters for department and document version.
Product documentation copilots
Retrieve the most relevant sections from long docs and reduce wrong-context answers.
Search across PDFs
Handle long, noisy PDFs with hybrid retrieval and reranking tuned for real queries.
Multi-tenant RAG systems
Prevent cross-tenant leakage using strict filters combined with relevance scoring.
FAQ
Frequently asked questions
Not always. For many domains, hybrid retrieval improves recall significantly, especially when users ask in varied language or include product codes and exact terms.
It depends on constraints. We can use smaller rerankers for speed, or higher-quality reranking where accuracy is more important than latency.
It often does, because better retrieval reduces wrong context. We also recommend evals and guardrails for end-to-end reliability.
Yes. We expose retrieved chunks and scores so teams can debug and tune retrieval behaviour.
Yes. We can improve retrieval on top of your current ingestion and vector DB setup with minimal disruption.
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Regional
Delivery considerations for your region
Compliance & Data (UK/EU)
For UK teams, we default to GDPR-first thinking: data minimisation, purpose-limited storage, and clear access boundaries.
We can work under a DPA (template available on request) and implement practical retention/deletion flows when needed.
- GDPR-first patterns (minimise, restrict, document)
- DPA template available on request
- Retention/deletion and export flows where required
- Least-privilege access and secure session handling
- PII-safe logging + secure-by-default configuration
- NDA available for early-stage discussions
Timezone & Collaboration (UK/EU)
We align to UK time and EU overlap (GMT/BST with CET-friendly windows) for fast feedback cycles.
We keep the process lightweight: async updates, clear priorities, and written decisions to avoid ambiguity.
- UK/EU overlap with GMT/BST windows
- Async-first delivery with documented scope
- Weekly milestones and structured demos
- Clear escalation path for blockers
- Tight change control with clear sign-offs
Engagement & Procurement (UK)
We support typical UK procurement flows with clear scopes, change control, and invoice cadence.
If you prefer a discovery-first engagement, we can run a short paid discovery to lock requirements before build.
- GBP-based engagements and invoicing options
- Discovery-first option to reduce delivery risk
- Milestone-based billing when appropriate
- Transparent change control and sign-offs
- Vendor onboarding pack on request
Security & Quality (UK/EU)
We build for reliability and maintainability: clean PRs, tight review loops, and test coverage that matches risk.
Performance budgets and release checklists keep launches predictable—especially when multiple stakeholders review changes.
- CI-friendly testing: unit + integration + smoke tests
- Performance budgets + bundle checks (Core Web Vitals-minded)
- Structured release notes and rollback-safe deployments
- Security checklist for auth, roles, and data flows
- Observability hooks (logs + error tracking) ready for production
Want better retrieval without guesswork?
Share your queries and content—we’ll tune hybrid search and reranking with an eval set and measurable targets.
Eval-driven improvements.