VoIP and GSM Systems Engineer

Madfish; Remote; GBP 50,000 - 70,000; Full time

Job summary

A wellness brand is seeking a VoIP & GSM Systems Engineer to develop a robust communication system focusing on secure SMS and voice verification. The ideal candidate will have experience with GSM gateways, IP telephony, and PBX configuration. This role encompasses designing virtual systems, optimizing telecom operations, and connecting with U.S. telecom operators to enhance functionality and reliability in communication. Join us to grow secure connections and ensure seamless operations.

Benefits

Welcome pack and custom True Sea Moss merch

Sports reimbursement

Additional vacation days

Coaching & career development sessions

Corporate English lessons

WHOOP membership

Coworking membership

Sabbatical options

Travel and project grants

Qualifications

• Hands-on experience with GSM gateways like GoIP or Dinstar.
• Understanding of SIP trunking and PBX configuration.
• Experience integrating PBX with web applications.

Responsibilities

• Design and deploy a virtual PBX system.
• Build and configure IP-PBX environments.
• Integrate GSM gateways via SIP/IAX2 protocols.
• Optimize signal quality and ensure stable reception.

Skills

GSM gateway experience

IP telephony knowledge

PBX configuration

Strong troubleshooting skills

Tools

Asterisk

FreePBX

3CX

Job description

Come build something true with us. We’re True Sea Moss, a fast-growing wellness brand built on the healing powers of one of nature’s oldest superfoods: sea moss. No powdered promises. No pretty lies. Just clean, potent nourishment pulled from the wild and delivered to the people who need it most. Learn more about our products: https://trueseamoss.com/

As we grow, we’re expanding our technical infrastructure and are looking for a VoIP & GSM Systems Engineer — a specialist who can help us build a reliable communication system for secure SMS and voice verification in the U.S. This role is ideal for someone who loves working at the intersection of telecom, hardware, and software — someone who understands how to make systems talk, connect, and run seamlessly.

What You’ll Be Doing

• Design and deploy a virtual PBX system using physical SIM cards.
• Build and configure IP-PBX environments (Asterisk, FreePBX, 3CX, or FreeSWITCH).
• Integrate GSM gateways via SIP/IAX2 protocols.
• Connect and manage SIM cards from U.S. operators (Verizon, AT&T, T-Mobile, US Cellular).
• Configure call and SMS routing for OTP, bank verification, and two-factor authentication.
• Test and ensure stable reception of bank SMS and calls.
• Optimize signal quality (antennas, frequency bands, gateway positioning).
• Document configurations and integration steps clearly and concisely.

What You Bring

• Proven hands‑on experience with GSM gateways (e.g., GoIP, Dinstar, Hybertone, DBLtek, etc.).
• Solid understanding of IP telephony, PBX configuration, and SIP trunking.
• Experience integrating PBX with web applications or internal systems.
• Familiarity with telecom standards and U.S. frequency bands (GSM 850/900/1800/1900 MHz, LTE Bands B2, B4, B12).
• Knowledge of relevant codecs (G.711, G.722, G.729A, GSM).
• Strong troubleshooting, documentation, and communication skills.

Nice‑to‑Haves

• Experience optimizing hardware setups (antennas, amplifiers, modems).
• Familiarity with telecom security and anti‑fraud measures.
• Understanding of carrier‑specific routing and SMS delivery in the U.S.
• Basic scripting or automation skills for system monitoring.

Why Work With Us

We’re building something with depth and direction. No shortcuts. No hype cycles. You’ll be part of a team that actually listens, tests, learns, and evolves — and you’ll have a major say in how our systems scale securely and reliably.

Here’s How We Back Our Words with Care

• Welcome pack and custom True Sea Moss merch to start strong
• Sports reimbursement to support your mental and physical well‑being
• Additional vacation days beyond standard holidays
• Coaching & career development sessions to fuel your growth
• Corporate English lessons to sharpen communication
• WHOOP membership to support your health and recovery
• Coworking membership for flexibility and focus
• Sabbatical options after long‑term contributions
• Travel and project grants to support personal growth and creativity

So — if you’re ready to engineer reliable connections and help True Sea Moss grow its secure communication ecosystem, we’d love to meet you.