Fragile integrations
API and webhook workflows fail silently, duplicate work, or depend on inconsistent external payloads.
VANTABLADE / ENGINEERING
Reliable backend systems for messy data, APIs, and AI workflows.
Python and FastAPI engineering for API integrations, data pipelines, PostgreSQL applications and controlled AI workflows. Available for fixed-scope projects, urgent repairs and agency subcontracting.
Python · FastAPI · PostgreSQL · Supabase · REST APIs · OpenAI integrations
Python + FastAPI
APIs + Webhooks
PostgreSQL + Supabase
Data Reliability
Controlled AI Workflows
Automated Testing
Failure modes
Where engineering workflows break.
Unreliable data
Records arrive incomplete, malformed, duplicated, or shaped differently across providers.
Operational bottlenecks
Manual transfers and disconnected systems consume time and create avoidable errors.
Unsafe automation
AI workflows take action without sufficient validation, review boundaries, or auditability.
Unclear failure handling
Errors are discovered after downstream systems have already received incorrect state.
What we build
Engineering services built around operational reliability.
Python and FastAPI backend development
REST API and webhook integrations
Data intake, validation, and normalization
Deduplication and idempotency controls
PostgreSQL and Supabase workflows
Controlled OpenAI integrations
Human-review and approval boundaries
Backend debugging and workflow repair
Automated testing and technical documentation
Technical proof
Reliable Data Intake Pipeline
Public proof asset
A production-minded FastAPI project demonstrating how inconsistent multi-provider data can be validated, normalized, deduplicated and routed safely.
- Three provider-adapter implementations
- Pydantic validation and canonical normalization
- Identity matching and review routing
- SHA-256 fingerprints and duplicate prevention
- Idempotent request handling
- Controlled API failures
- PostgreSQL-compatible relational design
- 16 passing automated tests
Deterministic intake path
Providers
Adapters
Validation
Normalization
Identity Resolution
Accepted / Review / Rejected
Persistence
ENGAGEMENT MODELS
Choose the right starting scope.
Start with a bounded problem and a written scope. Every engagement defines the deliverables, acceptance criteria, timeline and price before implementation begins.
Backend Repair Sprint
$250–$750
Typical delivery: 1–3 business days
A bounded repair for one urgent backend, API, webhook, import or database problem.
Includes
- Root-cause investigation
- One agreed repair scope
- Validation and regression testing
- Error-handling improvements where applicable
- Concise technical handoff notes
Scope boundary
Full rebuilds and unrelated feature development are quoted separately.
Fixed-Scope Integration
$750–$2,500
Typical delivery: 3–10 business days
One clearly defined integration or data workflow delivered against agreed acceptance criteria.
Includes
- API or provider integration
- Data mapping and validation
- Database or Supabase/PostgreSQL workflow
- Deduplication and failure handling
- Automated tests
- Technical documentation and handoff
Scope boundary
Third-party subscriptions, open-ended product development and major frontend work are excluded unless explicitly quoted.
Agency Engineering Partner
From $1,500/month
Ongoing reserved support
Backend implementation support for agencies and operators that need reliable engineering behind client-facing automation.
Includes
- Subcontracted backend delivery
- API and database integrations
- Integration hardening
- Exception handling
- Automated testing
- Technical documentation
- Clear delivery updates
Scope boundary
Monthly capacity, response expectations and deliverables are agreed before work begins.
HOW IT WORKS
A clear path from problem to delivery.
Share the problem
Provide the current system, desired result, urgency and relevant constraints.
Receive a written scope
The deliverables, exclusions, acceptance criteria, timeline and price are defined before work begins.
Build and validate
Implementation includes appropriate testing, failure handling and progress updates.
Review and handoff
Receive the completed work, technical notes and any agreed follow-up support.
FAQ
Questions before we scope the work.
How is payment structured?
Projects below $500 are paid before implementation begins. Larger fixed-scope projects are typically 50% upfront and 50% after agreed acceptance criteria are met. Monthly engineering partnerships are paid at the beginning of each service period.
Can you work with international clients?
Yes. Remote international contract and subcontracting engagements are welcome, subject to payment and contracting compatibility.
What information should I provide?
Describe the problem, current technology, desired outcome, urgency and any known constraints. Never submit passwords, private keys or production credentials through the inquiry form.
Do you offer hourly work?
Engagements are normally scoped around outcomes and deliverables. Hourly or reserved-capacity arrangements may be used when requirements cannot be defined reliably in advance.
Who owns the completed work?
Ownership and repository access are defined in the written scope. Client-specific code is treated as confidential and is not published without permission.
Can you work inside an existing codebase?
Yes. Repair, integration and agency engagements can be completed within an existing repository when appropriate access, documentation and environment details are available.
What happens if the scope changes?
Material changes are documented and quoted before additional work begins. No unapproved work is added silently.
VANTABLADE / NEXT ACTION
Bring the backend problem. Leave with a defined next step.
Book a short engineering scope call to determine whether the problem fits a repair sprint, fixed integration or ongoing partnership.