We are always
hiring talent

Why work at CALLR

We are normal people who like breakfasts, yoga, beers, coding, FIFA, traveling, good food, but also McDonald’s, coding again and other stuff. Come join us and add your special little talent to the list. We value the well being of our talents and try to show our love everyday Health benefits Meal vouchers Christmas vouchers 50% Club Med Gym voucher Challenges and prizes (1 week in NY offices, Sports tickets…) Win an iPhone if we hire on your recommendation

Don't be shy and apply now!

Team Engineering

Junior Web Developer

Paris

To support our rapid growth, CALLR is looking for 2 junior web developers to join our engineering team and contribute to all our internal interfaces.

Responsibilities

  • Technical design & development of our customer support interface
  • Help us improve our existing monitoring & troubleshooting tools
  • Stay technologically sharp and offer new ideas & methods to ensure we remain on the cutting edge
  • Write and document, quality optimized code

Required skills

  • Passionate about PHP, you also have a healthy interest in Python
  • You have a good working knowledge of javascript & a solid understanding of modern front end technologies (HTML/SASS/build tools)
  • You know your way around Git workflows within a team
  • You’re self-motivated, proactive & you love to learn
  • You are accustomed to interacting with APIs to fetch dataPackage

We’re offering competitive compensation, stock options and objective-based bonuses, as well as the opportunity to work with some of the industry’s best. We’re a startup, so free coffee, soft drinks and FIFA are a given, as is a comprehensive private health insurance package. Add to that a discounted Club Med Gym membership and frequent team lunches, aperos and other outings: what are you waiting for?

Backend engineer – API

Paris

The job

To further our rapid growth and satisfy our clients, you will join our engineering team and intervene at the very heart of our API.

Responsibilities

– Design, develop and maintain core components on our platform
– Help us address innovation and growth issue we face everyday
– Stay technologically sharp and offer new ideas & methods so that our platform stays on edge.
– Estimate delivery dates for features along with the team
– Reach the goals set jointly with your manager
– Review Code
– Write and document, quality optimized code

 

Skills required

– Perfect fluency in modern PHP and object oriented programming
– You have used several of these technologies in a high volume environment: memcached, Redis, MySQL, RabbitMQ.
– You know your way around advanced git workflows
– You abide by strict coding standards
– You are rigorous in your work
– Interest in other languages for our SDKs (Java, Go, Ruby, Python, etc.)

Would be a big plus:

– You have done work on an API-based service before
– System / devops skills
– You have already worked in a telecom / VoIP environment
– Experience on MySQL clusters

Package

Attractive : fixed base + stock options + objective-based bonuses

Frontend engineer – UI

Paris

The job

To further our rapid growth and satisfy our clients, you will join our engineering team and intervene on all our client-facing UIs.

 

Responsibilities

– Technical design & development on our Angular2 based client UI.
– Help us address innovation and growth issues we face everyday
– Offer input on our products and the user experience, you will implement
– Stay technologically sharp and offer new ideas & methods so that we always stay on edge.
– Write and document, quality optimized code

 

Required skills

– You are an expert in modern frontend engineering (HTML, SASS, ES6, build tools, module loaders, package management).
– You have an outstanding knowledge of javascript. You know its internals, what’s good, what’s not good and how it’s evolving.
– You have significant production experiences on a major javascript framework.
– You are accustomed to interacting with APIs to fetch data.
– You know your way around advanced Git workflows within a team.
– You are frontend-focused, but you have a very broad understanding of web technologies and the way the various layers interconnect.

 

Preferred skills

– You’ve played around with Angular2 and are familiar with its core concepts (modules, router, services, …).
– You know what RxJS is and have done asynchronous programming with it before.
– You are fluent in Typescript.

It is also a plus if you hold a Masters from an IT or an engineering school.

Package

Attractive : fixed base + stock options + objective-based bonuses

Team Operations

Lead System and Network Engineer

Paris

Stable, scalable and state-of-the-art; this is our aim for CALLR’s platform, and we’re looking for the right person to take it to the next level.

Start-up, telecom operator, and cutting-edge, enterprise-class platform; CALLR brings voice and SMS technology to businesses.

We’re looking for a highly skilled System and Network Engineer with 7-10 years’ experience, to take the lead on all infrastructure subjects. You will be responsible for ensuring the stability and reliability of our platform, contributing to continuous improvement of our technical stack and providing and sharing best practices with the CALLR team.

