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Backend Engineer

Backend Engineer

Backend Engineer, AI Platform(AI/ML)

株式会社BALLAS

Bucharest

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Role description

AIを社会実装するBackend Engineer|図面・設計・調達データをプロダクトへ

Description
AIが扱えない産業データを、AIが扱える形へ

BALLASは、設計・調達・製造・施工にまたがる膨大な業務データを保有しています。

図面、見積、発注、製作図、施工に関するコミュニケーション。

これらは長年、人の経験や暗黙知によって運用されてきた情報です。

私たちは、このデータを構造化し、AIが理解・活用できる状態へ変換することで、建設サプライチェーン全体の生産性向上に挑戦しています。

AI/MLエンジニアが開発したモデルを実際のプロダクトへ組み込み、社会実装するBackend Engineerを募集しています。

具体的な業務

AI・機械学習モデルをプロダクトとして届けるためのバックエンド開発を担当いただきます。

  • AI/MLモデルを利用するAPIの設計・実装
  • FastAPIを用いたAIマイクロサービス開発
  • LLM・マルチモーダルAI機能のプロダクト組み込み
  • Vertex AI、Geminiを活用したAI基盤構築
  • モデル推論基盤の性能改善・スケーリング
  • GraphQL APIの設計・実装
  • AI/MLエンジニアとの協業による社会実装推進
  • SREと連携した運用設計・監視基盤整備

技術環境(2026年6月時点)

フロントエンド

React、Next.js、TypeScript

バックエンド

Python、FastAPI、NestJS、TypeScript、GraphQL、GraphQL

Testing

Jest

AI/ML

Vertex AI、Gemini、Cloud Vision API

Infrastructure

Google Cloud Platform (GCP)、Firebase、Vertex AI、Cloud Vision API、Gemini、Docker、Terraform、PostgreSQL

DevOps

GitHub、Notion、Cursor Agent、Devin、Gemini、Google Cloud Monitoring、Sentry、Google Cloud Monitoring

Design / Collaboration

Figma、Miro、Slack、Notion

このポジションで得られる挑戦

  • AI/MLモデルのPoCから社会実装まで一気通貫で関われる
  • 図面・設計・調達データなど、AIがまだ十分に活用できていない産業データを扱える
  • AI、ソフトウェア、業務オペレーションを横断しながら価値創出に取り組める
  • AI Nativeな産業ソフトウェアの設計・開発経験を積める
  • Backend Engineerとしてだけでなく、AI Platform EngineerやTech Leadへとキャリアを広げられる
  • 急速に進化する生成AI技術を実サービスへ適用し続ける環境で挑戦できる

なぜ、AIだけでは産業は変わらないのか?

多くのAIプロダクトは、既存業務の一部を効率化することに留まっています。

しかし、建設業や製造業のようなリアル産業では、単純な自動化だけでは価値を生み出せません。

そこには

・図面

・仕様書

・見積

・発注

・施工計画

といった膨大な非構造データが存在し、

さらに、

・企業ごとに異なる業務プロセス

・例外だらけの現場判断

・暗黙知に依存した意思決定

が複雑に絡み合っています。

AIが本当に価値を発揮するためには、業務そのものを構造化し、

AIが理解・実行できる状態へ変換する必要があります。

BALLASが取り組んでいるのは、単なるAI活用ではありません。

産業の意思決定をコード化し、再現可能な仕組みとして実装することです。

BALLASとは?

