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Salary
$31k – $57k per year
Location
Hybrid (Tokyo, Japan)
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 19, 2026. First seen by Alion on Jul 1, 2026.

Overview
Company
Impact
Profile match
MJOLNIR SPACEWORKS is a Japanese space startup that aims to make space travel as ordinary as driving a car, starting with mass production of rocket engines. Its engineering work includes multiphysics flight simulation, digital twins, design automation and FEM and CFD analysis, and it hires senior software engineers for its DX team and an IT administrator. The company is based in Tokyo, Japan.

シニアソフトウェアエンジニア(DX Team)

Description

DXの中核デジタル基盤をエンドツーエンドで構築するため、「シニアソフトウェアエンジニア(DX Team)」を募集しています。

本ポジションは、優先度に応じてバックエンドシステム、データワークフロー、クラウド/インフラ領域を横断して取り組めるエンジニア向けです。

エンジニアリング部⾨およびリーダーシップと直接連携し、ミッションシミュレーション、設計⾃動化、全社的な⽣産性向上を⽀える社内システムを実装していただきます。

具体的には、

・ミッション設計・解析・運⽤⽀援のための⾼度なマルチフィジックス⾶⾏シミュレーションおよびデジタルツインシステムの構築

・⾼速なパラメトリック設計⽣成、最適化、反復を実現する⾃動化システムの開発

・⾼度なFEM/CFD解析を 再現可能なエンジニアリングワークフローに統合する検証エンジンの構築

・複数プロジェクト横断で連携し、開発ワークフローおよび社内オペレーションのボトルネックを特定‧⾃動化

・DXが保有するシステムの信頼性‧セキュリティ‧可観測性の向上

・DX組織の 成⻑に 合わせたドキュメント整備、エンジニアリング標準の整備、チームスケーリングへの貢献

-----------------------------------------------------

We are hiring a Senior Software Engineer (DX Team)to help build our core digitalstack end-to-end.

This role is for an engineer who can move between backend systems, dataworkflows, and cloud/infrastructure tasks based on priority.

You will work directly with engineering and leadership to ship internal systems thatsupport mission simulation, design automation, and organization-wide productivity.

・Build advanced multiphysics flight simulation and digital twin systems formission design, analysis, and operations support.

・Develop automation systems for rapid parametric design generation,optimization, and iteration.

・Build verification engines that integrate advanced FEM and CFD simulationsinto repeatable engineering workflows.

・Collaborate across projects, identify and automate bottlenecks acrossengineering workflows and internal operations.

・Improve reliability, security, and observability of DX-owned systems.

・Support documentation, engineering standards, and team scaling as the DXorganization grows.

Requirements

DXの中核デジタル基盤をエンドツーエンドで構築するため、「シニアソフトウェアエンジニア(DX Team)」を募集しています。

本ポジションは、優先度に応じてバックエンドシステム、データワークフロー、クラウド/インフラ領域を横断して取り組めるエンジニア向けです。

エンジニアリング部⾨およびリーダーシップと直接連携し、ミッションシミュレーション、設計⾃動化、全社的な⽣産性向上を⽀える社内システムを実装していただきます。

具体的には、

・ミッション設計・解析・運⽤⽀援のための⾼度なマルチフィジックス⾶⾏シミュレーションおよびデジタルツインシステムの構築

・⾼速なパラメトリック設計⽣成、最適化、反復を実現する⾃動化システムの開発

・⾼度なFEM/CFD解析を 再現可能なエンジニアリングワークフローに統合する検証エンジンの構築

・複数プロジェクト横断で連携し、開発ワークフローおよび社内オペレーションのボトルネックを特定‧⾃動化

・DXが保有するシステムの信頼性‧セキュリティ‧可観測性の向上

・DX組織の 成⻑に 合わせたドキュメント整備、エンジニアリング標準の整備、チームスケーリングへの貢献

-----------------------------------------------------

We are hiring a Senior Software Engineer (DX Team)to help build our core digitalstack end-to-end.

This role is for an engineer who can move between backend systems, dataworkflows, and cloud/infrastructure tasks based on priority.

You will work directly with engineering and leadership to ship internal systems thatsupport mission simulation, design automation, and organization-wide productivity.

・Build advanced multiphysics flight simulation and digital twin systems formission design, analysis, and operations support.

・Develop automation systems for rapid parametric design generation,optimization, and iteration.

・Build verification engines that integrate advanced FEM and CFD simulationsinto repeatable engineering workflows.

・Collaborate across projects, identify and automate bottlenecks acrossengineering workflows and internal operations.

・Improve reliability, security, and observability of DX-owned systems.

・Support documentation, engineering standards, and team scaling as the DXorganization grows.

Preferred Experiences

  • 歓迎する経験・スキル

・科学技術計算(シミュレーション、最適化、数値計算)の実務経験

・クラウド基盤(AWS/GCP)およびInfrastructure as Code(Terraform)の知識・経験

・CAD/CAEの利用経験

・アジャイル開発手法の実務経験

-----------------------------------------------------

  • Preferred skills

・Experience with scientific simulation, optimization, numerical methods.

・Familiarity with cloud platforms (AWS/GCP) and infrastructure as code(Terraform).

・Exposure to security practices for internal platforms (secrets handling, accesscontrol, auditability).

・Experience with CAD/CAE.

・Experience in Agile methodology.

We are looking for

Working Conditions

Salary

月額41万円~75万円程度 / Approximately JPY 410,000 to 750,000 per month

※⽉30時間相当の固定残業⼿当を含みます。/ Includes fixed overtime allowance equivalent to 30 hours per month.

Location

東京・品川(駅から徒歩5分) ※関東エリアでのハイブリッド勤務 / Main office: Tokyo, Shinagawa (5 min walk from the station). ※Hybrid in the Kanto area, Japan.

※リモート勤務:週3~4日 / Remote work: 3-4 days per week.

※出社:週1日以上 / Onsite: at least 1 day per week

Job Type

正社員 / full-time employee

Work hours

09:00~18:00(休憩1時間)

※詳細は就業規則による

Standard start time at 09:00 (full details are provided incompany work rules).

完全週休二日制(土・日) 年間休日125日

・有給休暇(入社時付与)

・リフレッシュ休暇

Annual holidays: 125 days.

Paid leave: up to 20 days granted at joining, then 20 days from the followingfiscal year.

refresh leave

Probation period

あり(3ヶ月)

Benefits

社会保険:健康保険、厚生年金、雇用保険、労災保険

諸手当:通勤手当(月額上限5万円)、残業手当

Social insurance: health insurance, pension, employment insurance, andworkers’ compensation insurance.

Allowances: commuting allowance (monthly cap: JPY 50,000) and overtimeallowance.

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