Fix the payments and financial integrations your software depends on.
I diagnose and repair Stripe, QuickBooks/ERP, OAuth, webhook, data-sync, and reconciliation failures in live B2B systems when money, data correctness, or customer operations are at risk.
Musah Abdulai · Backend & Integration Engineer
One customer · three systems
Stripe
subscription: active
Application DB
subscription: past_due
QuickBooks
invoice: not found
Bring me in when the systems disagree.
A payment succeeded, but the application still shows the wrong subscription state.
A webhook was missed, duplicated, delayed, or handled out of order.
QuickBooks or ERP synchronization stopped, duplicated records, or no longer ties out.
OAuth expiry or reauthorization silently broke a connection.
A backfill or migration changed financial or operational data unexpectedly.
The team cannot prove which system is correct or safely repair the affected records.
Repair the workflow, reconcile the data, verify the release.
I take responsibility for the failure from diagnosis through implementation and post-release verification: system mapping, root cause, code changes, targeted data repair, tests, observability, rollout, rollback, and handover.
Stripe and subscription-state repair
QuickBooks and ERP integration repair
OAuth, webhook, retry, idempotency, and background-job failures
Data synchronization, backfills, migrations, and reconciliation
Monitoring and operational handover for critical integrations
Known problem or unclear system?
Known problem
You can name the failure and the required outcome. I scope and quote the repair directly — no diagnostic friction for its own sake.
Unclear or high-risk problem
The system is inherited, the data may already be inconsistent, or the cause is unknown. Start with a fixed-scope, paid Integration Failure Diagnostic: failure map, affected data, containment, and a prioritized repair plan with a quote.
Prefer to write it down first?
Describe the problem by emailProof from systems I have actually built.
No invented case studies. The first item is a production SaaS product I founded, built, and operate; the rest is public and verifiable.
ClearWIP
A production financial-integration system I founded and operate: construction WIP reporting built around QuickBooks synchronization and Stripe billing. It is product and architecture proof — not a consulting case study — and it exercises the same failure modes this service repairs.
- QuickBooks authorization and synchronization
- Data mapping and provenance
- Retries, idempotency, and background processing
- Reconciliation and deterministic financial calculations
- Multi-tenant data boundaries
- Stripe subscriptions and billing
- Deployment, monitoring, backups, and recovery
Other high-risk changes to live software
Senior engineering for high-risk changes to live B2B software: payments, financial integrations, data migrations, production fixes, cloud handovers, security controls, and AI features.
Migrations & cloud handovers
Move live systems, data, accounts, and infrastructure with cutover, rollback, and verification.
Existing-app productionization
Harden inherited or AI-assisted applications that already have users, revenue, or a committed launch.
Cloud Controls
Implement technical control and evidence fixes when a security review, SOC 2 effort, or customer questionnaire creates the trigger.
AI Production Readiness
Fix data access, tool permissions, observability, failure handling, retention, and cost controls for live RAG or agent systems.
Who this is for
Good fit
- Existing B2B software with users, revenue, meaningful internal operations, funding, or a committed customer launch.
- A named payment, integration, migration, reliability, or production problem.
- You can provide repository, test, data, and infrastructure context safely.
- A problem where correctness, rollout, and recovery matter.
Not a fit
- Idea-only projects, equity-only work, and speculative MVPs with no budget.
- Simple API hookups or ordinary CRUD work that does not justify senior ownership.
- No access, no decision-maker, or a request to guess at production behavior from screenshots alone.
- The cheapest possible implementation regardless of verification or risk.
Faster implementation. Human accountability.
I use Codex and Claude Code extensively to accelerate investigation and implementation. I remain responsible for architecture, code review, test coverage, security, production access, rollout, rollback, and post-release verification.
Frequently asked
- Do I need a diagnostic first?
- No. If the problem and the required outcome are clear, I scope and quote the repair directly. The paid Integration Failure Diagnostic is for inherited systems, unclear causes, possibly-inconsistent data, or high production risk.
- What access do you need?
- Usually repository access, a safe test environment, relevant logs, and provider dashboards (Stripe, QuickBooks/ERP, cloud console), plus enough production context to verify behavior after release. Access is scoped at kickoff, and I never request secrets through ordinary messages.
- Can you fix historical data?
- Only after the affected records, source of truth, backup, and repair rules are agreed. Discovery establishes what is recoverable first — I do not promise complete recovery of unknown historical data up front.
- Do you work with AI-generated code?
- Yes. The relevant question is whether the system’s behavior, data boundaries, failure modes, deployment, and recovery are dependable — not how the first draft was produced.
- Do you offer ongoing support?
- When monitoring, incident response, integration changes, or operating responsibility justify it, I offer a defined support scope after the repair. It is optional, not a default retainer.
- Are you a SOC 2 auditor or penetration tester?
- No. The Cloud Controls service covers engineering remediation and evidence support for security reviews — not formal attestation, legal opinions, or a traditional pentest.
Tell me what is failing, what it affects, and what “fixed” needs to mean.
I'll take the call myself. 15 minutes. Clear yes or no after.