Alex Bachlej
Alex Bachlej
I build backend systems
that prove they work.
Systems EngineerBackend InfrastructureAI Runtime Builder

A working demo environment for Clerk auth, Stripe test checkout, credits, jobs, ledger events, and controlled execution flows.

Live demo online
Auth + billing + jobs
All metrics from this environment
Live Demo EnvironmentLIVE

This site is also a working system.

Sign in, run jobs, buy test credits, and inspect the flow. Every metric below is from this live demo environment — not a mock, not a slide.

0
Jobs Today
0
Sessions
0
Active Jobs
100.0%
Pass Rate
8h
Uptime

All metrics from this live demo environment · uptime 8h

Demo execution path

Every step is real.

No mocked data. No fake flow. Clerk authenticates. Stripe processes. Backend writes. Ledger records.

01
Login
Clerk auth
02
Checkout
Stripe test
03
Credits
Granted
04
Run Job
Dispatched
05
Deducted
Credits −1
06
Ledger
Event logged
07
Dashboard
Visible
Capabilities

What I build.

Production-style backend systems, auth/payment flows, orchestration runtimes, and reliability-focused infrastructure.

Auth

Authentication & Authorization

Clerk JWT verification, protected routes, session management, and auth boundary enforcement.

Payments

Stripe & Billing Systems

Checkout sessions, webhook verification, credit grant flows, and test-to-production parity.

APIs

Backend APIs & Services

FastAPI/Python backends, typed contracts, structured error responses, and health observability.

Orchestration

Job Execution & Queues

Job dispatch, credit deduction, retry budgets, execution state tracking, and terminal reports.

Audit

Audit Trails & Ledgers

Immutable event records, credit ledger, execution history, and queryable audit evidence.

Operations

Deployment & Observability

Docker Compose stacks, env hygiene, healthchecks, rollback procedures, and pre-release audits.

AI Runtime

AI-Assisted Engineering

Bounded AI execution loops, operator-controlled runtimes, structured outputs, and evidence trails.

Reliability

Reliability & Verification

Gate policies, clean-clone coherence, secrets hygiene, and operator-readable release evidence.

Business value

What this means in practice.

Clients buy reduced risk, faster debugging, and clear proof — not abstract orchestration language.

01

Launch safer.

Auth, billing, credits, and jobs are verified before users touch them. Known boundaries before go-live, not discovered afterward.

02

Debug faster.

Every meaningful action leaves a trace: job state, ledger event, webhook result, runtime status. No forensic archaeology when something breaks.

03

Ship with rollback.

Changes are scoped, auditable, and reversible. Not "pray and deploy" — a structured path from commit to production with a defined way back.

04

Use AI without chaos.

AI can accelerate engineering work, but the system — not the model — decides what is allowed to reach production. Bounded execution, not unconstrained output.

Case Study / AI Runtime

RailTaskLite: rails for controlled AI execution.

A bounded runtime for AI-assisted engineering: batches, audits, gates, artifacts, rollback, and evidence. One operator decision point. Zero silent failures.

Batch
Audit
Gate
Artifact
Rollback
Report
Uncontrolled AI
Drift
Scope Creep
No Audit Trail
Lost Context
Production Switch
Controlled.
Auditable.
Shippable.
Batches.
Audits.
Gates.
Evidence.
Production reality

A green test suite is not
a release-ready artifact.

Tests pass. What about boundaries?

Clean-clone coherence, secrets hygiene, auth boundary enforcement, payment isolation — these are not tested by your unit suite.

Rollback is a system, not a plan.

Rollback that exists only in a runbook is not rollback. It must be scoped, documented, executable under pressure, and verified before the release.

Operator-readable evidence is not optional.

When something breaks at 2am, the operator needs a structured record: what ran, what produced it, what gate it passed, and how to undo it.

Engineering judgment
One API key.
Auth got weird.
Webhook broke.
Production had opinions.

The lesson: systems fail at boundaries, not slogans.

Layered assurance

Every execution is recorded.

Structured event logs capture each stage transition. Immutable audit records survive rollback and remain queryable after the session closes.

Gated release

Nothing ships without a gate.

Every artifact must pass the audit gate before promotion. Gates are typed policies enforced at the runtime layer — not manual steps subject to human error.

Reversibility

Sessions are reversible by design.

Rollback is a first-class operation scoped to a session boundary. Undo what was dispatched without touching what was not.

Ready to build something real?

Need a system that proves it works?

Backend infrastructure, payment and auth flows, AI runtime orchestration, and reliability reviews. See the live demo first — then talk.

Auth & authorization
Stripe & billing
Job orchestration
Audit & reliability