Senior Java Developer

Job description

We are the team that created OpenVPN, the industry-standard VPN protocol now used by most commercial VPN providers worldwide. We are looking for a rock star to push the product further that millions of people worldwide will interact with daily! You should have a solid working knowledge of Java, Tomcat, and databases, excellent in understanding security topics, be familiar with TCP/IP networking and SSL VPN, possess a solid conceptual foundation in the development of self-hosted cross-platform redistributable solutions, and have network programming understanding on Linux development environment.

You will join a team responsible for the requirement specifications, system specifications, software development, and maintenance of several critical security-related redistributable systems.


  • Full-cycle development of cross-platform redistributable software with a primary focus on Linux, including development from scratch and maintaining existing services;

  • Extending web-based API (using JSON and REST) for management of product systems;

  • Collaboration with other developers on development and deployment.


  • 4+ years of commercial programming experience;
  • 4+ years of experience with Java;

  • Recent experience in developing redistributable cross-platform systems on Java;

  • Experience with Spring Framework and dealing with REST API;

  • Diverse experience with Apache Tomcat, including configuring, tweaking, and troubleshooting complex setups;

  • Experience with embeddable RDBMS, SQLite is preferable;

  • Experience with embeddable messaging in Java (like ZeroMQ);

  • Good hands-on in Bash;

  • Good understanding of networking;

  • At least upper-intermediate English, both spoken and written;

  • Excellent communication abilities.

Nice to have:

  • Experience with distributed redistributable systems and clustering;
  • Experience with time series databases and/or OLAP databases (like ClickHouse);
  • Security topics hands-on with Spring Security (SAML, OAuth2);
  • Experience in the security space, specifically PKI, encryption, x.509 certificates, SSL;
  • Experience with performance testing (Apache Benchmark, JMeter, Gatling);
  • Experience in hardening redistributable systems (reproducible builds, obfuscation, etc.);
  • Experience in developing both console applications and modern REST services on Spring Boot
  • Experience in designing update processes for remote redistributable system

Our philosophy is that we are a small, closely-knit team, and we care deeply about you:

  • Competitive salary;

  • Paid vacation 18 working days off per year + national public holidays;

  • Unlimited paid sick leaves;

  • Great modern office space in the city center (Lviv and Kyiv);

  • Flexible working schedule, full remote work possible;

  • Working directly with colleagues from Silicon Valley and around the world;

  • Team trips, certification and events compensation, medical insurance, sports, etc.

Candidate journey:

🤔 Recruiting screening -> Tech interview (I) -> Tech Interview (II) -> Interview with Operations Manager -> Offer 🤗