About CryptoPust
Backend engineering without the ceremony.
CryptoPust exists for technically difficult backend work: production failures, integrations, architecture problems, unreliable systems and narrowly scoped engineering problems that benefit from senior technical judgment.
CryptoPust is an engineering brand operated by FintechBear LLC.
01 / Engineering approach
Practical decisions for systems that need to hold up.
- Simple systems where possible.
- Explicit failure behavior where necessary.
- Production behavior matters more than architecture diagrams.
- Tests should prove important system behavior, not merely increase coverage numbers.
- External integrations should be treated as unreliable boundaries.
- AI-assisted engineering can accelerate implementation and analysis, but architecture, technical judgment and final review remain human-led.
02 / Engineering judgment
AI-assisted, human-reviewed
Modern engineering tools can accelerate implementation, investigation, testing, and review. I use them where they are useful.
They do not replace engineering judgment.
Architecture, failure modes, security boundaries, production risk, and final technical decisions remain human-reviewed.
03 / Technical focus
The systems and boundaries in scope.
- Backend systems
- Laravel / PHP
- .NET
- APIs and integrations
- Payments
- PostgreSQL / relational data
- Redis
- Queues and background processing
- Docker
- Production debugging
04 / Engagement model
Focused work for a defined technical problem.
CryptoPust is intended primarily for focused engineering engagements rather than long-term staff augmentation.
- Production RescueDiagnose and fix production-critical backend failures.
- Backend AuditReview architecture, authorization, data access, performance, security and production readiness.
- API & Integration WorkThird-party APIs, payments, webhooks and backend integrations.
- AI Code RescueTurn AI-assisted or vibe-coded applications into maintainable, testable systems.
- Feature SprintAdd a clearly scoped backend capability without long-term staff augmentation.
- Architecture ReviewIndependent technical review of architecture, failure modes and implementation decisions.
05 / Who you work with
Ekin Yegül
CryptoPust is run by Ekin Yegül alone.
My engineering career began in 2004. My work has covered software development, architecture, infrastructure, production operations, and technical leadership across software, electronics, and embedded systems.
From June 2024 to March 2026, I served as CTO of an electronic money institution. My responsibilities included software architecture, infrastructure, cybersecurity, production operations, regulatory readiness, reporting, third-party technical relationships, and engineering delivery.
I am currently building FintechBear, a financial software infrastructure product company. Selected fixed-scope engineering work is provided separately through CryptoPust.
Some previous projects cannot be described publicly because of confidentiality obligations.
06 / Operating entity
What CryptoPust is, and who operates it.
CryptoPust is an engineering brand for focused backend work: production failures, integrations, architecture problems, and narrowly scoped technical problems.
FintechBear LLC is the operating legal entity behind the brand. That does not imply a large team, staffed agency, or multi-person delivery bench.
Accepted work is technical and bounded. Examples that can be inspected directly are published under Work, including RescueBench and Lootwright.