Custom processor engineering

A longer engagement that goes beyond advice. We design and implement a custom annotation processor for your codebase, hand it over with tests and documentation, and stay on call for revisions.

Typical engagements

• Security wrapper. @Secured, @RequiresRole, @RequiresPermission on service interfaces, generating compile-time-checked enforcement that calls through to your existing security context.
• Audit emitter. Annotations that mark methods producing audit-trail entries, with a processor that generates the wiring to your logging or SIEM pipeline. No runtime reflection on the audit path.
• Multi-tenancy guards. Per-method tenant-scope checks, derived from interface annotations. Build-time failure when new methods miss the annotation.
• Custom metrics & tracing. Method-level instrumentation that emits to OpenTelemetry, Micrometer, or your existing metrics infrastructure — without weaving an agent into the JVM.

How an engagement is shaped

1. Scoping (1–2 days, fixed price). Discovery call, requirements walk-through, decision on processor design. Output: a one-page brief that defines the annotation surface, the generated-code shape and the acceptance criteria.
2. Implementation (sprint-sized, fixed price or weekly retainer). The processor is built against your codebase. Tests run as part of your normal build. Code reviews go through your usual channels.
3. Hand-over. Documentation written in your team’s idiom — README, architecture decision record, contributor guide. Walk-through with the team that will own it going forward.
4. Optional retainer. Two to eight hours a week, ongoing, for follow-up questions, processor extensions, version bumps.

Deliverables

• The processor source code, in your repository, under your licence.
• A working test suite that exercises the processor against representative interfaces.
• Documentation: how to use the annotation, how the generator works, how to extend it later.
• Optional: a short internal talk to onboard the wider engineering team.

Logistics

• Pricing: Scoping is fixed-price (€1,500–€3,000 depending on complexity). Implementation is fixed-price after scoping, or weekly retainer at €4,500/week for 4-day weeks.
• Confidentiality: Source-level access under NDA. Code can be developed in a private branch you own; you control merge.
• Lead time: Scoping typically starts within two weeks. Full engagements start two to six weeks after scoping concludes.