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

Lead Product Engineer – UI

Paris

The job

To further our rapid growth, you will join our engineering team and lead engineers that are working on our client-facing UIs.

You will work hand-in-hand with our Engineering and Product Managers, to ensure smooth delivery of quality user interfaces.

 

Responsibilities

  • Lead a team of up to 5 front-end engineers. Define, estimate tasks and track their progress, make informed technical choices, handle day-to-day issues.
  • Discuss roadmap with the Engineering Manager as needed.
  • Work with our design team & product manager to make thoughtful UX choices.
  • Technical design & development on our Angular2 based client UI.
  • Stay technologically sharp and offer new ideas & methods so that we always stay on edge.

 

Required skills & experience

  • You have previous experience managing small technical teams in an agile way.
  • You have a very strong creative and user experience sensibility that defines your approach to front-end engineering.
  • You are an expert in modern front-end engineering (HTML, SASS, ES6, build tools, module loaders).
  • You have an outstanding knowledge of javascript.
  • You have significant production experiences on a major javascript framework.
  • 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.

 

Package

Very attractive : fixed base + stock options + objective-based bonuses + perks.

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

Telecom 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