About Jojoo
Are you looking for a friendly, thoughtful, and transparent professional to support your workflow, backend development initiatives, product or teams? I can help your growing business or enterprise team by mapping your existing codebase and identifying bottlenecks tied directly to business goals.
I can support your team to implement targeted improvements, aligning the technical roadmap with your runway, revenue milestones and upcoming releases.
I have experience leading software development teams and also executing as a senior engineer, so I bring to your product, team or scoped project both leadership and hands-on delivery.
Satisfied clients like working with me, because I lean attentively into their needs, execute with focus, and create long-lasting, reliable and compliant solutions.
English
Native or bilingual
German
Conversational
Can work on-site
Berlin (up to 50km)
Experience
- FireStackAI Solutions Architect, Forward Deployed EngineerAugust 2025 - Today (11 months)Berlin, GermanyBuilt and run a config-driven VAT-compliance pipeline (Node.js, n8n, Postgres) for my company's real quarterly filings, cutting an estimated 1.5–2 hours of manual reconciliation and calculation each time versus doing it in a spreadsheet.
- Extracts invoice data with an LLM (Claude, with a Gemini fallback for reliability), so it keeps working even if one provider has an outage.
- E-invoice checks (ZUGFeRD/XRechnung, including §13b reverse charge) matched against Germany's official KoSIT validator: zero false positives.
- Encodes VAT and e-invoicing research once, so it doesn't need re-deriving for every return.
- Output is a draft ready for accountant sign-off, not full auto-submission, by design.
Designed and delivered a compliance automation system for a team inside a major logistics enterprise, full-stack, solo, in two weeks, taking a recurring task off their plate for good.- Backend authentication (Go), a browser extension, and a high-volume data pipeline, shipped with cloud CI/CD.
- Freed them to focus on higher-priority work instead of the manual process this replaced.
Engineered a governance and audit layer (Go CLI + MCP server) for directing coding agents like Claude Code, Gemini and Qwen, so I can move fast on client engagements and product engineering without losing oversight.- Guardrails block dangerous commands, redact secrets, and scan dependencies for vulnerabilities before anything ships.
- Every decision gets check-pointed into an audit trail (50+ recorded to date), so the reasoning is not a black box, and stays reviewable.
- Runs across tools through the Model Context Protocol (MCP), rather than locking into one vendor.
- HelloFresh SEEngineering Manager + Stream LeadFebruary 2022 - December 2024 (2 years and 10 months)Berlin, Germany
- Directed a cross-functional team of 10+ backend, frontend, and QA engineers, tripling delivery velocity and serving millions of customers through clear planning, roadmap execution, and agile collaboration.
- Co-led delivery of a company-wide marketing initiative that increased customer lifetime value.
- Documented 130 test cases (covering 11% of test coverage across 3 departments), and drove adoption of documentation best practices to improve QA collaboration and visibility.
- Reviewed and enhanced five technical onboarding modules (Kafka, Vault, Unit Testing, Grafana Loki, Agile) and unblocked Kafka training path after a 3-month delay.
- Authored and reviewed Architectural Decision Records (ADRs), created and delivered 60+ roadmap tickets.
- Conducted more than fifteen advanced-stage interviews (System Design, Live Coding, General Tech) across five alliances and submitted 100% of scorecards within 10 hours, accelerating VP and Director-level hiring decisions.
- Mentored 5+ engineers and cross-functional professionals through 80+ sessions in formal mentorship programs.
- HelloFresh SELead Software EngineerMay 2019 - February 2022 (2 years and 9 months)Berlin, Germany
- Led migration of a legacy revenue and dunning system from PHP monolith to Go microservices and Python pipelines, improving maintainability and accelerating deployment by 6x.
- Delivered roadmap milestones for €200M revenue initiatives, including fraud detection features in the Payments and Finance domain.
- Collaborated with product leads and engineers to define business-critical KPIs, visualizing metrics that drove a 3x improvement in team operational performance within 12 months.
- Developed a custom Python Prometheus metrics library to enhance observability, enabling proactive incident prevention and improving system resilience; collaborated closely with SRE and backend leads.
- Optimized CI/CD pipelines using data-driven analysis and devops pairing sessions, achieving a 5x deployment speedup and reducing deployment errors by 20%.
- Established a strong engineering culture grounded in TDD, pair and mob programming, reducing change failure rate (CFR) by 40% and significantly improving production reliability and customer experience.
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Education
- Master of ScienceSwansea University2017Master of Science
- Bachelor of ScienceKNUST2009Bachelor of Science