Tomasz Sokołowski Email and Phone Number

I’m a freelance Senior Data / Software Engineer with 15+ years of professional experience helping companies architect and build scalable data lakes and data warehouses. I’ve been providing services for many high-profile clients on a long-term and short-term contractual basis, including: VF Corporation, Sony, Novartis, Boehringer Ingelheim, Regeneron Pharmaceuticals, Nordea Bank, Aegon Asset Management, Alef Education.Key skills & tech stacks:[+] Python, Scala, SQL, Procedural SQL… Show more I’m a freelance Senior Data / Software Engineer with 15+ years of professional experience helping companies architect and build scalable data lakes and data warehouses. I’ve been providing services for many high-profile clients on a long-term and short-term contractual basis, including: VF Corporation, Sony, Novartis, Boehringer Ingelheim, Regeneron Pharmaceuticals, Nordea Bank, Aegon Asset Management, Alef Education.Key skills & tech stacks:[+] Python, Scala, SQL, Procedural SQL (PL/SQL)[+] Spark (including Spark Streaming), Hadoop, pandas, Akka Streams, Flink[+] Databricks, Cloudera[+] AWS: S3, Glue, EMR, Redshift, Athena, Kinesis, RDS, Step Functions, Lambda, SQS, EventBridge, API Gateway, CloudWatch, IAM, Cognito, EC2, Fargate)[+] Enterprise data warehousing (Redshift, Snowflake, Denodo)[+] Enterprise data lakes (S3, HDFS, Delta Lake)[+] Terraform, Cloud Development Kit (CDK) Show less

We are specializing in custom-built IoT devices integrated with custom-built, high quality and Machine Learning-powered analytical systems. Our embedded air quality measurement devices called yetiBox (http://www.yetibox.eu) are currently installed in 66% of polish shipyards (and we are going to cover 100% of polish shipyards soon). All of them are integrated with yetiSense (https://yetisense.com) analytics platform which offers visualisations overlayed on high quality maps (orthophoto… Show more We are specializing in custom-built IoT devices integrated with custom-built, high quality and Machine Learning-powered analytical systems. Our embedded air quality measurement devices called yetiBox (http://www.yetibox.eu) are currently installed in 66% of polish shipyards (and we are going to cover 100% of polish shipyards soon). All of them are integrated with yetiSense (https://yetisense.com) analytics platform which offers visualisations overlayed on high quality maps (orthophoto maps coming soon) and interactive dashboards. Our platform provides reliable alarming and detailed reporting system. We provide our customers with risk assessment (currently targeted mainly at transport and logistics industry) and anomaly detection algorithms.Media about us:[+] https://www.trojmiasto.pl/wiadomosci/Port-Gdynia-bedzie-badal-powietrze-n127426.html[+] https://www.port.gdynia.pl/pl/wydarzenia/aktualnosci/1214-system-yetisense-monitoruje-jakosc-powietrza-w-porcie-gdynia[+] http://www.gospodarkamorska.pl/Porty,Transport/system-yetisense-monitoruje-jakosc-powietrza-w-porcie-gdynia--.html[+] https://www.gdynia.pl/co-nowego,2774/nowy-system-czujnikow-jakosci-powietrza-w-porcie-gdynia,528296[+] https://www.portalmorski.pl/porty-logistyka/40498-w-porcie-gdynia-dziala-juz-nowy-system-do-monitoringu-jakosci-powietrza[+] https://www.rynekinfrastruktury.pl/wiadomosci/porty/port-gdynia-monitoruje-jakosc-powietrza--64333.html[+] https://oficynamorska.pl/2018/ekologicznie-w-porcie-gdynia-dziala-juz-nowy-system-yetisense-do-monitoringu-jakosci-powietrza[+] http://glosgdyni.pl/pl/12_biznes/2056_w_porcie_gdynia_nowy_system_yetisense_do_monitoringu_jako_ci_powietrza.htmlWe rely heavily on AWS and ELK stack. We do a lot of Python, we do embedded C, we do Scala and Java, Node.js and React (React Native included), Ansible, Gitlab and more. We are a team of experienced developers and sysadmins (we've been @ Intel, Sony, Noon, ADVA).Our work is our passion. Show less

