Sławomir W.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I'm a quality focused software engineer with more than 10 years of experience in designing, developing and maintaining software systems and infrastructure around them using wide variety of technologies. Specialized in software architecture, DevOps and backend development, yet having experience in web development too. Quickly learning new things, adapting to new approaches and technologies. skills overview: -DevOps/SysOps experience and skills in designing infrastructure, system/database administration, continues delivery/integration, configuration management, orchestration, migrations, monitoring, logging etc. -experience in various cloud and container technologies like Amazon AWS, Google Cloud, OpenStack, Kubernetes, Dockar Swarm, ECS -designing software systems, leveraging knowledge of many software architectures and design approaches like micro-services, CQRS, event sourcing, DDD, layered, distributed etc. -experience in wide variety of datastores ranging from relational databases through many kinds of NoSQL databases to filesystem-like stores -very good knowledge of Linux OS(Debian, Ubuntu, CentOS, RHEL) -wide knowledge in network and security issues -programming in multiple paradigms(functional, object-oriented), writing tests(unit, integration, system, end-to-end, performance) -knowledge of various web technologies knowledge in technologies/languages: JVM, Scala, Java, Python, Bash, SQL, Ansible, SaltStack, Terraform, Docker, Kubernetes, AWS(EC2, EKS, ECS, S3, VPC, RDS, ELB, Autoscale, IAM), Jenkins, Gitlab CI, PIP, PyPI, Virtualenv, Setuptools, Sbt, Maven, Ant, Gradle Nginx, Apache, Tomcat, Let's Encrypt, PostgreSQL, MySQL, Oracle, MongoDB, Redis, RabbitMQ, Elasticsearch, Kibana, Logstash, Vault, Vagrant, Packer, Django, Akka(Core, Persistence, HTTP, Cluster), Play, Slick, JEE, Spring, HTML, Javascript, Android basic knowledge in technologies/languages: Google Cloud Platform, OpenStack, OpenShift, JBoss AS, Jetty, Traefik, HAProxy, Consul, Spark, Mesos, DC/OS, Kafka, Cassandra, Memcached, Prometheus, Icinga2, Grafana, Nagios, Chef, Puppet, Celery, Pants, KVM, Proxmox, OpenVPN, LDAP, Lift, jQuery, Selenium, Groovy, Rust, Go, C/C++, Ruby, Clojure, CSS I'm actively participating in Software Craftsmanship Kraków, DevOpsKRK and other IT communities occasionally contributing to open-source projects. Feel free to ask about availability, expertise or advice - I'm always interested in new challenges!