A fragile API makes every change risky.
Services have grown together. Shipping a small change means touching too much.
INDEPENDENT ENGINEER · PRODUCTION FIRST
Your product is live.Make the backendwork better.
Backend systems, payment flows, and integrations for products already in operation. I design the architecture and write the production code.
Architecture decisions. Production code. One hands-on engineer.
Gian BarbozaSenior Backend Engineer & Software Architect
Backend & APIsPayment flowsIntegrationsAutomation
01 / SERVICES
Less friction behind
the product.
Your product works. But the systems behind it may be slowing your team down. Start with the problem—not a predetermined stack.
Payment failures are hard to trace.
Providers behave differently. Your product needs a consistent way to handle them.
Your team is the integration layer.
Manual handoffs, repeated data entry, and workarounds are filling the gaps.
Backend & APIs
Build on what works. Improve what holds you back.
Architecture · API development · Integrations · Modernization
Depending on the challenge: a scoped architecture plan, production APIs, service integrations, or an incremental modernization path.
Payments & automation
Make the operational plumbing more dependable.
Provider integrations · Payment flows · Workflows · Automation
Depending on the challenge: a shared payment contract, routing and failure handling, or automated workflows with clear operational handoffs.
The engagement is scoped to your product. These are possible deliverables—not an all-inclusive package.
02 / SELECTED WORK
Decisions with a
production track record.
Three examples of the problems I have worked on—and the architectural decisions behind them.
From one server
to eight.
- Problem
- One server carried the whole system.
- Decision
- Move to an 8-server distributed architecture.
- Result
- 99.9% uptime sustained since 2019.
99.9%uptime since 2019
Read the case study: From one server to eight. Five providers.
One contract.
- Problem
- Multiple payment providers needed consistent integration.
- Decision
- Put five providers behind a shared contract, with configurable routing and failover.
- Result
- Five providers integrated through the same contract.
5 providersone shared contract
Read the case study: Five providers. One contract. New rules.
Less waiting.
- Problem
- Shipping a new fraud rule took weeks.
- Decision
- Use extensible fraud rules.
- Result
- Time to ship new rules reduced from weeks to hours.
Hoursinstead of weeks
Read the case study: New rules. Less waiting. 03 / HOW WE WORK
A clear scope.
A hands-on approach.
No fixed package before understanding the problem. We agree on the scope, tradeoffs, and handoff together.
Discuss the challenge
Understand your product, what is happening today, and the constraints that matter.
Define the approach
Agree on priorities, scope, technical decisions, and what a useful outcome looks like.
Build & validate
Implement the agreed work and validate it against the real operating context.
Deliver & hand off
Hand over code, relevant documentation, and the context your team needs to own it.
04 / START A CONVERSATION
What needs to
work better?
Tell me what your product does, what is happening today, and where you need help. A concrete starting point is enough.
For founders and product teams with a product already in operation.
Required fields are marked *.
A working product.
A better foundation.
Describe the problem behind the product. Let’s find the right next step.