Why join us?

CALLR is offering the opportunity to work independently on an existing, stable platform with the latest in modern technology. Report directly to our CTO, work on a challenging network project and help build the future CALLR Ops team.

A few figures :

  • Presence in several datacentres (IDF + soon-to-be international)
  • Tens of physical servers
  • Hundreds of virtual machines (ESXi)
  • Network equipment: switching/routing/firewalling Cisco, Juniper and Fortigate
  • We have our own AS (201408) and BGP interconnections
  • Tens of SIP interconnections (operators, clients)

The job :

  • Take the lead on all architecture + operational subjects
  • Improve our multi-datacentre, multi-region architecture
  • Increase performance, availability and scalability
  • Improve our monitoring capabilities across all components (hardware, hypervisor, end-to-end)
  • Work with our talented developers to maintain and improve CALLR’s platform
  • Intervene on-call
  • Hire and manage a sysadmin

The technology

The must-haves :

  • Debian GNU/Linux
  • Ansible
  • MySQL (GTID, advanced replication)
  • Nginx
  • Ability to read code (PHP, JS)

The bonus skills:

  • Telecom experience (Kamailio, FreeSWITCH, Asterisk)
  • Prometheus
  • Splunk
  • VMWare ESXi
  • PHP
  • Python
  • Grafana
  • Sentry
  • Observium
  • Gitlab CI
  • RabbitMQ
  • Docker

We’re offering competitive compensation, objective-based bonuses and stock options, as well as the opportunity to work with some of the industry’s best. Join a small international team of talented people with different backgrounds, interests, cultures but one thing in common: we rock!

We’re a start-up, so free coffee, soft drinks and FIFA are a given, as is a comprehensive private health insurance package. Add to that a central Paris location, a discounted Club Med Gym membership and frequent team lunches, apéros and other outings: what are you waiting for?

Start date: ASAP

Contract type: Permanent (CDI)

Location: Central office in Paris

Technicien Support VOIP N2

Paris

Les missions

Dans le cadre de son développement en France et à l’international, CALLR recherche un technicien support technique niveau 2 pour renforcer son équipe support.

Vous serez en charge d’accompagner les équipes techniques de nos clients dans l’intégration de nos services voix et SMS (Trunk SIP, IAX, SMPP).

Votre rôle est de conseiller nos clients sur l’utilisation de nos services dans leur phase d’
étude et de les accompagner techniquement lors de la phase d’implémentation.

Vos principales missions :
– Accompagnement des clients pour l’intégration de nos services VOIP et SMS
– Participer à l’amélioration de nos services, documentations et processus
– Traitement des incidents

Les compétences requises

– Vous êtes passionné de développement, autonome, réactif et avez le goût du travail en équipe
– De formation Bac+2 type Technicien supérieur informatique
– Expérience en support technique
– Connaissance en VOIP
– Connaissance d’Asterisk, Freeswitch ou Kamailio
– Bon niveau d’Anglais

Si vous maitrisez ces compétences c’est un vrai plus pour nous :
– Linux
– SQL
– Connaissance en développement (PHP ou Python)

Rémunération
La rémunération dépendra de l’expérience et du savoir-faire.
Elle sera composée d’un salaire fixe, de primes sur objectifs et de stock-options.

Technicien Support N2

Paris

Les missions

Dans le cadre de son développement en France et à l’international, CALLR recherche un technicien support technique niveau 2 pour renforcer son équipe support.

Vous serez en charge d’accompagner les équipes techniques de nos clients dans l’intégration de notre API Telecom (voix et SMS).
Il s’agit de conseiller nos clients sur l’utilisation de nos services dans leur phase d’étude et de les accompagner techniquement lors de la phase d’implémentation.

Vos principales missions :
– Accompagnement des clients pour l’intégration de notre API Telecom (voix et SMS)
– Ecrire des exemples de code
– Participer à l’amélioration de nos SDK, documentations et processus
– Traitement des incidents

Les compétences requises

– Vous êtes passionné de développement, autonome, réactif et avez le goût du travail en équipe
– De formation Bac+2 type Technicien supérieur informatique
– Expérience en support technique
– Connaissances en développement (PHP ou Python)
– Bon niveau d’Anglais

Si vous maitrisez ces compétences c’est un vrai plus pour nous :
– Linux
– SQL
– VOIP

Rémunération
La rémunération dépendra de l’expérience et du savoir-faire.
Elle sera composée d’un salaire fixe, de primes sur objectifs et de stock-options.

