Publication
Treat It Like a Product: API Management Best Practices
https://www.toptal.com/product-managers/api/api-management-best-practices
Milos is available for hire
Hire MilosMilos Belcevic
Verified Expert in Product Management
Product Manager
Belgrade, Serbia
Toptal member since April 14, 2022
Bio
Milos is a highly accomplished product expert with experience in technical product management, driving the development and launch of innovative solutions for organizations ranging from an MIT startup to S&P 500 corporations across multiple industries, supported by two master’s degrees and ongoing PhD research in management science and operations research (OR). He is a published author, dedicated mentor, and recognized speaker at TEDx and 20+ product and agile conferences across 8 countries.
Project Highlights
In-house ERP for MIT Startup Nanoramic® Laboratories
Owned several modules for in-house ERP and worked with stakeholders for each area, including IPMS, HR, and accounting. Rehauled and refined the backlog to support the new vision, collaborating with the CEO. I also led a product team of 15-20 people.
400,000+ Users Edtech Platform Redesign and New Features Discovery
Led discovery sessions and planning for the overall platform redesign and new feature initiatives, including AI tutor. I also helped form and coach the cross-functional product team, set up and drove OKRs, and mentored the in-house product lead.
API and MW Enabling Shared Capabilities Across 10+ Apps with Millions of Records
Oversaw API and MW powering shared capabilities across a portfolio of 10+ IP management software solutions, handling millions of records and being used by Fortune 100 companies.
Expertise
- Agile Product Management
- B2B Product Management
- Business to Consumer (B2C)
- Feature Planning
- Product Launch
- Product Research
- Product-market Fit
- Stakeholder Management
Work Experience
Staff Product Manager (Interim)
2025 - PRESENT
Urban Sports Club
- Partnered with payments, member, and data teams to deliver unified product initiatives.
- Drove the monolith-to-microservices migration for the core booking engine, ensuring scalability and unlocking new feature capabilities.
- Conducted product discovery with internal and external stakeholders.
International Speaker and Author
2017 - PRESENT
Self-employed
- Gained recognition on leading expert websites such as Scrum Alliance, Toptal blog, Product School, and Product Talk Academy.
- Worked as an innovation and tech journalist and wrote 20 interviews and features for the most significant business, leadership, and diplomacy magazine in Serbia and the region in English.
- Interviewed leaders from companies, including Google, IBM, Alibaba Group, City AI, Startup Alliance Korea, and Viber.
- Held a TEDx talk and conducted conference talks, workshops and facilitated open-space discussions internationally.
Documentation Analyst
2025 - 2025
International Flavors & Fragrances, Inc. - Nutrition & Biosciences USA 4, Inc.
- Managed assessing and improving standard operating procedures and workflows related to customer-facing and internal documentation.
- Collaborated with SMEs to create and complete missing documents using standardized templates.
- Assessed and verified the accuracy of existing documents and updated as needed.
Fractional Head of Product
2024 - 2025
Feldspar
- Delivered functional POCs to validate technical feasibility and secure product-market fit.
- Partnered with the Founder to align the long-term product vision with commercial goals.
- Managed three hardware streams with external vendors, ensuring on-time and on-budget delivery.
Product Manager
2024 - 2025
FVA Advisory PTE. LTD.
- Worked with the founder to translate their vision into two AI-powered solutions and scope out MVP for each.
- Documented detailed user workflows and managed UI/UX designers.
- Documented technical requirements, the team needs, and the tech stack to deliver two AI-powered solutions.
Business Analyst
2024 - 2024
MailHub Inc
- Collaborated on the intensive discovery phase with the founder.
- Scoped out and structured product backlog into multiple releases for three different applications.
- Worked on competitor analysis, market research, and opportunity mapping.
Product and Operations Lead
2024 - 2024
Feldspar
- Worked with the founder and CEO as the first employee, building up the team and setting up processes and overall operations across marketing and PR, broadcast, product, HR and recruitment, and R&D.
- Collaborated with external partners and agencies within R&D, marketing, production, and PR.
- Led strategy across multiple products and internal tools in both hardware and software.
Technical Product Manager
2023 - 2024
Ultraspeed Digital Limited (Feldspar)
- Assisted the founder in brainstorming and conceptualizing innovative ideas for a sports technology product. Developed the initial framework and roadmap leading to a proof of concept.
- Collaborated with the founder to identify, select, and vet top-tier vendors in research and development.
- Managed collaboration with multiple vendors and freelancers and assisted in setting up and hiring the first in-house team.
Senior Product Manager – API
2022 - 2024
Clarivate Analytics
- Promoted to senior product manager in less than six months. Reorganized the planning cycles, product-related events, and artifacts. Set strategic KPIs and managed the backlog, internal body of knowledge, and stakeholder relationships.
