Senior backend & Devops Engineer

Context
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Vizzia's IoT platform is what lets operations teams monitor the fleet of cameras deployed across French local authorities, get alerted when something breaks, and intervene before it impacts a city. FleetAPI, device provisioning, the routing and monitoring services — these are the backend systems that carry the day\-to\-day product. 250\+ local authorities now rely on Vizzia to keep their streets clean and safe. As the fleet grows, the backend services that power monitoring, alerting and intervention need a dedicated owner: someone who ships robust APIs, keeps the services reliable in production, and makes the underlying AWS infrastructure evolve when the product needs it to. You will join a 4\-person team (Tech Lead, PM, one engineer, one incoming full\-stack hire) reporting to Wilfried as Tech Lead. Your mission: develop, maintain and evolve the backend and cloud services of the IoT platform — with the backend side as the core of your day\-to\-day, and the cloud side as the foundation it runs on.

What You'll Do
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1\. Backend services and APIs for fleet monitoring, alerting and intervention

• Develop and maintain the backend services that give operations teams the tools to monitor the camera fleet, get alerted, and intervene.


• Ship APIs and backend services in Python / Node.js / TypeScript that are robust, tested, observable, and documented.


• Own the evolution of the existing APIs and the surrounding services as the product and the fleet grow.

2\. IoT verticals ownership

• Within the first 6 months, take ownership of one major technical domain : provisioning, fleet drift detection, or the routing \& monitoring stack, with a measurable improvement on either reliability or operational quality.


• Work day\-to\-day with the OpenVPN multi\-shard architecture and the router fleet: connectivity, segmentation, scaling the shards horizontally as the fleet grows.

3\. AWS architecture and Infrastructure as Code

• Handle the AWS architecture supporting the team evolves where the product needs it to: compute (Lambda, ECS, Batch), networking, storage, IAM.


• Arbitrate trade\-offs (serverless vs container, SQL vs NoSQL) based on facts.

4\. Observability and production incident response

• Instrument, alert, and debug the backend services in production, with tooling like CloudWatch, Datadog or Grafana.


• Participate in the on\-call rotation on your perimeter. Write post\-mortems. Keep runbooks current. Every incident produces an artifact the team can use next time.


• Drive a measurable reduction of mean time to remediation on the services you own.

5\. Pairing and cross\-team architecture

• Pair with the Tech Lead and the full\-stack engineer from the spec stage — infra\-aware design starts before code is written.


• Within 12 months, represent the team in cross\-team architecture discussions (Platform, Data Platform, NetSec, AI) and participate to the technical arbitrations.

Who You Are
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• A least 4 years of experience in backend and cloud engineering, with at least 2 years on AWS in production environments.


• Strong backend development in Node.js / TypeScript or Python at production grade, services that are tested, observable, and hold up under load.


• Daily practice of Infrastructure as Code (CDK is what we use; Terraform or equivalent is a fine background), CI/CD, and observability.


• You have run real production incidents and can walk through a timeline, the decisions made, and the post\-mortem that came out of it.


• Comfortable with both serverless and classic servers paradigms. You explain a technical position with concrete elements, hear a counter\-argument, and update when it's justified.


• IoT, telecom, or distributed systems at scale (MQTT, AWS IoT Core, Kinesis, Step Functions) is a bonus.

At Vizzia, we care about precision, ownership, and moving things forward. We're looking for someone who's curious and genuinely interested in IoT and usercentric approaches.

Benefits
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Hybrid work

Contrat cadre and RTT (between 8 and 12 days per year depending on public holidays)

A Mac or PC depending on your preferences

BSPCE

60% coverage of meal vouchers worth €9 per worked day

/ Sustainable mobility allowance

Mutuelle (Alan)

Offices located in central Paris (9th arrondissement)

Annual offsite with the whole team and plenty of company events

Recruitment Process
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• Intro call with Marine (Talent Acquisition Manager) \- 30 min


• Technical deep\-dive with Wilfried (Tech Lead) \- 1 hour


• Live pair\-coding and architecture discussion with Jérôme (Head of Infra) \- 1 hour


• Product and team fit \- 30 min


• Final sign\-off with Alexandre

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