Senior Java Developer

Role –
Senior Java Developer

Technology
– Java/AWS

Location
– Cluj, Romania, US TIME Zone. EEST 13pm-22pm

Job Description
Today, the corporate landscape is dynamic and the world ahead is full of possibilities! None of the amazing things we do at Infosys would be possible without an equally amazing culture, the environment where ideas can flourish and where you are empowered to move forward as far as your ideas will take you.

At Infosys, we assure that your career will never stand still, we will inspire you to build what’s next and we will navigate further together. Our journey of learnability, values and trusted relationships with our clients continue to be the cornerstones of our organization and these values are upheld only because of our people.

Your role
In the role of Lead developer, you will interface with key stakeholders and apply your technical proficiency across different stages of the Software Development Life Cycle including Requirements Elicitation, Application Architecture definition and Design. You also deliver high quality code deliverables for a module, lead validation for all types of testing and support activities related to implementation, transition and warranty. You will be part of a learning culture, where teamwork and collaboration are encouraged, excellence is rewarded, and diversity is respected and valued.

Required

• Work on application enhancement and support - Java based application deployed on AWS cloud
• Proficiency in PostgreSQL and other relational databases.
• Ensure high availability, fault tolerance, and scalability of services.
• Write clean, maintainable, and well-documented code.
• Conduct unit testing and integration testing.
• Identify and address performance bottlenecks.
• Ensure data security and compliance.
• Bachelor’s degree in Computer Science or related field.
• Minimum of 8 years of professional experience as a Backend Engineer.
• Spring Batch, Springboot and Java for backend development
• PostgreSQL and relational databases
• Building and consuming RESTful APIs

Preferred

• Experience with:
• AWS Cloud services
• JIRA, GIT, ServiceNow
• GitHub CoPilot
• Familiarity with DevOps practices - Pipeline, EKS, S3
• Excellent problem-solving skills and attention to detail.
• Strong communication and collaboration abilities.

Personal
Besides the professional qualifications of the candidates we place great importance in addition to various forms personality profile. These include:

• High analytical skills
• A high degree of initiative and flexibility
• High customer orientation
• High quality awareness
• Excellent verbal and written communication skills

About Infosys
Infosys is a global leader in next-generation digital services and consulting. We enable clients in 46 countries to navigate their digital transformation. With over three decades of experience in managing the systems and workings of global enterprises, we expertly steer our clients through the many next of their digital journey. We do it by enabling the enterprise with an AI-powered core that helps prioritize the execution of change. We also empower the business with agile digital at scale to deliver unprecedented levels of performance and customer delight. Our always-on learning agenda drives their continuous improvement through building and transferring digital skills, expertise and ideas from our innovation ecosystem.

Visit www.infosys.com to see how Infosys can help your enterprise navigate your next.

All aspects of employment at Infosys are based on merit, competence and performance. We are committed to embracing diversity and creating an inclusive environment for all employees. Infosys is proud to be an equal opportunity employer

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）

Who We Are
SiriusXM
and its brands (Pandora, SiriusXM Media, AdsWizz, Simplecast, and SiriusXM Connect) are leading a new era of audio entertainment and services by delivering the most compelling subscription and ad-supported audio entertainment experience for listeners – in the car, at home, and anywhere on the go with connected devices. Our vision is to shape the future of audio, where everyone can be effortlessly connected to the voices, stories and music they love wherever they are.

This is where a diverse group of emerging talent and legends share authentic and purposeful songs, stories, sounds and insights through some of the best programming and technology in the world. Our critically acclaimed, industry-leading audio entertainment encompasses music, sports, comedy, news, talk, live events, and podcasting. Regardless of their role, each of our employees is vital in bringing SiriusXM’s vision to life daily.

