Voice Software Engineer

Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people with offices in Wrocław, Warsaw, and Cracow. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers.

If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊

We are looking for skilled Voice Software Engineers to strengthen our Voice Team working on carrier-grade voice solutions for our Residential Gateways. The role focuses on integrating and enhancing Asterisk-based voice systems.

We offer a choice of employment form: B2B or Employment Contract

• UoP: 17 000 – 20 000 PLN gross/month
• B2B: 130 – 150 PLN net/hour + VAT

Key Responsibilities:

• Development of carrier-grade voice features on top of an embedded Asterisk platform.
• Integration and optimization of FXS and DECT voice interfaces.
• Low-level development interfacing with SoC DSPs and DSPG chipsets.
• Tuning and optimization of voice performance, echo cancellation, QoS, and media streams.
• Debugging and optimizing SIP signaling, media handling, and call processing.
• Close collaboration with platform, QA, and product management teams to deliver high-quality voice solutions.
• Participate in voice feature design, validation, and field issue support.

You might be the perfect match if you are/have:

• 5+ years of work experience as a Voice Software Engineer or similar position.
• Strong proficiency in C programming for embedded systems.
• Strong experience with Asterisk or similar open-source PBX systems.
• In-depth knowledge of FXS, DECT, VoIP protocols (SIP, RTP, SRTP).
• Experience developing voice applications on embedded Linux.
• Knowledge of DSP programming or working closely with DSP-based architectures.
• Familiarity with voice quality optimization techniques and telephony standards.
• Solid understanding of SIP call flows, troubleshooting SIP/RTP traffic.
• Strong analytical and debugging skills in multi-threaded, real-time environments.
• Located in Poland.
• Communicative English.

Moreover, we appreciate skills in these areas:

• Experience with DSPG voice processors and tuning tools.
• Exposure to voice security features (e.g., SRTP, TLS for SIP).
• Familiarity with G.711, G.722, and other voice codecs.
• Experience with quality assurance processes for carrier certification.

By joining us, you gain the following:

• Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT;
• Possibility to develop in cloud technologies. We are a certified AWS partner;
• Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen;
• Respect for your private life so you don't have to work overtime or on weekends;
• Team Events budget to socialize outside of work;
• Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in Cape Town, Are, and Barcelona).

Perks and benefits:

• Fully remote work or in our office in Wrocław, Warsaw or Cracow;
• Free benefits such as Luxmed, Multisport, and life insurance in Nationale Nederlanden;
• Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior);
• Personal Training Budget with additional paid hours;
• Passion Day - an extra day off for your hobby to spend as you please;
• Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you;
• We provide high-quality work equipment + 2 additional monitors and accessories.

If you apply for this position and match our expectations, then:

1) You will be invited to an HR Screening with our IT Recruiter.

2) You will have a technical interview.

3) You will meet with a client.

Submit your application online in one easy step! Apply now!