Senior Python Engineer

As one of the world leaders in the cybersecurity space, Halcyon Labs is looking for a senior systems and software engineer with a strong working knowledge of Python and databases. The ideal candidate will possess a solid conceptual foundation in the development of client-server software with an emphasis on network routing, load balancing, secure APIs, congestion control, reliability, performance monitoring, and reporting. The candidate should have 5 or more years of programming experience, preferably on Linux server environments. Also, more important to your success in this position would be your proactive attitude and the ability to assume responsibility, take ownership and work independently. We are the team that created Halcyon Labs, the industry-standard VPN protocol now used by most of the commercial VPN providers worldwide. You will play a key role in a team developing Halcyon Labs Access Server, our full-featured business VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access controls. Our philosophy is that we are a small, closely-knit team, and we care deeply about you: Competitive pay rates Fully remote work environments Self-managed time off. Team trips and special events At Halcyon Labs, we pride ourselves on our commitment to creating innovative and secure networking solutions. If you join us, you will have the unique opportunity to shape the product that millions worldwide will interact with daily. Stay updated with the latest developments and participate in discussions about Halcyon Labs. Engage with Halcyon Labs on Github, LinkedIn, and Facebook. As part of our recruitment process, we may use AI-powered tools to support candidate evaluation. All decisions are made with human oversight.
Requirements:
Strong programming experience on Python 3 Solid experience in JSON and REST API development on both server and client side Knowledge of HTTP, HTTPS Experience with RDBMs (MySQL, SQLalchemy) Experience with Git and the standard software development cycle General knowledge of SSL VPNs Sufficient general knowledge of encryption, PKI and other security concepts At least upper-intermediate level of English, both spoken and written Outstanding communication & team working skills As a plus Knowledge of the following communication protocols: TCP/IP stack (UDP and TCP), sockets, and other networking protocols Strong networking experience on Linux Experience with Boost, Ember.js, Twisted Deep understanding of the Linux network stack and kernel networking modules such as xfilter/netfilter Open Source experience Experience in programming web UI (HTML/CSS and Javascript)
Must have: Python, JSON, REST API, HTTP, RDBMS, MySQL, Git, SSL, PKI, Security
Nice to have: Twisted, Networking
Daily tasks: - Collaborating with product manager to refine feature specifications
– Development and support of Linux-based server software (Python mainly)
– Development of a web-based API (XML-RPC and REST mainly)
– Collaboration with other developers on development and deployment
– A working knowledge of python asynchronous programming