Staff / Senior Software Engineer — Berlin, Germany

alexandrusavin@gmail.com · LinkedIn · GitHub

Summary

Staff-level engineer currently building AI-native infrastructure — LLM pipelines, agent orchestration, and evaluation systems — at an early-stage startup in Berlin. Over the past 15+ years I’ve been a founding or early engineer at four startups, including one that reached a successful acquisition within 24 months of launch.

I work best in environments where engineering decisions carry real product weight: designing systems from scratch, setting architectural direction, and scaling both codebases and teams. My core stack spans TypeScript, Node.js, Python, GraphQL, and serverless architectures on AWS and Azure, with hands-on experience across relational, document, and graph databases.

Work Experience

Staff Software Engineer — Interloom Technologies GmbH

Jan 2024 – Present · Berlin, Germany

Founding technical team member at an early-stage AI startup. Responsibilities span architecture, hiring, and active product development on LLM-powered systems.

  • Migrated long-running agent orchestrations to Temporal to ensure durable, fault-tolerant execution of AI pipelines
  • Designed a multi-phase evaluation system (Langfuse-based) covering everything from low-level application prompts to custom user Agent instructions
  • Designed and implemented a manifest-based ingestion protocol for fault-tolerant, large-scale cold-start data imports
  • Established the high-level target architecture post-MVP, enabling the team to scale without accruing structural debt
  • Introduced trunk-based development, feature toggling, and a mono-repo structure to accelerate delivery velocity
  • Led end-to-end technical hiring across backend, DevOps, frontend, and AI/ML disciplines

Stack: Python, FastAPI, GraphQL, AWS, Temporal, Langfuse, LLM pipelines

Staff Software Engineer — Hyperscience GmbH

Dec 2022 – Aug 2023 · Berlin, Germany

Promoted to Staff following integration work post-acquisition. Led cross-team system design and platform-level initiatives.

  • Led the architecture and implementation of an IDP (Intelligent Document Processing) context enhancement solution, enabling enterprise clients to store and manage custom-extracted data
  • Acted as the technical bridge between the acquired Boxplot platform and Hyperscience’s core architecture, collaborating directly with Directors and Engineering Managers
  • Revived and facilitated the Engineering Backend Summit — a monthly lean coffee forum for 25+ backend engineers — closing knowledge gaps and strengthening engineering culture

Stack: Python, Django, Node.js, AWS Lambda, AWS SQS

Senior Software Engineer — Hyperscience GmbH

Jan 2022 – Dec 2022 · Berlin, Germany

Joined via acquisition of Boxplot. Rapidly onboarded into a Python/Django codebase and immediately contributed to core product architecture.

  • Designed the integration solution connecting the acquired Boxplot platform with Hyperscience’s core product, extending it with a fully customisable data management interface

Stack: Python, Django, Node.js, AWS Lambda, AWS SQS

Senior Software Engineer — Boxplot GmbH (Acquired)

May 2020 – Dec 2021 · Berlin, Germany

First engineer and fourth employee. Responsible for building the product from the ground up. The company was acquired within 24 months of its founding.

  • Architected a flexible, graph-based system (Neo4j, Node.js) capable of rapid tactical pivots — a key factor in the successful acquisition
  • Designed a generic, extensible Knowledge Base in a graph database, with a fully adaptive customer-facing interface
  • Built the AWS cloud infrastructure (Terraform), initial CI/CD pipelines (GitHub Actions), and the foundational agile processes and team values
  • Interviewed and onboarded engineering candidates

Stack: TypeScript, Node.js, GraphQL, React, Neo4j, AWS, Terraform

Tech Lead — Fanmiles GmbH

Jan 2019 – Apr 2020 · Berlin, Germany

  • Guided the engineering team through a major organisational restructuring and platform migration, serving as the liaison between upper management and development
  • Managed end-to-end people operations: hiring, salary negotiations, performance reviews
  • Stepped in as Interim Product Owner to keep technical delivery aligned with business objectives during the transition

Stack: JavaScript, Node.js, serverless, AWS, event sourcing

Senior Software Developer — Fanmiles GmbH

Jul 2015 – Dec 2018 · Berlin, Germany

  • Key contributor to the architectural breakdown of a monolith into a modern serverless architecture
  • Part of the core team that shipped the first live version of the Fanmiles platform
  • Designed and implemented event-sourcing systems and a custom OpenID Connect provider
  • Led software design and planning for high-traffic backend systems

Stack: JavaScript, Node.js, MongoDB, serverless, AWS, event sourcing

Senior Software Developer — Klickrent GmbH

Oct 2014 – Jun 2015 · Berlin, Germany

  • Joined as one of the first team members; translated business requirements into a PoC and market-ready MVP
  • Co-designed the company’s initial Agile/Scrum framework

Senior Software Engineer — Zoobe GmbH

Nov 2011 – Aug 2014 · Berlin, Germany

  • Architected a hybrid on-prem (Hetzner) / AWS scaling solution to handle massive usage spikes for live video transcoding while minimising fixed infrastructure costs
  • Implemented MySQL replication (master-master, master-slave) and configured load balancing with HAProxy, Varnish, and Memcached
  • Built live video transcoding and streaming pipelines in Node.js

Stack: JavaScript, Node.js, AWS

Early Career — Romania

2005 – 2012

Freelance Software Developer, Heinen & Hopman, AltFactor (Romanian Space Agency portal & government funding portal), Helmers SRL — building ERP systems, government portals, and web applications in PHP, Drupal, and MySQL.

Stack: PHP, Drupal, MySQL

Education

IT, Mathematics and IT — Universitatea „Spiru Haret” din București (2006 – 2009)

Languages

Language Level
Romanian Native
English C2 (Proficient)
German B1 (Intermediate)