「建設業を最適化し、人々を幸せに。」をミッションに掲げ、建設サプライチェーンをアップグレードするテックカンパニーです。

プラットフォーム運営を通じて設計・調達・製造に携わりながら一次情報を蓄積し、業界の標準化・最適化を推進しています。

リアルなオペレーションをコード化し、AI Nativeな産業インフラの構築を目指しています。

BALLASのプロダクト

BALLASでは「BALLAS SCM」と「BALLAS LINKS」の2つのプロダクトがあります。

・「BALLAS SCM」:自社とパートナー工場様が使うサービスで、設計から製造までのオペレーションをAI Nativeに再設計するためのプロダクトです。

・「BALLAS LINKS」:お客様である建設工事会社様が使うプロダクトです。こちらは、建設工事会社様の内部にある設計・調達プロセスを統合するプロジェクト基盤になります。

今までお客様は、図面の管理にファイルサーバーやクラウド、仕様の協議はメールやチャット、やりとりは口頭と様々なツールを使い分ける状況でした。それを一つに統合することで、認識のズレや余計な工数を大幅に削減できます。さらに、蓄積された作図・購買プロセスデータをもとに、AIによる業務の自動化も進めています。

【参考:BALLASが取り組む課題】

BALLASが挑む建設サプライチェーンの復興──消えゆく町工場と日本の課題

https://youtrust.jp/studio/articles/ballas

代表・木村の起業への想い

なぜBALLASを立ち上げたのか

1400年以上にわたり日本の発展を支えてきた建設業界は、今なお社会インフラを支える巨大産業です。一方で、現場では深刻な職人不足や、アナログで不透明な調達プロセスによる過度な調整負担など、産業全体の生産性を阻害する課題が残されています。

多重請負構造の中で分断されてきた設計・調達・製造・施工のプロセスをデータでつなぎ直し、人とAIが協働できる業務構造へ再設計することで、人が創造的な仕事や本質的な意思決定に集中できる産業を実現したい。

その想いから、BALLASを創業しました。

BALLASが目指すのは、
顧客・パートナーにDXを強制しないDX
です。

建設部材の調達プラットフォーム「BALLAS」は、自らがサプライヤーとして設計・調達・製造に携わりながら一次情報を蓄積し、業界の標準化・最適化を推進しています。「BALLASに頼めば、やり方を変えずに業務が最適化されていく」そんな体験を提供していきたいと考えています。

【参考:サプライヤーBALLASという戦略】

■取締役COO中西「川下から川上へ、サプライチェーンをかえる」

https://note.com/ballas/n/nd8f29e3d2c54

BALLASという組織の3つの魅力

① 産業変革の最前線で、事業と組織の両方をつくるフェーズ

IPOを目指す成長過程にありながら、事業・組織ともに未完成。

仕組みづくりや新たな挑戦の機会が数多くあります。

【参考:投資家対談】

■非住宅分野の工業化(大和ハウス工業とBALLASのチャレンジ)

https://newspicks.com/news/16132298/body/

■AI時代の建設業の在り方(山九株式会社と、BALLASのチャレンジ)

https://note.com/ballas/n/nac0071ddd0dc?magazine\_key\=m2d2c927dffd6

■建設サプライチェーンを絶やさない(日揮株式会社と、BALLASのチャレンジ)

https://note.com/ballas/n/n231c96e140b5?magazine\_key\=m2d2c927dffd6

② AI Nativeな働き方を実践する組織

Claude Code、Cursor、Devin、Gemini などの生成AIツールを組織の標準装備として活用しています。

AIを個人の工夫に留めず、組織の生産性向上につなげる取り組みを推進しています。

【参考:投資家対談】

AIと相性のよいBALLASという事業(Z VCからみたBALLAS)

https://note.com/ballas/n/n8e9b32584463

③ 強みを伸ばしながら成長できる人事制度

マトリクス型キャリアモデルを採用。

マネジメントだけでなく、専門性を高めるキャリアも選択できる環境です。

【参考:BALLASの組織開発】

共同創業者 執行役員 コーポレート本部 責任者益田の記事

https://note.com/ballas/n/nbaa4cb59f8d1

Requirements

  • Pythonのフレームワークを使用したWebアプリケーション開発の実務経験(3年以上目安)
  • Pythonを用いた開発実務経験(3年以上目安)
  • 自社サービス開発・運営を行う企業におけるWebアプリケーション開発の経験(3年以上目安)
  • RDBMS を用いたシステム設計・開発経験
  • Docker に代表されるコンテナ技術を用いたサービス設計・開発経験

