Siddharth Sagar Vasishta is a finance and analytics professional with a strong background in financial analysis, risk analytics, and automation. Currently serving as a Lead Analyst at American Express, he manages financial control activities for over $20M in expenses and analyzes datasets exceeding $100M. He has developed a synthetic portfolio-risk engineering workbench called nAIM, which integrates monitoring, investigation, and reporting functionalities. With expertise in Python, SQL, and Excel, he is focused on leveraging technology to enhance financial decision-making and reporting processes.
- +) Lead monthly accounting and financial control activities for a US$20M+ expense portfolio, covering accruals, prepayments, reconciliations and period-end reporting.
- +) Review dashboards and financial datasets representing US$100M+ in activity, using variance, trend, exposure and exception analysis to identify emerging risks and business drivers.
- +) Automate a majority of recurring accounting and reporting workflows with Python, SQL, Excel and VBA, improving repeatability, auditability and control consistency.
- +) Delivered quarterly reporting through Hyperion, Power BI and Excel, supporting approximately 85% of recurring reconciliation output.
- +) Evaluated insurance-arbitrage and redemption-policy scenarios for transactions exceeding €200K, highlighting assumptions, exceptions and financial implications.
- +) Built and presented VBA and SQL improvements that increased team efficiency by 45% and contributed to a 15% increase in monthly revenue.
- +) Built sensitivity analyses in Tableau and Power Query that helped reduce over-investment in low-ROI areas by 20%.
- +) Produced profitability, cash-flow and inventory reports from SAP and ERP data to support resource allocation and operating decisions.
- +) Connected scenario analysis with working-capital and performance reporting, improving visibility into margin, liquidity and inventory risk.
- +) Led digital communications for FATEH, coordinating campaigns, content and event updates across student teams.
- +) Increased follower engagement by 35% and event visibility and attendance by 25% through planned social promotion.
- +) Created motion graphics, video content and branded assets for event campaigns.
“Someone finally did it! And that someone is ME. I’ve released nAIM: All Is Mine A fully working synthetic risk-analysis application built to solve a problem I kept coming back to: Portfolio data can show what changed. The harder part is understanding where the risk is emerging, what deserves investigation, how the portfolio behaves under different scenarios. nAIM brings monitoring, investigation, scenario analysis, evidence and reporting into one working system. Built across Python, SQL/DuckDB,”
“Hello, World. I completed 10 months at American Express! Alongside the day job, I’ve kept exploring things I genuinely enjoy: finance, AI, analytics, automation and the technology connecting them. Always curious to try my hands on new tech and knowledge. The certificates are nice. The knowledge, and what I can build with it, matters more. Talk soon!”
“Interviewed at an MNC, they produced 10 Dashboards per month, Thats it? Yes that's it, Tableau is much easier than you think, don't waste your time fixing blanks, duplicates, invalid dates, corrupted entries. Spend it seeing this: My toolkit: drop an Excel, click once, receive: A clean CSV, Tableau-ready A data-quality audit that shows every fix made Now Tableau dashboards don’t just load faster, they load right. (Transparency matters, you see what changed and why) No need to comment "XYZ" to ge”
SQL
Excel