Bill One Development Engineer Sansan, Inc. Engineering Division Bill One Engineering Unit 

© Sansan, Inc. Recruitment Latest issues 6 30 INDEX Development Organizational structure Development Culture 3 4 5 About Sansan Our services Mission, Vision 1 2 02 14 17 21 25 Our appeal 7 31 

© Sansan, Inc. Our services 

© Sansan, Inc. Bill One is the accounting AX solution from Sansan. Bill One solves business challenges in many key areas, such as invoice receipt, expense reimbursement, and accounts receivable. It fundamentally transforms organization-wide workflows that involve supporting documents such as invoices and receipts, improving productivity not only in accounting but across the company. Redefine the unnecessary. Transform how your company works. 

© Sansan, Inc. Bill One’s value proposition One-stop receipt of invoices in any format and centralized management of invoices for contracting companies *When conditions specified by Sansan are met. One-stop receipt 99.9% digitization accuracy Cloud-based centralized management Companies issuing invoices Bill One contracting companies Upload Postal mail Proxy receipt Proxy scanning v Email attachment 

© Sansan, Inc. Bill One’s 3 main benefits Receive all invoices online Build legally compliant workflows Increased productivity organization- wide, not only for accounting 

© Sansan, Inc. Sales and growth Source: Presentation Materials for FY2025 Q2 

© Sansan, Inc. Mission, Vision 

© Sansan, Inc. Mission Statement Invoicing remains a largely analog process. We are transforming every invoice interaction into a digital one. We consolidate invoice information and transform business processes to speed up monthly closing. And we will speed up management by changing centralized invoice information into a company-wide asset and transforming the decision- making process. 

© Sansan, Inc. Vision Build a worldwide invoice network Invoice network Receiving companies Issuing companies Automating routine tasks using connected information Digital interaction accelerates invoicing transactions Advancing digitization of issuing companies through user-friendly DX 

© Sansan, Inc. Organizational structure 

© Sansan, Inc. Designers Engineers Customer Dev. Team (~230 members) PdM Customer Success Sales Marketing PMM Product Dev. Team (~70 members) Architects Division organizational structure 

© Sansan, Inc. Kansai Branch Fukuoka Branch Head Office Chubu Branch Product development team 4 locations (+overseas) 20 teams 4 people (1 team) Overseas offices Sansan Global Development Center, Inc. (Philippines) 

© Sansan, Inc. 3L system Initiatives to expand the scope of team decision-making and speed up development Role Duties ATL (Agile Team Lead) • Promote establishment of self-organized agile teams • Ongoing leadership, planning, execution, risk mitigation, improvement PdL (Product Lead) • Organize specifications and requirements • Coordinate ATL, PdM, design *PdM organizes all PdLs TL (Technical Lead) • Ensure code quality • Improve team’s technical skills • Back-end advisor where logic is focused *These are not job titles; they are roles to be shared within the team Creating an environment that allows you to readily take on challenges and focus on the skills you want to develop Secondary effect 

© Sansan, Inc. Development 

© Sansan, Inc. Technologies and tools used Front-end / BFF Server-side Infrastructure Database Document React express Tool chromatic GitHub Copilot 

© Sansan, Inc. Architecture 

© Sansan, Inc. Development cycle and events Agile development incorporating the essence of Scrum Refinement Daily morning meetings Planning Demos (3 times a week) Reflection Learning sharing 1 week Case-by-case releases (up to 12 a day) Product backlog 

© Sansan, Inc. Culture 

© Sansan, Inc. Concepts that foster organizational culture - Make the final decision yourself after repeated discussion - Determine the essence, quickly output, and make repeated improvements - Give constructive feedback to one another - Continuous learning and change - Everyone takes a leadership role - Value the sense of excitement Culture we aim for Culture-building approach HRT (humility, respect, trust) Individuals act independently, grow, and have a strong sense of unity, with the highest priority on business outcomes 

© Sansan, Inc. Ideas valued in organizational technology - Keep specs simple - Build on valuable technology - Balance development speed and quality - Improve with ownership - Output the challenge and learn from the team Maintain development speed, continue delivering value for years to come 

© Sansan, Inc. Initiatives for improving culture - Encourage zasso (chats/consultation), learning, discussion - Morning meeting, Lunch meeting - Virtual office tools (Teamflow) - Learning sessions (sharing development learnings) - Lessons learned sharing mtgs. (lessons from bugs, etc.) - Improvements apart from functional development - Version upgrade, enhance week - Horizontal teams and guilds - Technical backlogs ▲ Teamflow study group in progress 

© Sansan, Inc. Recruitment 

© Sansan, Inc. Latest issues 1. System scaling Adding features, strengthening infrastructure, improving quality as business expands 2. Lack of engineer resources Want to enable execution of business expansion strategies from various angles 3. Organizational scaling Building an organization that can withstand rapid increase of members Challenges from our rapid business expansion 

© Sansan, Inc. Attractive aspects of work - Business is strong and could become one of the largest SaaS businesses in the country - Startup-like speed and response to market development - Able to deal with product value and user value together with business side - Work on full stack from front-end to infrastructure - Continuous investment outside of functional development of products, such as refactoring, operational improvements, version upgrades - Exciting developments 

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© Sansan, Inc. Appendix 

© Sansan, Inc. Growth support 

© Sansan, Inc. Career path Introduction of mission grades (role grading system): Expected roles and levels of difficulty change for each grade - The higher the mission grade, the greater the sphere of influence e.g., Change from individual → team → group → department → company. Responsible not only for internal coordination but also external coordination, etc. - Salary set for each grade *The above are basic career paths. Assistant Group Manager (MS or higher) Group Manager (M1 or higher) Deputy Head (M3 or higher) Head (M4 or higher) Director, Division Head 

© Sansan, Inc. Initiatives to accelerate growth Q-by-Q evaluation - Self-evaluation and appeals to members - 360-degree evaluation - Evaluation feedback Personal goals using the will-can-must framework - Own future, current analysis, challenges, and specific actions - Sharing and feedback within team, also viewable by non-team members - Reflection 

© Sansan, Inc. Role models - Uses technical skills and expertise to drive projects forward - Consults with team members and decides when skills are lacking - Proactively takes part in study groups and works on improvements, such as with the development flow - Strengths in server-side development and familiarity with cloud computing - Can design for large amounts of data - Experienced in developing in various programming languages, can write balanced test code - Can share knowledge with others and has excellent insight and solutions post-mortem - Makes critical technical decisions with deep understanding of the technical domain and business strategy - Serves as go-to for advanced, complex design and architecture consultation to ensure quality - Responds accordingly to new technological initiatives S5 Engineer A P1 Engineer B P2 Engineer C 

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