Agile (Scrum) core framework development of distributed Network Management System (NMS) following Software-Defined Networking (SDN) approach.Powered by:[+] Python, Tornado, Greenlets, pyDoubles, PyHamcrest, PyMonad, Fabric, make[+] Python code deployments and optimizations in embedded systems, foreign functions/data types via ctypes[+] Scala, Akka, Karaf, Spray[+] MongoDB, ZooKeeper, Logstash, Redis, RabbitMQ, WebSockets[+] VirtualBox, Docker[+] YANG modeling… Show more Agile (Scrum) core framework development of distributed Network Management System (NMS) following Software-Defined Networking (SDN) approach.Powered by:[+] Python, Tornado, Greenlets, pyDoubles, PyHamcrest, PyMonad, Fabric, make[+] Python code deployments and optimizations in embedded systems, foreign functions/data types via ctypes[+] Scala, Akka, Karaf, Spray[+] MongoDB, ZooKeeper, Logstash, Redis, RabbitMQ, WebSockets[+] VirtualBox, Docker[+] YANG modeling language, pyang plugins development[+] GIT[+] SOA, Model-Driven Development, TDD[+] Team Forge, Jenkins CI, Phabricator[+] AWS, Rackspace Show less

Company & location: ADVA Optical Networking, Gdynia, PolandPosition: R&D EngineerPeriod: April 2013 - December 2013Agile (Kanban) full-stack solo development of highly scalable Document Management System (DMS) for Technical Documentation Department.Powered by:[+] Python, Django, Tornado, Celery, Fabric, uWSGI, Supervisord[+] PostgreSQL, MongoDB + GridFS distributed storage, Elasticsearch, Redis, Nginx, Varnish, Zabbix, Sentry[+] HTML5, CSS… Show more Company & location: ADVA Optical Networking, Gdynia, PolandPosition: R&D EngineerPeriod: April 2013 - December 2013Agile (Kanban) full-stack solo development of highly scalable Document Management System (DMS) for Technical Documentation Department.Powered by:[+] Python, Django, Tornado, Celery, Fabric, uWSGI, Supervisord[+] PostgreSQL, MongoDB + GridFS distributed storage, Elasticsearch, Redis, Nginx, Varnish, Zabbix, Sentry[+] HTML5, CSS, JavaScript/CoffeeScript, JQuery, Underscore.js, Twitter Bootstrap[+] SVN, GIT[+] SOA, TDD[+] TeamForge, Jenkins CI[+] Rackspace Show less

Agile (Scrum) development of Python + Django backend at Dynado.com.Powered by:[+] Python, Django, Gunicorn, Greenlets, Celery, Fabric, comet programming (long-polling)[+] PostgreSQL, Memcached, Elasticsearch, ZeroMQ, Redis, Nginx, Zabbix[+] HTML, CSS, JavaScript/CoffeeScript, JQuery, Backbone.js, Underscore.js[+] Mercurial[+] Jenkins CI

Agile (Scrum) development of www.mila.com internal and public REST API.Powered by:[+] Python, Django, Celery, uWSGI[+] MongoDB + GridFS distributed storage, Solr, Splunk, Nginx, New Relic[+] GIT[+] SOA, TDD[+] Bamboo, Fisheye, Crucible