SiriusXM Media
is the gateway for marketers to North America's most prominent digital audio advertising ecosystem. As the combined advertising revenue organization of SiriusXM Holdings Inc., SiriusXM Media spans across leading owned and operated audio platforms Pandora and SiriusXM; innovative ad tech solutions powered by AdsWizz; sonic creative consultancy Studio Resonate; and an extended content network featuring exclusive monetization agreements with Audiochuck, NBC Universal, SoundCloud, and many more. Reaching more than 150 million listeners each month, SiriusXM Media delivers audiences the tailored brand experiences they crave while putting creators first, making it easy for every marketer to produce, plan, buy and measure across its entire audio universe.

About AdsWizz
AdsWizz, a subsidiary of SiriusXM, is the leading global provider of digital audio and podcast advertising solutions. AdsWizz is the underlying monetization solution for well-known music platforms, podcasts, and broadcasting groups worldwide, giving advertisers of all sizes unprecedented access to premium and niche audio content. Through dynamic ad insertion, advanced programmatic platforms, and innovative audio formats, AdsWizz efficiently connects buyers and sellers for digital audio and podcast advertising. AdsWizz is a global company with a presence in over 40 countries and a
Technology Development Hub in Bucharest, Romania.
How You’ll Make An Impact
As a
Staff Software Engineer
, you will join a highly performing-team of engineers who build, own, and maintain backend services and products. You will design, collaborate, and execute building the AdsWizz products at scale while automating and providing insights into the data onboarding with the SXM Media and AdsWizz services.

What You'll Do

• Design and build high-performance, stable, scalable AdsWizz systems that will be deployed in an enterprise setting.
• Develop and maintain technical documentation and ensure knowledge sharing within the team.
• Work with various teams of engineers building software in a collaborative development process.
• Execute tasks with utmost clarity and precision, demonstrating a strong sense of ownership and providing clear direction to drive projects forward effectively.
• Collaborate with the Product team to clarify the scope of the projects, to identify and prioritize project requirements.
• Collaborate with the Global Operations teams to ensure flawless production deployments and support the Incident Management team.
• Serve as a mentor for new colleagues or for junior profiles

What You'll Need

• Bachelor’s Degree in Computer Science/Mathematics or a similar field.
• Strong understanding of engineering software processes, lifecycle methodology, configuration management, release management, and system verification and testing.
• Ability to work independently and oversee entire projects or significant parts, focusing on completing the tasks on time.
• Proven ability to research and become proficient in new technologies
• Experience identifying and debugging performance bottlenecks
• Good understanding of RESTful API design principles, API security standards, and best practices in API versioning and management
• Strong analytical and problem-solving skills, with meticulous attention to detail and a dedication to continuous improvement.
• Proficiency in constructing detailed software architecture diagrams
• Interpersonal skills and ability to interact and work with staff at all levels.
• 7+ years of software engineering experience in Java programming language (preferably JDK17 or higher)
• 4+ years of experience crafting microservices and scalable products, utilizing diverse cloud platforms, ideally AWS.
• Proficient in implementing industry best practices and design patterns tailored for microservices-driven applications.
• Mandatory technical expertise in the following areas:

• REST API-based microservices using SpringBoot and Hibernate
• Reactive programming (RxJava or Webflux)
• Relational Databases (preferably MariaDB or MySQL)
• Caching implementations (like Redis, Memcached, etc)
• Messaging platforms (preferably Kafka)
• Essential Amazon Cloud Services, e.g., S3, CloudTrail, SQS, SNS, and others
• Automated integration testing frameworks and tools, like Wiremock, Cucumber
• Working with containers (Docker, Kubernetes)
• Observability tools like Prometheus, Grafana, ELK stack

• Collaboration tools like Lucidchart, Jira and Confluence
• We consider a plus having good expertise in any of the following areas:

• Designing and maintaining Public APIs
• Security basics (e.g., OAuth2 standard)
• Advanced Amazon Cloud Services, e.g., Lambda, API Gateway, ElasticCache, Athena, Kinesis, EKS, Cognito, and others
• NoSQL database (like Druid, DynamoDB, MongoDB, or others)

