Job VC

Please attach a brief message describing
your hands-on experience with Kafka, PostgreSQL,
and
asynchronous programming
. If you have experience in
fintech
or
payment systems,
please mention it.
Last but not least, we’d appreciate learning
if you use AI in your daily work
and
why/how.
Highlighting your relevant experience will help us prioritise your application. You can write the message in Ukrainian, Russian or English.

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We are building a high-load payment platform (PSP) processing transactions 24/7/365 across multiple regions and providers.
Our stack:
.NET 9
Apache Kafka
PostgreSQL
Redis / Valkey
The platform is built around event-driven architecture with real production requirements for:
delivery guarantees
idempotency
resiliency
observability
fault tolerance
This is not a CRUD product role.
You will work on infrastructure-critical systems directly impacting transaction reliability and routing efficiency.
What you’ll do
Develop and evolve the core payment platform:
transaction flows
routing engine
webhook infrastructure
provider integrations
Design new services and integrations — from architecture and contracts to production rollout
Participate in architecture discussions and technical decision-making
Perform code reviews and contribute to engineering standards
Work closely with the connectors team (Python / TypeScript)
What we expect
Platform & Backend
Strong senior-level experience with:
C#
.NET 8/9
ASP.NET Core
Deep understanding of:
async programming
concurrency patterns
thread-safety issues
Production experience with:
Minimal APIs
Hosted Services
Dependency Injection
Infrastructure & Data
Hands-on Apache Kafka production experience:
at-least-once delivery
consumer groups
manual offset commits
idempotent consumers
Strong PostgreSQL knowledge:
SQL-first mindset
query optimization
execution plan understanding
Experience with Redis / Valkey:
caching strategies
invalidation patterns
Sentinel or Cluster setups
Architecture
Experience building microservices with event-driven communication
Strong understanding of:
inbox/outbox patterns
delivery guarantees
idempotency
Docker production experience

Understanding of container orchestration:
Docker Swarm
Kubernetes is also relevant
Payments / Fintech Domain
Experience in fintech or payment systems
Understanding of:
PayIn / PayOut flows
webhooks
callbacks
retry cascades
Production experience with webhook security:
HMAC signatures
replay protection
timestamp validation
Practical understanding of PCI DSS scope:
sensitive data handling
logging restrictions
secure storage practices
Quality & Observability
Ability to properly test critical business logic
Understanding of:
unit tests
integration tests
Experience with observability tooling:
structured logging
metrics
distributed tracing
AI-Assisted Engineering
AI-assisted development is a standard part of our engineering culture.
We expect engineers to confidently use tools like:
Claude Code
Cursor
GitHub Copilot
or equivalent AI assistants
Important:
You fully understand every line of code you commit
You do not blindly trust generated code
You know how to properly structure prompts, context, and acceptance criteria
You understand where AI accelerates delivery — and where manual engineering judgment is required
Nice to have
Lua / LuaJIT experience
OpenAPI-first development
openapi-generator experience
Python or TypeScript background
Hot-reload configuration systems via event buses
Real production experience with Git submodules
Why join us
* High-load real-world fintech infrastructure
* Complex engineering challenges instead of routine CRUD
* Direct impact on platform scalability and transaction reliability
* Strong engineering culture with modern tooling and AI-first workflows
* Opportunity to influence architecture and technical direction
* International product environment