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Our engagements

Three doors in: integrate payments, modernize a backend, or build greenfield. Every engagement starts with a 45-minute technical discovery and a written proposal within 48 hours.

Advisory

Audit, architecture, performance, security — a scoped mission

API & integration audit

3 to 5 working days

We review your APIs, authentication, timeouts, retries, webhooks, idempotency, logs, and monitoring. You leave with a Technical Integration Report: problems, risks, quick wins, target architecture, roadmap.

  • Map of API contracts and breaking points
  • OAuth2 / JWT, errors, timeouts, and retries
  • Webhooks, idempotency, logs, and observability
  • Integration report and prioritized roadmap

Guarantee If the report teaches you nothing, we do not invoice.

Payment Architecture Audit

3 to 7 working days

From payment request to settlement: API, provider, webhook, transaction, ledger, reconciliation. You get an Architecture Assessment, a Risk Map, and a Technical Roadmap — plus a Payment Reliability Score.

  • Reliability score by domain, out of 100
  • Duplicate payments, replayed webhooks, inconsistent states
  • Quantified loss and double-charge risks
  • Remediation plan prioritized in days

Guarantee If the report teaches you nothing, we do not invoice.

Architecture review

3 to 5 working days

Current state, problems, risks, target architecture, migration roadmap. We work on your code, diagrams, and infrastructure — not a generic slide.

  • C4 model and target architecture diagram
  • ADRs and architecture principles
  • Prioritized technical risks
  • Migration roadmap

Production reliability audit

5 working days

Timeouts, retries, circuit breakers, observability, high availability, runbooks. You leave with a Production Reliability Report — what will break, how you will know, and how long recovery takes.

  • Timeout, retry, circuit breaker, rate-limiting review
  • Logs, metrics, traces, and alerts
  • Failure scenarios and MTTR estimate
  • Runbooks and remediation plan

API security audit

3 to 5 working days

OAuth2, JWT, RBAC, API gateway, secrets, webhook authentication, OWASP API Security. Findings ranked Critical / High / Medium / Low, with a remediation plan.

  • Authentication and authorization review
  • Webhook and secrets security
  • Findings ranked by severity
  • Prioritized remediation plan

Performance engineering

1 to 3 weeks depending on scope

Reduce response time and increase platform capacity: baseline, profiling, bottleneck identification, optimization, load testing, validation.

  • Latency, throughput, and error baseline
  • CPU, memory, query, and Kafka-lag profiling
  • Fixes prioritized on real bottlenecks
  • Validation with a load test

Reconciliation diagnostic

3 working days

We take one month of your real data — operator exports on one side, application transactions on the other — and produce the match. You get the exact gap and its origin.

  • Quantified gap statement
  • Identified causes
  • Affected volume

Go-live readiness review

5 working days

Before production: load testing, operator-outage scenarios, recovery plan, go-live checklist.

  • Load-holding report
  • Cutover plan
  • Blockers

Technical due diligence

2 to 3 days

For investors and acquirers: an independent assessment of architecture, technical debt, and execution capacity of a financial-sector target.

  • Structured report
  • Risk level by domain
  • Estimated remediation cost
  • Debrief to the investment committee

In-house training

2 days, on your premises

Integrate payments, secure an API, observe production — two days with your technical team, on your own cases.

  • Training materials
  • Exercises on your code
  • Action plan at the end

Engineering

API, backend, integration, payments, cloud — a delivered project

Backend Modernization Sprint

3 to 8 weeks depending on scope

Modernize legacy backend systems without breaking production: stack upgrades, modularization, API redesign, event pipelines, observability, resilience and cloud readiness. Deep JVM/Spring expertise — and pragmatic work on Node, Python and polyglot architectures when that is what production requires. Not a big bang. A path your teams can follow.

  • Stack modernization (JVM, Node, runtime & framework upgrades)
  • Modularization and API redesign
  • Resilience, tests, CI/CD
  • Observability before and after cutover

Multi-rail payment integration

3 to 5 weeks

Wave, Orange Money, Free Money, card, bank transfer — wired cleanly into a single architecture.

  • Idempotent webhooks that survive replay
  • State machine with automatic recovery on failure
  • Logging traceable transaction by transaction
  • Test environment, documentation, and handover

Payment Integration Sprint

2 to 4 weeks

Integrate a PSP, mobile-money rail, or payment rail into an existing platform: architecture, APIs, webhooks, idempotency, retries, transaction state machine, reconciliation, monitoring, tests, documentation.

  • Rail integration without breaking what works
  • Idempotent webhooks, retries, and state machine
  • Reconciliation, monitoring, tests, and handover

Emergency — lost transactions

Start within 48 hours

Payments collected on the operator side but missing from your system. Customers charged twice. We step in.

  • Cause identified
  • Fix deployed
  • Exact list of transactions to regularize

Ledger and automated reconciliation

4 to 8 weeks

The system that tells you, every morning, exactly how much you collected.

  • Double-entry ledger in XOF, append-only and auditable
  • Automatic matching of operator statements
  • Fees, commissions, and settlement delays handled per rail
  • Invoices compliant with legal mentions and SYSCOHADA
  • Exception dashboard

Multi-PSP orchestration layer

6 to 10 weeks

One API for your teams, several providers behind it, with smart routing and automatic failover when an operator goes down.

  • Configurable routing engine
  • Automatic failover
  • Compared success rates by provider
  • Documented unified API

Wallet system

8 to 12 weeks

Customer accounts, balances, deposits, withdrawals, internal transfers — on an auditable ledger.

  • Double-entry account engine
  • Deposit, withdrawal, and transfer operations
  • Auditable history
  • Admin interface

Managed engineering

Maintenance, observability, evolution — a subscription

Manarix Engineering Care

Monthly subscription, no minimum term

After an engagement: monitoring, fixes, small evolutions, architecture review, security, performance, and support during business hours.

  • Supervision and alerts
  • Fixes and small evolutions
  • Monthly technical review
  • Response during business hours

Fractional Architecture

Monthly retainer, no minimum term

A senior architect inside your team, without hiring one: architecture, backend engineering, payment integrations, code review, technical roadmap, mentoring, production support during business hours.

  • Architecture and backend engineering
  • Payment integrations and code review
  • Technical roadmap and mentoring
  • Production support during business hours

Maintenance and evolution

Annual retainer proportional to the covered scope

Fixes, adaptations to operator API changes, small functional evolutions.

  • Fixes on the covered scope
  • Adaptations to operator API changes
  • Small functional evolutions

What we do not do

Out of scope:

  • Brochure websites and content projects
  • Monthly staff augmentation
  • RFPs that require permanent on-call or a team of more than five
  • Equity in exchange for development

45-minute technical discovery

Let's build the infrastructure behind your next stage of growth.

A written proposal within 48 hours, after a 45-minute technical discovery.