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Backend reliability
APIs, payment workflows, queues, retries, and data models designed for real product constraints.
Available for [roles / freelance]
I build the systems behind ambitious digital products.
I'm Jecyline, a full-stack product engineer focused on backend reliability, system design, and AI-powered SaaS experiences.
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Selected work
Complex problems.
Clear systems.
[Add project image / recreated UI]01
AI SaaS · Flagship case study
A content engine that learns how users communicate
An AI workflow that analyzes connected social content and generates new posts aligned with each user's style and chosen topics.
Next.jsNode.jsMongoDBGCP
Read case study [Add project image / recreated UI]02
Payments · SaaS architecture
Flexible billing without fragile access control
A Stripe subscription system covering free, monthly, quarterly, and yearly plans alongside voucher-based promotions.
StripeNode.jsMongoDBWebhooks
Read case study [Add project image / recreated UI]03
Infrastructure · Reliability
Making bulk AI generation reliable under load
An asynchronous processing pipeline using Redis and BullMQ for high-volume content-generation workloads.
RedisBullMQNode.jsDocker
Read case study 02
How I work
Engineering with
product sense.
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System design
Practical architectures that balance scale, delivery speed, maintainability, and operational clarity.
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AI product integration
AI workflows shaped around user needs—from ingestion and personalization to generation at scale.
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Product engineering
End-to-end ownership across backend, frontend, cloud delivery, and thoughtful product decisions.
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Experience
Across industries.
Across the stack.
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[Add AI SaaS company name]
Node.js · Next.js · MongoDB · Redis · BullMQ
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[Add software house name]
Laravel · PHP · MySQL · AWS · [Add relevant frontend technologies]
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[Add banking company name]
Java · [Add framework] · [Add database] · [Add banking technologies]
Have a complex problem?
Let's make it
work beautifully.
I'm open to full-stack engineering opportunities and selected freelance projects.
Start a conversation