VOIP Engineer

Paris

To further our international development, CALLR is looking for a Senior Voice Engineer to join our infrastructure team, based in Paris.

Responsibilities

  • Build and maintain Voice interconnexions (SIP)
  • Build and maintain SMS interconnexions (SMPP)
  • Work on new datacenter implementation (POP and Datacenter)

Your skills

  • Strong skills on SIP
  • Strong skills on SMPP
  • Basic knowledge of Linux/Nginx/PHP/Mysql stack

Not required but very helpful skills:

  • Sysadmin skills
  • Worked with MySQL high availability requirements
  • Worked previously for a carrier

About you

  • B.S. Degree in Computer Science, Computer or Electrical Engineering
  • 5+ years hands-on experience operating enterprise-class infrastructure
  • Fluent English
  • Already participated to On call
  • Your goal is to build a “State of the art” platform
  • Your are following M2M evolutions

Perks

Competitive compensation, Stock options and target completion bonuses

Senior Systems Engineer

Paris

To further our international development, CALLR is looking for a Senior Systems Engineer to join our infrastructure team, based in Paris.

Responsibilities

  • Improve scalability, availability and performance of the current infrastructure to be “state of the art”
  • Define multi-datacenter and multi-region architectures (active-active mode)
  • Detect and find a solution to eliminate SPOF
  • On call (1 week per month)

Your skills

  • Experience with linux systems (mostly Debian)
  • Experience with high availability, failover and multi datacenter replication
  • Experience with Memcached, Redis or RabbitMQ in production
  • Experience with MySQL in production
  • Experience with a deployment tool like Ansible, Chef or Puppet
  • Intimate knowledge of HTTP protocols and web services
  • Overview of network protocols

Not required but very helpful skills:

  • Voice and SMS protocols (SIP, SS7 ou SMPP)
  • Network skills (BGP, OSPF)
  • Worked previously for a carrier

About you

  • You know how to build, optimize and maintain a production platform
  • Your goal is to build a “State of the art” platform
  • Interested by DevOPS tools (Docker, Etdc, Consul, Jenkins, …)
  • Fluent English
  • Have previously worked On call
  • Follow best practices

Perks

Competitive compensation, Stock options and target completion bonuses

Team Sales

Customer Sales Manager

Paris

Experienced inbound sales professional looking for a new challenge? Want to spend more time closing sales than cold calling?

If you’re the best at what you do, thrive working autonomously and are passionate about closing deals, we want you.

As a Customer Sales Manager at CALLR, you’ll be responsible for guaranteeing our customers’ success, from sign up through to active user, including closing deals. Our customers come from diverse industries, positions, backgrounds and countries all over the world.

Your mission? Identify the steps of success and guide our customers through the journey in French or English. It’s as simple as that.

What you’ll get to do everyday

  • Handle inbound sales, driving qualified leads to closure
  • Onboard customers via email, SMS or phone: learn who they are, identify their needs, their pain points and problems
  • Detect potential, pre-qualify for sales or support, upsell
  • Optimize the customer success journey
  • Collaborate with Product and Marketing teams to improve the onboarding process and documentation

What we’re looking for

  • Two (2!) people to join our team:

One eloquent native French speaker with exceptional written and spoken English and… (you guessed it!) one eloquent native English speaker with exceptional written and spoken French

  • A proven track record in hitting inbound or outbound sales targets
  • Attention to detail, organized and efficient at prioritising your work
  • Autonomous and proactive, you’re used to making decisions and take responsibility for your failures as much as your successes
  • Minimum 5 years’ experience in a customer sales position, with excellent results
  • Experience selling APIs or B2B SaaS products is a real bonus

What we’re offering

We’re offering very attractive compensation (35-45k fixed) + stock options and commissions, as well as the opportunity to work with some of the industry’s best. Join a small international team of talented people with different backgrounds, interests, cultures but one thing in common: we rock!

We’re a start-up, so free coffee, soft drinks and FIFA are a given, as is a comprehensive private health insurance package. Add to that a central Paris location (in the 2nd) a discounted Club Med Gym membership and frequent team lunches, aperos and other outings: what are you waiting for?

Start date: ASAP

Contract type: Permanent (CDI)

Location: Central office in Paris