Kanstantsin Kamkou (kkamkou) :: contractor/freelancer

Real-Time Stream Processing: Design and implement resilient Kafka/Streams/Flink pipelines for GBps workloads — from payment frameworks (HSBC) to vehicle telemetry via OBD and VW Group platforms (Audi, Porsche, etc.).

Automotive Payment Integration: Built and deployed full-cycle integration with T500 fuel stations — from low-level socket protocols to a white-label API used by Mercedes-Benz and bp — enabling real-time mobile and in-car payments across Europe.

Reactive Systems at Scale: Deliver fault-tolerant event-driven architectures powered by Kafka — built for low-latency, high-throughput workflows in production.

Polyglot Backend Development: End-to-end backend engineering in Java (8–21), Python, and Node.js/TypeScript — paired with robust SQL/NoSQL design.

Legacy Modernization & Digitalization: Transform legacy platforms into cloud-native microservices and digital workflows — backed by years of refactoring experience, without breaking production or holding up development (Deutsche Bank and Philips).

Reliable Delivery: Clients trust me as a consistent, no-drama developer — focused, steady, and known for delivering secure, production-ready code that just works.

Zero handwaving
I ship working code — not architecture PPTs or hello-world concepts.

You’re building payment systems or drowning in vehicle telemetry (OBD, sensor streams) — and need scalable, fault-tolerant ingestion pipelines with durable storage.
Your Kafka/Flink setup can’t handle the load — large payloads, backpressure, cold storage, flaky behavior.
You’re deep in multithreaded, concurrency-heavy systems — and need someone who writes scalable, crash-proof code.
Your codebase requires major structural changes — from framework migrations to massive refactorings across multiple projects.
You’re bridging embedded and cloud (AWS S3 or Azure ADLS, Kubernetes) and need someone who’s delivered production systems at OEM scale.
You need real-time apps or dashboards (diagnostics, reports, payments) that work seamlessly with event-driven backends.
Your team is stuck in planning hell — endless confluence docs, over-explaining basics, and turning trivial work into untrackable ticket chains.
You just need a reliable developer who can join next week and start contributing — no babysitting, no warm-up cycle.

Re-architected and stabilized the main Apache Flink pipeline (GDC) in the Unified Data Ecosystem (UDE STR) to handle multi-GBps vehicle telemetry traffic.
Delivered full-cycle implementation of cold storage, large message handling, and package merging features in the GDC pipeline, enabling seamless migration of key features to other pipelines.
Implemented end-to-end large message streaming ingestion (up to 64 MB) at the API level.
Boosted DevOps flexibility by decoupling Flink configurations, adding DFS support, and defining production upgrade procedures for Flink.

Contributed to the «TradeFinder» financial portal by migrating data pipelines, scripts (python, matlab, sh), and web interfaces to newer versions, addressing security issues and supporting ongoing maintenance and improvements.

As a core team member, responsible for the design, implementation, and maintenance of microservices within HSBC’s Payments Orchestration Layer framework, a key part of their high-value, high-volume payments system.
The architecture used gRPC, Kafka, Kafka Streams, and Oracle in a resilient, lowlatency mesh optimized for high throughput in a secure, regulated environment.
Also provided Level 3 (L3) support.

Led an integration segment of the «Working Capital» financial project, focusing on aligning the existing ING flow with Amazon loan programs. Performed initial business analysis, and actively participated in coding, contributing significantly to the improvement and maintenance of related microservices.

Major migrations and enhancements of both backend and frontend legacy code for the medical application «TOMTEC-ARENA».

The architecture and implementation of ryd.pay, currently in use by Mercedes-Benz and BP, including white-label APIs, payment processing, low-level concurrent socket communication with fuel pumps, and traceability features.
Developed the initial fleet management web application and a fuel station simulation web tool for business presentations and integration.
The complete real-time infrastructure for GPS map matching and over-speeding utilizes Apache Flink, Flume, and Kafka.
The complete Business Intelligence (BI) infrastructure and its interconnections.

Took over the existing backend/frontend implementation from an outsourcing team
Led a successful backend refactoring phase for a three-year-old system
Reorganized deployment and code-quality processes
Introduced a Single Sign-On (SSO) web-framework, reducing integration time from a quarter to days
Interconnections between Business Intelligence (BI) and the Single Sign-On (SSO) framework.

Architecture and implementation of a crawler. Dumping Apple’s app store and Android’s app store within a day including media.
Senior developer at «preisvergleich» team. Valuable aggregations of a SQL databases.

Enhancement of an ERP solution for York Oil & Gas Management, Inc.
Development and support software called «phpRack». The software is used to test the server’s capabilities before integrating a solution.

Did present own CMS «S-Motion» at TIBO-2005 (the largest exhibition in Belarus in the field of telecommunications, bank and office technologies).
Linux shell scripting for detecting obsolete software on IBM servers.
Development of various web-services and web-sites for large manufacturers and the national bank.