Preferred Experiences

  • MLOpsの原則とツールへの精通
  • SaaSプロダクトの開発・運用経験
  • テックリード等の役割で、サービス設計開発を主導した経験
  • AWS、GCP、Azure などのパブリッククラウドについて、IaCツールを用いてインフラ構築を行い運用した経験
  • コンピュータサイエンスの専攻
  • 建設業界のドメイン知識(なくてもキャッチアップ可能)
  • Next.js/TypeScriptを利用したフロントエンド開発経験
  • Nest.js/TypeScriptを利用したバックエンド開発経験

We are looking for

  • AIモデルを作るだけでなく、社会実装まで責任を持ちたい方
  • AI・ソフトウェア・業務オペレーションを横断して価値創出に取り組みたい方
  • API設計やシステムアーキテクチャに関心がある方
  • LLMやマルチモーダルAIを実プロダクトへ組み込むことに興味がある方
  • AI Nativeな産業ソフトウェアをゼロから作りたい方

一緒に働くメンバー

メンバー例

■プロダクト開発部 責任者 濱田

AI Nativeなプロダクト開発

https://note.com/ballas/n/n17474f6ad1c2

■テックリード 片岡

コミュニケーションと情報の最適化で「良いモノづくり」を実現

https://note.com/ballas/n/ncd9a27ac3c4f?magazine\_key\=mf040e7ab6852

■設計DX 大関

リアル×テックで進化する設計 – 構造から変える、建設業の未来

https://note.com/ballas/n/nda4feb73969f?magazine\_key\=mf040e7ab6852

TEAM BALLAS

平均年齢は32.4歳。

若い組織でありながら、設計・施工・調達・生産管理など、それぞれの領域で実務経験を積んだプロフェッショナルが集まっています。

職種や役職に関わらず、互いを尊重しながらフラットに議論し、より良い顧客価値の創出に向き合っています。

また、BALLASには11条からなる「BALLAS信条」があり、メンバー一人ひとりが以下のような価値観を大切にしています。

  • ゴール思考
  • 組織での付加価値最大化
  • 他責にしない

こうした価値観を共有しながら、産業変革に挑戦しています。

Working Conditions

Salary

  • 想定年収800万~1200万円
  • 月給制

※専門業務型裁量労働制を導入

Location

①神田オフィス

東京都千代田区神田須田町2-1-1 MA SQUARE AKIHABARA 5階

②大阪オフィス

大阪府大阪市中央区平野町3-1-6 BizMiiX Yodoyabashi 3階

※配属は応募者様の希望に応じて決定

※リモート勤務可(週1回の出社想定)

Job Type 正社員 Work hours

  • 専門業務型裁量労働制
  • 1日のみなし時間:8時間00分
  • 年間休日120日(内訳:完全週休二日制、土曜、日曜、祝日、年末年始)
  • 有給休暇:入社日に10日付与、入社日後6か月を経過した日に10日付与、入社日後1年ごとに20日付与

Probation period 有 3か月(最大6か月、試用期間中の勤務条件:有機雇用契約) Benefits

■ AI Nativeな組織

Claude Code、Cursor、Devin、Gemini などの生成AIツールの利用可能。

AIを個人利用のツールではなく、組織の標準装備として位置づけています。

日々の情報収集、ナレッジ共有、資料作成、意思決定支援などに生成AIを活用し、人がより本質的な課題解決や創造的な仕事に集中できる環境づくりを進めています。

■ その他

社会保険完備(健康保険・厚生年金・雇用保険・労災保険)

業務用PC貸与

書籍購入、資格取得、セミナー参加等の学習支援制度

カフェ代補助

AIツール利用環境の提供

Company information

Name 株式会社BALLAS Established 2022年2月 Headquarter Location 東京都中央区銀座一丁目22-11 銀座大竹ビジデンス2階 Capital 100,000,000円 Employees 60名(2024年7月時点)

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Backend Engineer

Data Platform Expert

Undelucram.ro

Bucharestfulltimelead

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Role description

Undelucram.ro on behalf of:

Capgemini Romania
Choosing Capgemini means choosing a company where you will be empowered to shape your career in the way you’d like, where you’ll be supported and inspired by a collaborative community of colleagues around the world, and where you’ll be able to reimagine what’s possible. Join us and help the world’s leading organizations unlock the value of technology and build a more sustainable, more inclusive world.

