Senior Software Engineer (CALC engine)

Aera Technology

Aera Technology

Software Engineering

Cluj-Napoca, Romania

Posted on May 8, 2026
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Aera Technology is the Decision Intelligence company. We deliver innovation and services that enable enterprises to operate sustainably, intelligently, and efficiently. Our platform, Aera Decision Cloud™, integrates with your existing systems to digitize, augment, and automate decisions in real time. Aera helps enterprises around the world transform decision making – delivering millions of recommendations that have resulted in significant revenue gains and cost savings for some of the world’s best-known brands.

The Senior Software Engineer (CALC engine) is a specialised role working on a complex Java based high-performance OLAP engine. Our engine is a multi-dimensional calculation engine with its own modelling language. The model declaration is dynamically compiled into efficient runtime objects.

We use AI-driven development innovation a little differently on the engine because the complexity of the code is often beyond what the AI tooling is capable of. That said, Claude Code is a major part of our lifecycle and is used to focus more efforts on the key areas that drive customer value.

The successful candidate will be working right in the core of the engine, where correctness and quality are as important as calculation performance.

Responsibities:

  • Work closely with the product team to codify design decisions into executable criteria.

  • Collaboratively design and implement high-performance, low latency calculation engine code .

  • Communicate complex technical concepts clearly and effectively to team members and stakeholders.

  • Advocate for correctness-first approaches and foster a culture where quality is paramount.

About you:

  • 8+ years of experience in backend software development.

  • Either:

    • Strong Core Java skills: threading, allocation & garbage collection, performance tuning.

    • Strong domain knowledge in database engine / Compiler design / Investment bank Front office

    • Experience writing low latency Java.

    • Experience of language design.

    • Understanding of how the JVM works.

    • Familiarity with working with AI tools such as Claude Code.

Desirable:

  • Prior experience building planning software

  • Likely (but not exclusively) to have worked in one of the following industry:

    • Database engines (not database implementations)

    • Low latency front office investment bank

    • Compilers

    • Basic understanding of Spring.

    • Knowledge of Multi dimensional modeling.

    • Knowledge of Lambda Architecture (https://en.wikipedia.org/wiki/Lambda_architecture)

At Aera, our purpose is to enable a sustainable, efficient, and intelligent world with Cognitive automation. Our Decision Cloud is increasingly used by the world's largest companies to fundamentally transform their and how work is done.
If you share our passion for building a sustainable, intelligent, and efficient world, you’re in the right place. Established in 2017 and headquartered in Mountain View, California, we're a series D start-up, with teams in Mountain View, San Francisco (California), Bucharest and Cluj-Napoca (Romania), Paris (France), Munich (Germany), London (UK), Pune (India), and Sydney (Australia). So join us, and let’s build this!
Aera Technology is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status.
Benefits Summary
At Aera Technology, we strive to support our Aeranauts and their loved ones through different stages of life with a variety of attractive benefits, and great perks. In addition to offering a competitive salary and company stock options, we have other great benefits available. You’ll find comprehensive medical coverage with a subscription to one of the main private healthcare clinic networks(Regina Maria), paid leave of 25 days/year, remote work reimbursement/ a monthly teleworking allowance, and much more. We offer access to online professional courses for both professional and personal development, via Udemy, coupled with people manager development programs. We believe in a flexible working environment, to allow our Aeranauts to perform at their best, ensuring a healthy work-life balance. When you’re working from the office, you’ll also have access to a fully-stocked kitchen with a selection of snacks and beverages.
Aera Technology respects the privacy of your data. Please take the time to read our European GDPR privacy candidate notice available here.
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