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Backend Golang Developers in Poland

Developed Go search-service modules for a WebOps hosting platform using Solr, Elasticsearch, Kubernetes, Docker, and Google Cloud. Migrated European payment processing from a monolith to Kafka-backed microservices, reducing payment latency by more than 3.5 times across SEPA, SWIFT, and FPS flows.

• CMS hosting platform architecture
• PostgreSQL and MongoDB application backends
• React-integrated education product services
• Payment migration from PHP services

Designed financial-market data infrastructure processing approximately 50K Kafka messages per second and 100K Cassandra writes per second for trading, reporting, and tax systems. Owns a production estate spanning more than 30 repositories and roughly 130 Kubernetes deployments and scheduled jobs.

• Operated PostgreSQL analytical data stores
• Built Java and Go data services
• Managed crypto and traditional-finance pipelines
• Led a four-person data engineering team

Developed Go services for cybersecurity reporting, including asynchronous job processing, headless Chromium document rendering, signed object-storage delivery, and OAuth service authentication. Extended zero-downtime PostgreSQL logical-replication tooling across multi-schema clusters and improved graph-routing performance 2.5× for workloads serving more than one million riders.

• Kubernetes and Helm production packaging
• Patroni PostgreSQL high availability
• Prometheus and Grafana observability
• AI-agent engineering workflows

Built a Rust complex-event-processing engine that embeds Python processing blocks through PyO3 and executes asynchronous Kafka flows on Tokio. Its routing engine constructs deployment adjacency maps, coordinates multi-input block barriers, and uses NATS for transport between processing stages.

• Implemented custom Python data-type marshalling
• Managed the Python GIL across FFI
• Built Kafka sources and sinks with rdkafka
• Developed Linux filesystem drivers and firmware

Built an invoice web application with Spring Boot, Spring Security, Hibernate/JPA, and an Angular front end, covering authenticated business workflows and relational persistence. Developed a JavaFX Reversi application backed by PostgreSQL and JDBC, with REST integration and JSON, XML, and properties-based configuration.

• Containerized deployments with Docker and Kubernetes
• Redis-backed caching and data access
• Prometheus and Grafana monitoring configurations
• Cloud platform work across Azure and Google Cloud

Architected and deployed a scalable cloud infrastructure on AWS, optimizing resource allocation and cost management for large-scale applications. Developed secure identity and access management protocols using AWS IAM, ensuring compliance with industry standards. Engineered high-availability solutions with AWS EKS and EC2, enhancing system reliability and uptime.

• Implemented multi-region failover strategies with AWS VPC
• Optimized database performance using AWS RDS
• Designed automated infrastructure provisioning pipelines

Built backend services and REST APIs for e-commerce, fintech, cryptocurrency exchange, and iGaming products using Laravel and Go. Worked with Kafka-backed messaging, goroutine-based concurrency, and integrations spanning banking APIs, payment providers, Shopify, BigCommerce, and ERP systems.

• ClickHouse analytics storage
• MongoDB and Redis data layers
• Livewire dynamic interfaces
• Stripe and PayPal integrations

Developed cloud-native microservices architecture handling millions of requests per minute. Designed and optimized distributed caching systems for high-traffic e-commerce platforms. Led the migration of monolithic applications to scalable, containerized environments.

• Implemented RESTful APIs using Golang and TypeScript
• Integrated CI/CD pipelines for automated deployments
• Optimized database queries for performance gains

Built scalable backend services using Golang and Rust, focusing on high-performance data handling. Developed event-driven systems leveraging NATS for seamless microservices communication. Designed data models with MongoDB and PostgreSQL to support complex querying needs.

• Integrated Redis for session management in distributed systems
• Developed RESTful APIs with efficient Golang frameworks
• Utilized PostgreSQL for transactional data integrity

Architected high-performance distributed systems with Rust and Golang, focusing on low-latency applications. Led the design of load balancing solutions using Nginx and HAProxy to optimize network traffic. Implemented complex database schemas in MariaDB for e-commerce platforms.

• Optimized MySQL queries for better transaction throughput
• Designed API gateways for microservices architecture
• Developed caching strategies to reduce latency

Developed authorization infrastructure in Go and PostgreSQL, including an effective access-scope engine for RBAC across thousands of namespaces. Optimized a video-analysis pipeline for duplicate, copyright, and policy detection, reducing memory consumption by approximately tenfold through profiling and allocation tuning.

• SAC query latency reduced from 16 seconds to 1.6 seconds
• Go-native FIPS cryptography adoption
• Container hardening with ubi-micro images
• CI build time reduced from 35 to 12 minutes

Built event-driven Go services for real-estate ingestion and e-commerce inventory synchronization using PostgreSQL, MongoDB, Redis, RabbitMQ, and external APIs. Extracted functionality from monoliths into Dockerized services, including queue-based parsing, duplicate prevention, listing archival, and automated reactivation.

• WebSocket real-time communication
• Webhook-based third-party integrations
• S3-compatible object storage deployments
• Automated stock reconciliation

Architected distributed systems for large-scale data processing in cloud environments, leveraging Kubernetes for orchestration. Built a high-throughput messaging system with Golang, optimizing for low-latency communication across services.

• Automated deployment pipelines using Terraform and AWS Lambda
• Integrated Redis for efficient session management in web applications
• Optimized PostgreSQL queries to enhance database performance

Contributed backend engineering to mortgage workflows, legacy modernization, and a large-scale migration between banking systems. Served as an integration layer across platform services for a high-traffic gaming product and maintained legacy media software while introducing newer service components.

• PostgreSQL persistence work
• Rust and C systems code
• TypeScript service integration
• PHP application modernization