Senior Staff Engineer – Voice Signaling & Cloud Services at Skylo Technologies

Espoo, Uusimaa, Finland

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Not SpecifiedCompensation

Senior (5 to 8 years), Expert & Leadership (9+ years)Experience Level

Full TimeJob Type

UnknownVisa

Telecommunications, Satellite Communications, IoTIndustries

Requirements

8+ years of experience in software development using OOP and microservices
Bachelor's or Master's degree in Computer Science, Engineering, or related field
Expertise in CSFB, I1, SIP signalling, and 3GPP IMS standards for telephony services
Skilled in building SIP-based solutions using SIP stacks for proxy clients and B2B servers
Hands-on experience with VoIMS and SIP/IMS network implementation
Proficient in tools like SIPP and FreeSWITCH for test environments
Programming expertise in C/C++, Go, or Java with strong SQL schema and query skills
Knowledge of stream processing (GCP Pub/Sub, Kafka) and REST API design
Experience with scalable distributed systems and horizontal scaling
Familiar with Kubernetes, Docker, Jenkins pipelines, and GCP tools
Strong understanding of code quality, performance metrics, and CI/CD tools (e.g., JMeter, Postman, Grafana, Prometheus)
Collaborative team player with excellent communication skills

Responsibilities

Lead the design and development of Voice Services over NB-IoT
Build and optimize Voice Gateway signalling components and media session setup
Implement CSFB-SS7 (I1 protocol) for integration with NTN carriers and 3GPP IMS Core
Develop scalable Voice Gateway Server with CSFB-I1 and SIP/SDP interworking functions
Integrate third-party SIP/SDP protocol stacks for seamless operation
Focus on optimizing voice services for low-bandwidth networks
Support thousands of SIP sessions with interworking to MNO SBC and IMS networks
Define and execute test cases, automation, and code coverage with QA teams
Oversee build and deployment processes using Jira, Jenkins, GCR/GKE
Ensure security best practices in development and deployment
Collaborate with platform engineering and cross-functional teams for streamlined development
Establish disciplined processes for timely, high-quality software delivery with robust testing

Skills

Key technologies and capabilities for this role

Voice ServicesNB-IoTVoice GatewayCSFB-SS7I1 protocol3GPP IMS CoreSIPSDPSIP/SDP interworking3GPP standardscloud-nativevRANsignallingmedia session setup

Questions & Answers

Common questions about this position

What is the work location and office requirement for this role?

The role is located in Espoo, Finland, with an onsite requirement of 3 days a week in the office. It may also involve the team in Bangalore.

What salary or compensation is offered for this position?

This information is not specified in the job description.

What are the key skills and experience required for this role?

Candidates need 8+ years in software development using OOP and microservices, expertise in CSFB, I1, SIP signalling, and 3GPP IMS standards, experience with SIP-based solutions and VoIMS, and proficiency in C/C++, Go, or Java. A Bachelor's or Master's in Computer Science or related field is required.

What is the team structure or collaboration like at Skylo?

The role involves collaborating with platform engineering and cross-functional teams for streamlined development, as part of the software development team in Espoo and Bangalore.

What makes a strong candidate for this Senior Staff Engineer position?

A strong candidate combines 8+ years of experience in OOP/microservices with deep expertise in CSFB, I1, SIP/3GPP IMS, VoIMS, and programming in C/C++, Go, or Java, plus a passion for architecting best-in-class Voice Gateway solutions.

Skylo Technologies

Satellite-based connectivity for remote communication

About Skylo Technologies

Skylo Technologies provides satellite-based connectivity solutions that enhance communication for existing devices in remote locations. By partnering with established satellite providers, Skylo extends coverage without the need to build its own satellites, allowing for a more cost-effective service. This is particularly beneficial for industries like energy, logistics, and healthcare, where operations often occur in isolated areas. Skylo's services include two-way GPS and messaging, which are crucial for monitoring the electrical grid, ensuring the safety of remote workers, and facilitating critical deliveries such as vaccines. The company charges customers based on coverage needs, number of connected devices, and data usage, aiming to provide affordable communication solutions for businesses and individuals.

Mountain View, CaliforniaHeadquarters

2017Year Founded

$148.8MTotal Funding

LATE_VCCompany Stage

Energy, Social Impact, HealthcareIndustries

51-200Employees

Benefits

Health Insurance

Dental Insurance

Vision Insurance

401(k) Retirement Plan

Stock Options

Wellness Program

Professional Development Budget

Paid Vacation

Paid Holidays

Flexible Work Hours

Risks

Increased competition from companies like HMD Global may impact Skylo's market share.

Integration challenges with partners like Cubic Telecom could affect service quality.

Limited extension of partnerships, like with Google, may restrict market reach.

Differentiation

Skylo leverages existing satellite infrastructure, reducing costs and speeding up service deployment.

The company offers seamless roaming between terrestrial and satellite networks, enhancing connectivity.

Skylo's focus on remote communication supports industries like energy, logistics, and healthcare.

Upsides

Growing interest in satellite IoT solutions boosts Skylo's market potential.

Partnerships with major companies like Google expand Skylo's consumer device integration.

Skylo's strategic regulatory focus aids in navigating complex global markets.

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