# Simon Balikov Simon Balikov is a remote worker on Himalayas, Senior Software Engineer at NDA Retail Group, based in Serbia. Source: https://himalayas.app/@simonbalikov ```text Senior Software Engineer at NDA Retail Group who cut demand-calculation time from 30 minutes to 11 with Apache Ignite and parallel Compute Tasks. ``` | Detail | Value | | --- | --- | | Availability | Looking for a job | | Location | Serbia | | Authorized to work in | Serbia | | Salary expectations | 82k+ USD | | Job categories | Software Engineer, Java Developer, Java Backend Engineer | | Skills | Java, Java 17, Kotlin, Spring Boot, Spring Framework, Microservices, Distributed Systems, Event Driven Architecture, Transactional Patterns, Concurrency, Performance Optimization, Apache Ignite, Parallel Computing, Kafka, RabbitMQ | | LinkedIn | https://linkedin.com/in/semyon-balikov | | GitHub | https://github.com/toSambk | ## About ```text At NDA Retail Group, I architected and delivered a centralized Calculation Management System for demand-calculation workflows. I also built an asynchronous task-aggregation and batch-write framework that reduced preprocessing for one distribution center across 230 suppliers from five minutes to 230 milliseconds. I introduced Apache Ignite caching and parallel Compute Tasks, reducing that center’s calculation time from 30 minutes to 11. I also implemented transactional outbox and inbox patterns with idempotent processing for effectively exactly-once interaction with the Calculation Platform. At DXC Technology, I developed and supported checkout, basket, and delivery-slot reservation features for Ahold Delhaize. I increased stable email-processing throughput from 15 TPS to 50 TPS and contributed to failed-order orchestration that increased retry speed and throughput by 30%. Earlier, I delivered financial-data microservices at Citigroup and a document-exchange microservice at VTB. I began my career in automation and control, programming PLC systems and integrating building-control protocols. ``` ## Experience ### Senior Software Engineer (current) NDA Retail Group. Jun 2025 - Present ```text Architected a centralized Calculation Management System and built an asynchronous task-aggregation framework, reducing preprocessing time from 5 minutes to 230 milliseconds. Implemented transactional outbox/inbox patterns and Apache Ignite caching to cut calculation time from 30 to 11 minutes. ``` Skills: Java, Spring-Boot, Microservices, Apache-Ignite, Distributed-Systems, Asynchronous-Processing, Transactional-Outboxes, Inbox-Pattern, Performance-Optimization ### Senior Software Engineer Ahold Delhaize. Dec 2023 - Jun 2025 ```text Developed checkout, basket, and delivery-slot reservation features for a large-scale retail platform. Increased email-processing throughput from 15 TPS to 50 TPS by migrating to Kafka and redesigning the service. ``` Skills: Java, Spring-Boot, Microservices, Kafka, REST-APIs, Performance-Optimization, Release-Management ### Lead Software Engineer [Citigroup](https://himalayas.app/companies/citi). Feb 2022 - Dec 2023 ```text Designed service architecture for enriching portfolio data in a treasury and trading platform. Delivered microservices for converting, enriching, and tagging financial data within processing-time limits. ``` Skills: Java, Spring-Boot, Microservices, Financial-Data-Processing, Architecture-Design ### Senior Software Engineer IPF Digital. Jun 2021 - Feb 2022 ```text Refactored concurrent scoring and pricing workflows to prevent out-of-memory failures and improve processing performance. ``` Skills: Java, Concurrency, Performance-Optimization, Refactoring ### Java Software Engineer VTB. Jan 2020 - Jun 2021 ```text Designed and delivered a microservice for document exchange with a major enterprise client. Led the engineering team in completing high-priority tasks before the annual release freeze. ``` Skills: Java, Microservices, Team-Leadership, Document-exchange ### Intern Andersen Lab. Dec 2019 - Jan 2020 ```text Built hands-on experience with Java and backend development through internal fintech projects. Demonstrated readiness for production work and progressed to a client-facing Java Software Engineer role. ``` Skills: Java, Backend-Development ### Programmer of Automation & Control EC NOVATON. Feb 2017 - Dec 2019 ```text Programmed PLC systems using Siemens Desigo, Carel, Segnetics, and Beckhoff platforms. Integrated Modbus, Profibus, and KNX protocols for heating, ventilation, air-conditioning, and smart-building systems. ``` Skills: PLC-Programming, Siemens-DesigoCC, Carel, Segnetics, Beckhoff, Modbus, Profibus, KNX ## Education ### Saint Petersburg State Electrotechnical University LETI Master's Degree, Mechatronics and Robotics. 2016 - 2018 ```text Master's degree in Mechatronics and Robotics from Saint Petersburg State Electrotechnical University LETI, completed in 2018. ``` ### Saint Petersburg State Electrotechnical University LETI Bachelor's Degree, Control in Technical Systems. 2012 - 2016 ```text Bachelor's degree in Control in Technical Systems from Saint Petersburg State Electrotechnical University LETI, completed in 2016. ``` ## Tech stack - Microsoft Azure - Kubernetes - Liquibase - MySQL - MongoDB - Spring Boot - Spring Framework - Vue.js - Java - Kotlin - Kafka - RabbitMQ - Hibernate - Linux - GraphQL - gRPC - JUnit - Mockito - Git - Docker - SQL - Azure Cosmos DB - Apache Ignite - Hazelcast To contact Simon, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire). ## People also viewed - [Vladimir Ćirković](https://himalayas.app/@vladimircirkovic): Senior Software Engineer, BVNK - [Aleksey Yuganov](https://himalayas.app/@alekseyyuganov): Java Developer, IT ONE - [Marko Domić](https://himalayas.app/@marko-domic): Senior Software Engineer, Fivetran - [Vlajko Maric](https://himalayas.app/@vlajkomaric): Senior Back end Developer, Birdseye Security - [Konstantin Stepanyuk](https://himalayas.app/@konstantinstepanyuk): Senior Golang Developer, Remote - [Aleksandr User](https://himalayas.app/@aleksandruser3): Senior Java Software Engineer, IBM - [Александр Фефилов](https://himalayas.app/@0006751): Kotlin backend developer, Alfa Bank - [Dejan Dimitrijević](https://himalayas.app/@dexdimitrijevic): Staff / Team Lead Software Engineer, Coredump / Hylastix - [Slobodan Vasic](https://himalayas.app/@slobodanvasic): Software Development Senior/Tech Lead, Engineering Software Lab d.o.o - [Sergey Chernolyas](https://himalayas.app/@sergeychernolyas): Java Developer, Digital Future Group