About The Job
The Data Platform Expert is responsible for leading the strategy, architecture, and management of an organization's data infrastructure. Responsible with overseeing teams that build and maintain data platforms, ensure data quality and security, and enable data-driven decision making across the company.

YOUR ROLE

  • Enterprise Data Platform architecture documentation
  • Cloud-based data platforms and modern analytics architectures definition & implementation
  • Data modelling (Conceptual, Logical and Physical models).
  • Data Warehouse, Data Lake, Lakehouse and Data Product architectures.
  • Data Governance and Data Management principles.
  • Data ingestion, transformation, storage, exposure and consumption patterns.
  • Security, access management and operational considerations for data platforms.
  • Monitoring

YOUR PROFILE

  • Experience 8+ years on a similar role
  • Tech skills: Datalake, DWH, Lakehouse
  • Strong problem-solving and cross-functional communication skills to align infrastructure with business goals

WHAT YOU'LL LOVE ABOUT WORKING HERE:

  • Flexible and dynamic work environment involving teams spread across different global locations;
  • Communities with shared interests and identities, all working together to advance diversity, equity and inclusion within the workplace and society;
  • Do you want to learn more? You will have access to various training programs and platforms (e.g.: content provided by Pluralsight, Harvard and Coursera);
  • Attractive benefits package (meal tickets, medical services, Benefit online, Employee Share Option Plan).

Capgemini is an equal opportunity employer. We promote equality and dignity in all aspects of recruitment and employment, and all offers of employment and promotions are made on the basis of performance, competence and ability.

About Us
Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organizations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2024 global revenues of €22.1 billion.

Make it real | www.capgemini.com

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

Backend Engineer

Senior Backend Developer

Danfoss

Bucharestsenior

Apply on the employer's site

Role description

The Impact You'll Make
Danfoss Group IT is seeking an
experienced developer
to forefront our integration initiatives and drive the continued improvement of our application portfolio in
Azure cloud.
In this pivotal role, you will be responsible for designing, developing, and deploying robust and scalable enterprise-level integrations.

You will be part of the Digital Customer Experience (DCE) team, with more than 125 international colleagues, where we develop, support, and lead the digital customer experience in Danfoss. We connect business needs and IT into digital solutions.

If you are passionate about building innovative solutions on Azure and have a proven track record of delivering high-quality results, we encourage you to apply with your cv in the English language.
The position is open in our locations in Slovenia, Croatia, Poland and Romania.
The job shall be hybrid.
What You’ll Be Doing

  • Design and implement event-driven integrations (Azure Event Grid and Azure Service Bus) and serverless functions following MACH principles.
  • Utilizing Azure CDN to serve assets and ensure the best possible user experience.
  • Develop and maintain Infrastructure as Code (IaC) solutions using Bicep.
  • Ensure adherence to Microsoft Azure security best practices and industry standards including access controls, data encryption, and vulnerability management.
  • Establish and maintain a robust CI/CD pipeline using Azure DevOps to automate the build, test, and deployment processes.

What We're Looking For

  • Proven professional experience in Azure integration technologies, including Azure Functions, Azure Event Grid, Azure Service Bus, and Azure API Management.
  • Strong proficiency in .NET development and C#.
  • Solid understanding of serverless architectures and cloud-native principles.
  • Expertise in Infrastructure as Code (IaC) using Bicep or Terraform.
  • Experience with CI/CD pipelines and tools like Azure DevOps.
  • Deep knowledge of security best practices and compliance standards.
  • Strong communication and collaboration abilities.
  • Proficiency in spoken and written English.