Our Offer – What’s In It For You

• Casual & friendly working environment with opportunities to impact the company with your ideas and involvement
• Technology diversity, interesting technical exposure in building the best ad-tech product on the market
• Corporate annual bonus system to celebrate personal and company wins
• Individual training budget to use as you like for skill improvement
• Sports bonus for activities such as gym, biking, and yoga
• Meal tickets card for enjoyable lunch breaks
• Gift cards for special events and holidays
• Days off for your birthday and special events to recharge and enjoy your BIG moment
• Private medical subscription to keep you healthy
• Private Pension Fund (Pillar III) based on your years of tenure
• Free library subscription for the book lover in you
• Suitable hardware devices (new laptops / Macs, displays etc.)
• Parking lots at office location – 60% co-funded by the company
• Company offsites, CSR activities, and getaways to stay connected and keep the flame alive

Our goal at SiriusXM is to provide and maintain a work environment that fosters mutual respect, professionalism, and cooperation. SiriusXM is an equal opportunity employer that does not discriminate based on actual or perceived race, creed, color, religion, national origin, ancestry, alienage or citizenship status, age, disability or handicap, sex, gender identity, marital status, familial status, veteran status, sexual orientation or any other characteristic protected by applicable federal, state or local laws.

The requirements and duties described above may be modified or waived by the Company in its sole discretion without notice.

R-2026-07-120

Join Our Global Development Team and Build Technology That Powers the World’s Leading Banks!

About the Project:
Are you passionate about crafting high-performance systems that connect global markets? Our FX Trading Aggregator enables flawless access to liquidity for top banks and traders worldwide. This is your opportunity to work on a critical platform trusted across the globe. It offers flexible execution management and venue choice, delivering market prices in milliseconds. Our Java-based software runs on hundreds of ser vers across data centers in the U.S., Europe, and Asia— providing real-time, low-latency access to global liquidity. Your Impact You’ll be part of a team that provides end-to-end support for the Aggregator application—from build and development to maintenance and production solving. While we follow Agile practices, we stay ready to respond quickly to urgent production issues when needed.

Requirements – What We're Looking For

• Strong software engineering experience with two languages out of three -Java/C++ and/or Rust.
• AI-first mindset — ability and willingness to effectively leverage AI-assisted development tools to improve productivity, software quality, troubleshooting, documentation, testing, and operational excellence.
• Solid understanding of software design, object-oriented programming, and distributed systems concepts.
• Strong SQL skills and experience working with relational databases.
• Good Linux knowledge, including troubleshooting, scripting, and system operations.
• Ability to design, build, and support highly available, scalable, and performant applications.
• Experience troubleshooting production issues and willingness to participate in production support and incident resolution.
• Ownership mentality with a pragmatic and problem-solving approach.
• Strong communication and teamwork skills.
• Team leadership and mentoring abilities, with the capability to lead technical discussions, coordinate work, and help develop team members.
• Ability to learn and adapt quickly to new technologies, programming languages, and architectural patterns. While Java is the primary language today, future work may involve technologies such as Rust or others as business needs evolve.
• Familiarity with Agile development methodologies.

Desirable Skills

• Experience with event-driven systems, and distributed architecture.
• Familiarity with cloud platforms and containerized environments.
• Exposure to CI/CD, DevOps practices, and infrastructure automation.
• Understanding of UDP multicast to build low latency systems.
• Experience with messaging technologies such as Kafka, Solace, Tibco, or RabbitMQ.
• Understanding of low-latency and high-performance systems.
• Experience with automated testing frameworks and quality engineering practices.
• Financial services, trading, or market connectivity experience.

Career Stage:
Manager

London Stock Exchange Group (LSEG) Information:
Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of
Integrity, Partnership
,
Excellence
and
Change
underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.