Stateful Services Engineer

Build the infrastructure behind the next generation of AI-powered customer communications Diabolocom is building an AI-first communication platform where AI and human agents, business workflows and communication channels work together seamlessly. As we enter our next phase of growth, we are looking for a Stateful Services Engineer to help build and operate the infrastructure foundation behind the platform. This is a unique opportunity to work on an infrastructure environment combining carrier-grade voice systems, on-premise data centers, distributed systems and AI workloads , while helping us build the reliability and operational maturity required to support 3x growth . You will report to the newly forming Stateful Services Lead and work closely with Engineering, SRE and Infrastructure teams to improve the reliability, scalability and evolution of our stateful systems. Your mission Your goal is to build, operate and improve Diabolocom’s stateful services , with a strong focus on databases and data stores. You will help ensure that our databases and stateful systems remain highly available, reliable and performant, while evolving our infrastructure so that maintenance, upgrades and scaling can be performed safely and with minimal to no downtime. Working closely with the Stateful Services Lead, you will take ownership of specific technical projects and contribute to the evolution of our stateful infrastructure. You will:

• Operate and maintain our stateful services , including PostgreSQL, ClickHouse, Redis, RabbitMQ and Kafka/Redpanda.
• Contribute to the design, evolution and scaling of our database infrastructure, with 50+ PostgreSQL clusters and increasingly complex data workloads.
• Work on projects aimed at making database maintenance, upgrades and migrations safer and less disruptive to our services.
• Improve high availability, replication, failover, backup/restore and disaster recovery across our stateful systems.
• Contribute to rebuilding our PostgreSQL clusters to support automatic failover between data centers and reduce the impact of maintenance operations.
• Help improving our queueing infrastructure, including projects such as quorum-based RabbitMQ .
• Help building and maintaining stable Redis infrastructure and improve the reliability of our stateful services.
• Investigate and solve complex performance, scalability and reliability issues across databases and distributed systems.
• Work closely with development teams to understand their needs, support their use of databases and help them build reliable solutions.
• Collaborate with SRE, networking and infrastructure teams to ensure that our stateful services operate reliably within our broader infrastructure.
• Contribute to monitoring, automation and operational practices that make our infrastructure easier and safer to operate.
• Participate in our on-call and incident management rotation , helping diagnose and resolve production issues when needed.
• Stay hands-on and close to the technology: you will be expected to understand how our systems work, how they fail and how to improve them. Who we are looking for We’re looking for a technically strong and hands-on Stateful Services Engineer who enjoys solving complex infrastructure problems and taking ownership of production systems where reliability really matters. You have experience operating databases or stateful services in production and understand that running these systems is about much more than simply maintaining them. You know how to troubleshoot them, how they behave under load, how they fail, and how to make them more reliable as they scale. You’ll work on specific technical projects defined with the Stateful Services Lead, while having the autonomy to investigate problems, propose solutions and contribute to technical decisions. We care more about your technical depth, curiosity and ability to take ownership than the exact number of years of experience you have. Must Have
• Strong hands-on experience as a DBA, Database Engineer, SRE or similar , with solid experience in PostgreSQL .
• Experience operating and maintaining production databases, including upgrades, migrations, replication, backups, recovery, monitoring and performance troubleshooting.
• Good understanding of high availability and reliability for stateful systems: failover, redundancy, replication, disaster recovery and minimising downtime during maintenance.
• Good understanding of distributed systems , including replication, consistency, fault tolerance and the challenges of operating stateful services at scale.
• Experience working with on-premise infrastructure or a willingness and ability to quickly adapt to an on-premise/bare-metal environment.
• Good system design skills and the ability to reason about scalability, reliability and performance.
• Experience collaborating closely with software development teams , understanding their requirements and helping them build reliable solutions around databases and stateful services.
• Strong troubleshooting and problem-solving skills, with the ability to investigate complex production issues.
• Strong hands-on mindset: you enjoy getting into the technical details and solving problems yourself.
• Comfortable participating in on-call and incident management .
• Fluent English, both written and spoken. French or other languages are a plus. Nice to Have Experience with some of the following:
• ClickHouse or another complex database/data platform.
• Kafka or Redpanda and event-streaming infrastructure.
• RabbitMQ , particularly quorum-based configurations.
• Redis and distributed caching.
• Other database technologies such as Elasticsearch/OpenSearch, MySQL, Cassandra or MongoDB.
• Advanced Linux systems administration, including processes, storage, networking and troubleshooting.
• Bare-metal infrastructure and data-center environments.
• Observability and monitoring of stateful systems.
• Capacity planning, performance analysis and load testing.
• Infrastructure automation and configuration management.
• Incident management, root-cause analysis and post-mortem practices. About You
• You take ownership. When you see a reliability or scalability problem, you investigate it and work towards a solution.
• You are genuinely technical. You like understanding how things work under the hood and are comfortable diving deep when something breaks.
• You think in systems. You understand that databases don't operate in isolation and enjoy working across infrastructure, networking, SRE and development teams.
• You care about reliability. You want systems that can be maintained, upgraded and scaled without putting the business at risk.
• You are pragmatic. You can make sensible technical trade-offs in complex environments.
• You are curious and self-driven. You learn by doing, investigate unfamiliar technologies and are comfortable figuring things out independently.
• You enjoy solving complex problems. You like working on systems where there isn't always an obvious answer.
• You communicate clearly. You can explain technical topics and work effectively with the teams relying on your services.
• You are comfortable taking responsibility. You don't need to be a manager to have an impact or take the lead on a technical problem. Why join us
• Own critical infrastructure: your work will directly impact the reliability and scalability of Diabolocom’s platform.
• Solve complex technical challenges: work with large-scale databases and stateful services, including PostgreSQL, ClickHouse, Kafka, Redis and RabbitMQ.
• Work on real infrastructure challenges: help improve PostgreSQL clusters, cross-data-center failover, RabbitMQ and Redis reliability.
• Stay hands-on: spend your time solving challenging technical problems rather than managing people.
• Learn and grow: work across databases, distributed systems, messaging and infrastructure in a diverse technical environmen