Erlang Solutions
- Founded
- 1999-01-01 in London, United Kingdom
- Headquarters
- London, United Kingdom
- Phone
- +44 20-7456-1020
Erlang Solutions is the world’s leading expert in building massively scalable, fault-tolerant distributed systems using Erlang, Elixir, and BEAM technologies. Founded in 1999 as Cesarini Consulting by Francesco Cesarini, the company has grown from a one-person consultancy into a global technology firm with offices in London, Stockholm, Kraków, Budapest, and New York. With over 20 years of experience, Erlang Solutions helps clients ranging from startups to Fortune 500 companies—including WhatsApp, Klarna, Ericsson, and Motorola—design, build, and operate systems that handle billions of transactions without error. The firm’s strength lies in its unique combination of consultancy, managed support and training, and community engagement through major conferences like ElixirConf EU and Code BEAM events. It also maintains official binary distributions of Erlang and Elixir and develops its own enterprise XMPP server, MongooseIM. The team of approximately 120 people combines deep technical expertise with a community-first ethos. In early 2026, founder Francesco Cesarini stepped down, marking a leadership transition toward a team of Business Unit Leaders.
Detailed Review
History and Founding
Erlang Solutions traces its roots to 1999, when Francesco Cesarini founded Cesarini Consulting after Ericsson open-sourced the Erlang programming language in 1998. The company’s first customer was Ericsson Sweden, and it quickly expanded into training, internships, and conference organization. Over the years, ESL became the go‑to consultancy for companies needing resilient, soft real‑time systems, particularly in telecom, instant messaging, ad tech, fintech, and IoT.
Core Services
Today, ESL’s core service offering is structured around three pillars: Consultancy – full‑lifecycle development for distributed systems, from architecture reviews to production deployment and 24/7 support, with clients including high‑traffic platforms such as WhatsApp and Klarna. Capabilities – managed support plans for Erlang/OTP, Elixir, RabbitMQ, MongooseIM, and EMQx, plus public and private training courses and a certification program. Community – ESL is the force behind the Code Sync conference series (ElixirConf EU, Code BEAM Europe, Code BEAM America) and maintains the official binary packages for Erlang and Elixir downloads; it also contributes to open‑source projects like MongooseIM, WombatOAM, and the Erlang/OTP repository.
Proprietary Products
Key proprietary products and platforms include MongooseIM, an enterprise‑grade XMPP messaging server optimized for instant messaging and IoT; WombatOAM, an operations and maintenance tool for managing Erlang nodes in production; and binary distributions of Erlang/OTP and Elixir used by the global developer community. ESL also offers tailored support packages for RabbitMQ, the popular AMQP message broker.
Business Model and Market Position
ESL is privately held and self‑funded; it does not disclose revenue. The company employs around 120 people across five offices, with a strong remote‑friendly culture that blends technical excellence with a community‑first ethos. It competes in the niche of BEAM‑based consultancy, positioning itself as the world’s leading expert in Erlang and Elixir systems, serving both startups and Fortune 500 companies.
Leadership Transition
In early 2026, founder Francesco Cesarini announced his departure as Technical Director, signaling a shift toward a team of Business Unit Leaders who will drive strategy and operations. As of the research date, no CEO, CTO, or COO has been publicly announced; the leadership structure is now composed of regional Business Unit Leaders for Nordics, Americas, Kraków, and London.
Key Products
Erlang/OTP & Elixir Packages
Official binary downloads for Erlang OTP and Elixir, maintained for multiple platforms.
MongooseIM
Enterprise XMPP messaging server designed for massive scalability in instant messaging and IoT.
WombatOAM
Operations and maintenance tool for monitoring and managing Erlang nodes in production.
RabbitMQ Support
Commercial support and consulting for RabbitMQ, the open‑source message broker.
Consultancy Services
Architecture, development, and support for bespoke distributed systems using Erlang, Elixir, and BEAM technologies.
Training & Certification
Public and private courses covering Erlang, Elixir, Phoenix, OTP, and more, with certification options.
Code Sync Conferences
Portfolio of community events including ElixirConf EU, Code BEAM Europe, and Code BEAM America.
Offices & Headcount
120 employees (approx.)
Key Persons
- Francesco Cesarini
Founder & Technical Director (exiting)
- Erik Schön
Managing Director, Nordics