Lead development of various web-based applications. Many web apps, mostly corporate intranets, CRMs, websites, mailing systems for banks and insurance companies (BZ WBK, Kredyt Bank, HDI Asekuracja), powered by:[+] PHP 5, Zend Framework[+] HTML, CSS, JavaScript, JQuery[+] PostgreSQL, MySQL, Apache, Nagios[+] SVNMatch scoreboard application for PGE Arena stadium powered by:[+] C# WPF[+] SVNFull-stack development of chat platform for Kredyt Bank… Show more Lead development of various web-based applications. Many web apps, mostly corporate intranets, CRMs, websites, mailing systems for banks and insurance companies (BZ WBK, Kredyt Bank, HDI Asekuracja), powered by:[+] PHP 5, Zend Framework[+] HTML, CSS, JavaScript, JQuery[+] PostgreSQL, MySQL, Apache, Nagios[+] SVNMatch scoreboard application for PGE Arena stadium powered by:[+] C# WPF[+] SVNFull-stack development of chat platform for Kredyt Bank powered by:[+] Node.js, Express.js, Socket.io[+] HTML, CSS, JavaScript/CoffeeScript[+] MongoDB, Varnish with ESI, Zabbix[+] SVNCore development of high performance, scalable and highly available CMS platform for Onet.pl powered by:[+] Python, Django, Celery, Fabric[+] HTML, CSS, JavaScript/CoffeeScript, JQuery[+] PostgreSQL, MongoDB + GridFS distributed storage, SQLite, Memcached, RabbitMQ[+] Nginx, Varnish, CDN running on the top of MongoDB + GridFS, Zabbix, Sentry[+] GIT[+] Jenkins CIVarious sites built on top of CMS platform:[+] http://poznajpolske.onet.pl/[+] http://programtv.onet.pl/[+] http://magia.onet.pl/[+] http://gotowanie.onet.pl/[+] http://pogoda.onet.pl/ Show less

Agile (Scrum) development of Polskapresse Grupa owned sites - including most of *.gratka.pl sites, http://www.polskatimes.pl/, http://www.wiadomosci24.pl/, http://alegratka.pl/, http://www.motofakty.pl/ and many many others, powered by:[+] PHP 5, modded Smarty, XML / XSLT, XML-RPC[+] HTML, CSS, JavaScript, custom built JavaScript core framework[+] MySQL, Memcached, Apache, Haproxy, Nagios, Cacti[+] SVNLegacy code maintenance powered by:[+] PHP 4, Perl… Show more Agile (Scrum) development of Polskapresse Grupa owned sites - including most of *.gratka.pl sites, http://www.polskatimes.pl/, http://www.wiadomosci24.pl/, http://alegratka.pl/, http://www.motofakty.pl/ and many many others, powered by:[+] PHP 5, modded Smarty, XML / XSLT, XML-RPC[+] HTML, CSS, JavaScript, custom built JavaScript core framework[+] MySQL, Memcached, Apache, Haproxy, Nagios, Cacti[+] SVNLegacy code maintenance powered by:[+] PHP 4, Perl, CShift-based (every second sprint) production bug fixing/monitoring/performance tuning and technical customer support of aforementioned sites powered by:[+] Nagios, Cacti[+] a lot of non-web server PHP (with pseudo-threading via PCNTL), BASH scripting, PCREMany contributions to company's PHP and JavaScript core frameworks. Show less

Core framework and feature development of large SAGA2 CRM system powered by:[+] PHP 5, XML / XSLT[+] HTML, CSS, JavaScript, JQuery[+] MySQL, Apache[+] SVNMaintenance and techical customer support of http://acadomia.es/ CMS powered by:[+] PHP 5, Smarty[+] HTML, CSS, JavaScript, JQuery[+] MySQL, Apache[+] SVN

Core framework and feature development of http://www.snajper.gda.pl (dead by now) website powered by:[+] PHP 5, XML / XSLT, Propel ORM / Doctrine ORM[+] HTML, CSS, JavaScript, Prototype.js[+] MySQL, Apache[+] CVS, SVNComplex administration of development server powered by:[+] bare-metal running Gentoo

Frontend/backend development of various websites powered by:[+] PHP 5, Smarty[+] HTML, CSS, JavaScript[+] MySQL, Apache[+] SVNMaintenance and feature development of http://www.cyfrowe.pl/ powered by:[+] PHP 5, Smarty[+] HTML, CSS, JavaScript[+] MySQL, Apache[+] SVNMicrosoft Excel macros development powered by:[+] Visual BasicComplex administration of development server powered by:[+] bare-metal running Slackware

Complex administration - including network design and construction, monitoring, intrusion detection and prevention, bandwidth allocation, malfunction detection and removal - of neighborhood WAN powered by:[+] gateways/routers/servers running Slackware/Red Hat[+] iptables, portsentry[+] CBQ queueing, IPv6 via XS26 tunnel broker[+] heavy BASH and TCL (mostly for IRC bots) scripting, C socket programming