Agree the problem and scope.
Identify the affected workflow, required access, useful evidence and a clear definition of done. Confirm the price and deliverables before starting.
Payments · Backend · AI · Cybersecurity
Payments. Backend.Built to hold up.
I help teams integrate payments, strengthen backend
services, integrate AI, and assess application security.
PaymentsIntegrations & reliability
BackendAPIs & application security
AIProducts & automation
Services & starting prices / USD
Start focused.
Build with confidence.
Start with a focused audit or a clearly scoped piece of engineering work.
01 /
Focused technical audit
One component, one clear question. Review an agreed backend, payment, AI or application-security workflow, with up to four hours of analysis and a concise written report.
Evidence and observations · prioritised risks · recommended next steps
AUDITS FROM$400
02 /
Payment integrations & reliability
A scoped provider integration or improvement to an existing payment flow. Review webhooks, state transitions and duplicate-processing risks, then implement and test the agreed path.
One agreed integration or workflow · tests · handover notes
SCOPED WORK FROM$1,500
03 /
Backend implementation & improvement
One API, service integration, bug fix or performance bottleneck in Go or PHP/Laravel. Agree the affected path, implement the change and verify it with focused tests.
A defined change · tests · documented handover
SMALL TASKS FROM$1,000
04 /
AI integration & automation
One useful AI workflow connected to your product or internal tools: an assistant, document workflow, development tool or automation. Evaluate the result, access controls and operating cost.
One scoped pilot · evaluation examples · setup and handover
PILOTS FROM$1,500
05 /
Cybersecurity review & vulnerability research
A scoped manual review of application code, APIs, authentication or business logic. Investigate attack paths, document reproducible findings and define practical countermeasures.
Evidence-backed findings · risk priorities · remediation plan
SCOPED REVIEWS FROM$1,500
Agree the scope before work begins.
The $400 entry audit covers one agreed area. Implementation, broader testing and retests are quoted separately.
Starting prices cover limited engagements. Final deliverables, milestones, timing, taxes where applicable and third-party costs are confirmed in your proposal.
How we work
Direct collaboration.
Clear ownership.
Who you work with
Upserto is an independent engineering practice. You work directly with a backend tech lead with experience in fintech and iGaming systems.
Engagements focus on payment flows, service integrations, practical AI and application security. The work starts with your existing system and an agreed problem to solve.
Discuss your system ↗Make the change reviewable.
Share progress, explain decisions and verify the agreed behaviour with tests, traces or reproducible checks. Keep assumptions and remaining risks visible.
Leave a usable result.
Deliver the agreed code or report, supporting evidence and practical handover notes. Agree follow-up work when needed.
Start a conversation
Tell me what
needs to work.
Share the system, the problem and the outcome you need. We can start with a focused conversation and agree the scope before any work begins.
hello@upserto.com ↗01Understand the problem
02Agree scope and milestones
03Implement, verify and hand over