Telephony Engineer

How you’ll help us achieve it

At Wave, we manage a complex communications infrastructure to ensure our customers can reach us when in need, and similarly for Wave to convey important information to our customers. As a Telephony Engineer at Wave, you will be responsible for ensuring this infrastructure is highly reliable, scalable and cost-effective to support our rapid growth. You will design, implement, and maintain robust infrastructure and tools to handle millions of daily transactions in the form of voice calls, SMS and USSD sessions across multiple countries.

In this role, you'll;

• Design and implement physical networks that are secure, reliable and performant
• Owning the end-to-end integration and onboarding process for new telecommunication partners
• Optimizing performance and cost efficiency of backbone telephony services in a hybrid cloud/datacenter setup
• Automating telephony deployments and promoting infrastructure-as-code best practices
• Improving system observability through metrics, logging, tracing, and alerting
• Collaborating with product teams to proactively improve the reliability of our services
• Participating in and improving our on-call incident response processes
• Championing security and compliance in our infrastructure

Some challenges you’ll help us tackle:

• Scaling our communications infrastructure to handle 10x users
• Keeping costs stable and predictable as we scale up
• Ensuring 99.99% uptime for call processing systems despite unreliable local infrastructure
• Enabling millions of financial transactions with dependable delivery of OTP notifications
• Improving end-to-end testing of voice call flows
• Leading or being involved in the resolution of complex incidents and problems

Key details:

• You can work remotely from anywhere (between UTC -1 and +3) with reliable Internet access.
• Wave covers travel once per year to one of our operating countries in Africa, as well as a yearly stipend of $800 to meet with coworkers.
• We run performance reviews twice a year and award bonuses or promotions to strong performers who have been with the company for more than six months.
• Our salaries are competitive and are calculated using a transparent formula. For this role, we are offering a salary of up to $144,000 USD (paid in your local currency equivalent), plus a generous equity package.
• This role involves participating in an on-call rotation. When you’re on call you’ll carry a pager (just an app installed on your phone; we use PagerDuty for this), and in case an incident happens on your watch, you’ll be expected to be able to start troubleshooting within 15 minutes
• Major benefits: 
• Subsidized health insurance for you and your dependents and retirement contributions (both vary from country-to-country.
• 6 months fully paid parental leave and subsidized fertility assistance.
• Flexible vacation, with most folks taking between 30-40 days per year. 
• $10,000 annual charitable donation matching.

Requirements:

• 4+ years of experience in an SRE, DevOps, Network or Telecommunications Engineering role
• Solid understanding of networking and distributed systems. Can be trusted to design scalable and secure networks
• Demonstrable experience dealing with on-premises infrastructure
• Strong experience with cloud platforms (GCP preferred) and Terraform
• Track record of successfully implementing observability, reliability metrics, auto-provisioning and other SRE best practices
• Methodical troubleshoot skills; ability to diagnose complex networking issues spanning multiple distributed systems and network layers
• Proficiency in at least one backend language, preferably Python
• Excellent communication and collaboration skills
• Passion for our mission of bringing financial services to underserved markets

Bonus points for: 

• Knowledge of telephony-specific technologies: SIP, RTP, SMPP and USSD protocols. 
• Familiarity with our tech stack (Kamailio, Asterisk, Docker, Ansible, Python, Homer/Hepic, Datadog, Sentry, Redis, GraphQL)
• Past experience working with Twilio APIs
• Understanding of VoIP setups and optimization
• Good grasp of security best practices and compliance standards for financial services
• Contributions to open-source projects or infrastructure community

You might be a good fit if you:

• Care a lot about working on software whose mission you can believe in
• Have a bias for action. You see a problem, you fix a problem. You get buy-in for your solutions and keep tickets moving
• Have a growth mindset and a willingness to use your skills and experience to mentor less-experienced engineers
• Have the desire to learn from others and make yourself better every day
• Are excited to build world-class infrastructure that powers economic opportunity for an entire continent

About Engineering at Wave

We value:

• Boring technology
• Simple, predictable designs
• Deeply understanding our tools and systems
• Being tenacious in the face of tricky problems
• Constantly trying to improve, as engineers and colleagues

Our current tech stack:

• Backend: Python 3 (+ mypy) monolith
• Monitoring/observability: Honeycomb, Datadog, PGAnalyze
• Database: Postgres
• Orchestration: Kubernetes
• Infrastructure: GCP/DCs/Terraform
• Networking: Wireguard, Tailscale, Palo Alto, F5
• Telephony: Flex, Asterisk, Twilio
• Cache: Redis
• Data warehouse: Snowflake
• API layer: GraphQL
• Android frontend: Kotlin/Jetpack
• iOS frontend: Swift/SwiftUI
• Web frontend: TypeScript/React