What You'll Get From Us

  • We promote from within and support your learning with mentoring, training, and access to global opportunities.
  • You’ll have flexibility, autonomy, and support to do your best work while maintaining a healthy work-life balance. Your well-being matters to us.
  • We strive to create an inclusive work environment where people of all backgrounds are respected, and valued for who they are.
  • Together with your employment we provide non salary benefits that we share with your during the recruitment process.

Ready to Make a Difference?
If this role excites you, we’d love to hear from you! Apply now to start the conversation and learn more about where your career can go with us.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or other protected category

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

Backend Engineer

Backend Software Engineer

VOIS

Bucharestsenior

Apply on the employer's site

Role description

Who We Are
VOIS (Vodafone Intelligent Solutions) is a strategic arm of Vodafone Group Plc, creating value for customers by delivering intelligent solutions through Talent, Technology & Transformation.

As the largest shared services organisation in the global telco industry with 30,000 FTE, our portfolio of next-generation solutions and services are designed in partnership with customers across Vodafone Group, local markets, and partner markets to simplify and drive growth. With our strategic partner Accenture, we work alongside our Vodafone customers, other Telco and tech companies to drive transformation, meet the challenges of our industry and ensure we stay relevant and resilient. This partnership is a unique, industry-first model which brings together the best of in-house and 3rd party capability.

We work with customers across 28 countries from 10 VOIS locations: Albania, Egypt, Hungary, India, Romania, Spain, Turkey, UK, Germany, Ireland, and with a network of teams in Czech Republic, Italy, Greece, and Portugal.

#VOIS #BeUnrivalled #CreateTheFuture

About This Role
We are seeking a Senior Software Developer to design, build, and support scalable software solutions within VOIS Technology. This role involves end-to-end development, from implementation and configuration to testing and operational support, with a strong focus on code quality, collaboration across distributed teams, and delivery of robust backend services.

What You’ll Do

  • Develop well-structured, maintainable, and documented code in line with organisational standards
  • Document system improvements, enhancements, and technical changes
  • Collaborate effectively within distributed, cross-country and cross-time-zone teams
  • Contribute to multiple projects simultaneously while ensuring timely delivery
  • Provide accurate time and effort estimates for implementing technical specifications

Who You Are

  • Experienced in Java (11+) and Spring Boot for backend development
  • Skilled in designing, developing, and integrating RESTful APIs
  • Knowledgeable in backend security best practices
  • Strong understanding of unit testing and Test-Driven Development (TDD)
  • Familiar with microservices architecture and event-driven systems
  • Solid foundation in object-oriented programming principles.In-depth understanding of the software development lifecycle
  • Proven experience (minimum 5 years) across technologies including Java Enterprise, Python, JavaScript, TypeScript, Node.js, React, Angular, and working with both relational and non-relational databases

Not a perfect fit?
Concerned you may not meet every requirement? Vodafone is committed to creating an inclusive workplace where everyone can thrive. If you are excited about this role but your experience does not align exactly with every aspect of the job description, you are encouraged to apply. You may be the right candidate for this or another opportunity, and the recruitment team will support you in exploring where your skills fit best.

What's In It For You

  • Hybrid way of working: 2 days per week/ 8 per month
  • Medical and dental services
  • Life and hospitalization insurance
  • Dedicated employee phone subscription
  • Take control of your benefits and choose any of the below options: meal tickets/private pension/vacation vouchers/cultural vouchers within the budget
  • Special discounts for gyms and retailers
  • Annual Company Bonus
  • Ongoing Education – we continuously invest in you to ensure you have everything needed to excel on the job and enhance your skills
  • You get to work with tried and trusted web-technology
  • We let you write your own story by planning vacations: go for a trip, experience new things, have fun and enjoy your 23 days off
  • Special Paternal Program - 4 months of paid paternity leave

