Backend Engineer

# Backend Engineer - Confirmed## Batvoice AI is hiring## Job DescriptionBatvoiceAI is looking for a **Confirmed Backend Engineer** to increase our operational capacity. We have ambitious projects coming up in the line and would like to be able to tackle more of them per cycle, without compromising on our core **Infrastructure** concerns and investigation. As such, we're looking for someone that's going to be comfortable with code (as you will be doing more Dev than Ops), but doesn't shy away from Ops work either.You will collaborate with:* The rest of the **Application** team (**Backend** focus). You will be leading projects that you have the competencies for, and participating in projects where you have some bring-up to do (so that eventually you can lead those as well).* The **Operations** team, who you will be helping out with investigative (BUILD phase) and maintenance (RUN phase) **Infrastructure** tasks, but you won't be leading entire projects in this space (unless you want to).* The **Data** team, who you will solicit when interacting with our data processing and machine learning components.Put differently, this job is made for you if you like to think about programs from many angles: functional, design, implementation, deployment, and infrastructure. You don't have to be competent in all of them, but you need to be interested. This is the place for you if you want to understand how the whole thing works.### The Challenges* **Mutualisation** : up to now, the solution has been tweaked for each individual client, leading to sprawl. Now that we have a solid footing, we want to start unifying bits and pieces. Away from a monolith that swaps out entire parts depending on who the client is and towards a system that'll work for everyone and won't incur different maintenance cost for each. For example, instead of searching text using **Postgres**' FTS and indexing based on trigrams, we'd like to move to **ElasticSearch**, which would run faster and serve everyone's needs better, without the need for per-client transforms. You'll participate in figuring out what the best solution is (on both the Code and the Infra sides) in each case and then participate in implementing it.* **Modernization** : while we were rushing to get established, there wasn't much time for upkeep, while the world kept moving on. We're now stuck on an old version of python, an old version of django, and can't take advantage of new developments in the field. We want to move to using , dividing the monolith into workspaces rather than one big codebase, update to a newer python (we'd love to get to 3.14 to get both the new JIT and the free-threaded interpreter), and more. We don't just want the application to work, and we don't just want the application to work well : we want it to be pleasant to work on too. We love engineering, and hopefully, if you apply, you do as well.### The Environment* We are a **fully remote** company, though we do make physical offices available if you prefer those. Regardless of this, you must have the right to work in France, and to live in Europe or North Africa.* We do not measure seniority by years of experience, but in terms of results and ability, leading to rapid advancement opportunities.* We offer comprehensive healthcare coverage through for you and your family (50% participation).* From their second year onward, team members who demonstrate strong commitment and motivation may be granted stock options, reflecting their contribution to BatvoiceAI’s long-term success and journey.## Preferred ExperienceResearch has shown that having strict quantitative requirements discourage applicants that would have otherwise performed well at the position from applying. As such, instead of experience, we define skills you should have. Important: even though this offer mentions some tools, having a skill does not mean knowing a specific tool. It can be a double-edged blade: you may not need experience with a tool, but having it isn't a big advantage; you'll need to show actual ability.Combined with our public definition of , as well as our company , we encourage you to apply if you believe you are a good fit for our needs, provided you can justify it in some way. We document how we make hiring decisions in our public document, which should similarly give you an idea as to whether you are likely to be selected.* VCS: we use **Git** and **GitHub**, and we appreciate well-formatted, well-written atomic commits that turn into clear and consistent pull requests. If you follow the , you already exceed expectations.* Software development: our codebase is in **Python** with **Django**. If you have never used either, that is fine, but then you will have to show that you will not have any issues getting good at them quickly.* Databases: we currently use **PostgreSQL** with **TimeScaleDB** through Django's ORM with the intent of moving data to another storage engine, e.g. **Elasticsearch**. Therefore, you should be comfortable with SQL and open to other kinds of databases.* Infrastructure and deployment: we use AWS with **OpenTofu**, **Kubernetes**/EKS with **Helm** and **Flux CD**. We're looking into on-premise deployments as well. You won't be working on these directly necessarily, but you need to have a solid understanding of what these things are and how they work in order to interact with them (or at least to be willing to learn quite quickly).* Data processing: the core of our business is processing data; we currently leverage **Argo Workflows** and intend to move to another solution in the future. You should understand the concept of a data pipeline (whether it's ETL, ELT or any other approach) and be able to reason about the pipeline as a whole.* **Teamwork**: our Engineers should not silo or work silently, an importance that is ever greater in a fully remote company. This position requires a mix of autonomy, discipline, cooperation, and communication.* Human languages: **English** is our working language, but our clients speak **French** -- being proficient in both languages is definitely an asset.* Bonus ultime: experience with ASR (Audio Speech Recognition) and scikit-learn. If you have these, you'll be able to help the Data team out as well, if that interests you.We're aware that the Venn diagram of "Software Engineering" and "Infrastructure" is not very big. The original point of "DevOps" was to merge the two practices partly, to avoid Engineers that write things that cannot ever run well, or Sysadmins that don't know how to do any capacity planning (for example, giving an IO bound application 500 CPUs and 1GB of RAM). As such, we're really going to be looking out for two kinds of profiles:* People that are competent software engineers, but are comfortable with infrastructure and are conscious of deployment processes.* People that are the modern definition of "DevOps", but aren't afraid to get their hands dirty writing code (this position *is* predominantly more Dev than Ops).* Contract Type: **Full-Time*** Start Date: **23 February 2026*** Location: **Paris*** Education Level: **No Diploma*** Experience: **> 3 years*** **Possible full remote*** Salary: **between 42000€ and 48000€ / year** #J-18808-Ljbffr