What Skills You Will Learn

  • Advanced backend development techniques using modern Java frameworks
  • Scalable system design and distributed architecture patterns
  • Practical application of security standards in enterprise environments
  • Strengthened collaboration and communication in global, agile teams
  • Estimation, planning, and delivery of complex technical solutions

VOIS Equal Opportunity Employer Commitment
Vodafone recognises and celebrates the value of diversity in building a workforce that reflects the customers and communities it serves. No form of discrimination is tolerated. This includes, but is not limited to, discrimination based on race, colour, age, veteran status, gender identity, gender expression, sexual orientation, pregnancy, maternity or parental status, ethnicity, disability, religion or belief, political affiliation, trade union membership, nationality, citizenship, indigenous status, medical condition, HIV status, neurodiversity, social origin, cultural background, marital or civil partnership status, or socio-economic background.

Join Us
At Vodafone, we’re working hard to build a better future. A more connected, inclusive and sustainable world. As a dynamic global community, it's our human spirit, together with technology, that empowers us to achieve this.

We challenge and innovate in order to connect people, businesses, and communities across the world. Delighting our customers and earning their loyalty drive us, and we experiment, learn fast and get it done, together.

With us, you can truly be yourself and belong, share inspiration, embrace new opportunities, thrive, and make a real difference.

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This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

Backend Engineer

Java Developer | Build Systems That Guide Aircraft, Not Ads

Thales

Bucharestlead

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Role description

Location: Bucharest Orhideea, Romania

Thales is a global technology leader trusted by governments, institutions, and enterprises to tackle their most demanding challenges. From quantum applications and artificial intelligence to cybersecurity and 6G innovation, our solutions empower critical decisions rooted in human intelligence. Operating at the forefront of defence and security, aerospace and space, cybersecurity and digital identity, we’re driven by a mission to build a future we can all trust.

In Romania, we are advancing innovation through software engineering, research and development, delivering solutions in key markets in which Thales Group operates. Our engineers design, develop and integrate solutions that impact global industries – from fully operational systems and subsystems for naval warfare and maritime security operations, to air traffic management systems, satellite-based solutions, tactical indoor simulations, identity and biometric technologies and more.

🛫
Your code will run where failure isn't an option
We're Thales ECC Bucharest, one of the fastest-growing engineering centers in the city. We build software for air traffic, defence, and critical infrastructure across Europe. Not another CRUD app. Systems that stay up when everything else goes down.

THE WORK:
Java backend engineering across the full lifecycle, on long-horizon European programs. REST APIs, services, and platforms with real domain complexity, real users, real stakes.

YOUR STACK:
Java 11+, Spring / Spring Boot, microservices, REST, CI/CD. Kafka, Docker, K8s are a plus, not a gate.

YOU:
2+ years as a Java or backend engineer, curiosity about the domain, and the patience to build things that last a decade, not a sprint. Not ticking every box? Apply anyway. We hire for trajectory, not checklists.

🤝🧑‍💼
WHAT'S IN IT FOR YOU:
Competitive package, private medical care, meal tickets, flexible/hybrid working, learning budget and certifications, and the stability of a group that has been building critical technology for 130 years.

🗼
FRENCH TRACK:
French is a multiplier here, never a requirement. Our French-language programs are growing quicker than we can staff them, and if you speak it, we pay attention to that in the offer.

🚀
WHAT HAPPENS NEXT:
This is an open door, not a single vacancy. We hire Java continuously across our programs. Apply in five minutes, no cover letter. Answer a few short questions about your stack and seniority, and a recruiter dedicated to your domain takes it from there. When the right project opens, you're matched first, at your level, on your timeline.

5️⃣⏱️
One application. Five minutes. No cover letter.
At Thales, we’re committed to fostering a workplace where respect, trust, collaboration, and passion drive everything we do. Here, you’ll feel empowered to bring your best self, thrive in a supportive culture, and love the work you do. Join us, and be part of a team reimagining technology to create solutions that truly make a difference – for a safer, greener, and more inclusive world.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

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