- Supported relationships with more than 10 teams interacting with the API-based product, setting up collaboration processes and feedback loops, along with organizing, updating, and co-creating the knowledge base.
- Took part in organization-wide initiatives such as providing mentorship, knowledge sharing, and colleague resource groups.
Product Manager
2022 - 2023
SAMA - Family-Centric solutions startup by ex-LEGO founder
- Redefined and structured the main value proposition through workshops and tools like business model canvas and value stream mapping. Worked on different package options, revenue streams, and business model innovation.
- Defined and structured the main product hypotheses, connecting them with newly defined KPIs and metrics, and suggested experiments and ways of tracking to validate them.
- Worked with the team on storing and connecting relevant data by integrating various low-code/no-code tools, payment solutions, analytics tools, and more (Bubble.io, PostHog, Airtable, Notion, SendGrid, and Stripe).
Product Owner – API
2022 - 2022
Clarivate Analytics
- Worked as a product owner in charge of API and middleware powering shared capabilities across a portfolio of 10+ IP management software, handling millions of records used by Fortune 100 companies.
- Owned the product backlog, aligning the sprint-based incremental delivery with quarterly and yearly goals and collaborating closely with engineering, delivery, and business stakeholders.
- Introduced and led product-related agile events for a team of 20 members, such as sprint planning, review, backlog refinement, and alignments.
Product Manager—Product Discovery for VR-enabled Therapy Solution
2022 - 2022
Freelance
- Researched the best tech solutions and approaches to implement VR in remote and in-person patient treatments.
- Worked intensively with the founder to help with the ideation and validation of product vision and scope.
- Prepared an extensive product requirements document (PRD) with a solution description, user types and roles, user flow and UX, product and technology fit, high-level roadmap features breakdown, and suggested team requirements.
Product Manager—Payment Collection Feature
2021 - 2021
Graphium Health
- Conducted intensive work on the (pre-)payment collection feature to expand the current offering, implemented in over 350 facilities in the US, with over 250 unique integrations.
- Cooperated with and interviewed diverse stakeholders, such as anesthesia providers and medical experts, to gain feedback and shape and document the feature.
- Documented the feature fully, including value proposition, scoping, roadmap, user stories, the data model, basic mockups, and user flow.
Product Manager
2020 - 2021
CROWDBOTICS
- Led distributed, cross-functional agile teams of 4-8 members serving different B2B and B2C organizations. Managed app development clients from various industries, including two of the company's top five clients.
- Collaborated closely with new startup founders to scope out the MVP and prepare the complete product requirements document and high-objective roadmap with a quick turnover.
- Worked for established organizations on new product and feature initiatives, utilizing experimentation, rapid prototyping, and low- and no-code solutions to gain user feedback and launch fast.
Senior Product Owner
2020 - 2020
Freelance
- Managed multiple B2C web products and apps for support-related services in different industries like travel, legal, moving, and tech support.
- Explored new revenue streams and launched new services.
- Developed mockups, improved user flow, and revamped and re-designed new products and price models.
- Worked closely with the customer success department to improve the product offering and internal tools.
- Coached junior product owners and empowered them for the role.
Product Owner
2020 - 2020
MIT Startup Nanoramic® Laboratories
- Owned several modules for in-house ERP and worked with executive stakeholders for each area, including IPMS, HR, HSE, capacity planning, and accounting.
- Rehauled and refined the backlog to support the new mission and vision, closely working with the CEO.
- Led a distributed product development team of 15-20 people. Facilitated all major product-related meetings on a weekly and monthly basis.
COO
2017 - 2019
Opinodo ApS
- Set up the team and all major processes. Around 80% of my work focused on developing the Opinodo ecosystem and maximizing value around online surveys/market research B2B and B2C platforms we have been developing.
- Achieved five-time more growth in complete surveys per month. Three new market research partners integrated, and over ten countries launched with three times higher earnings per active user.
- Worked closely with co-founders to effectively manage the product vision, roadmap, and strategy for the whole organization. Found new revenue streams, expanded the existing ecosystem and drove product/market fit and business model innovation.
Product Marketing and BizDev Consultant
2015 - 2017
Freelance Clients
- Handled the product launch, product, and content marketing for B2C and C2C eCommerce startups, such as Letgo, the largest marketplace for used goods, Cuponation, the ruling coupon site in Europe, and Delticom, Europe's largest eCommerce for tires.
- Collaborated closely with internal and external cross-functional marketing teams.
- Led teams of five to ten members, depending on the project.
SEO Manager
2014 - 2015
MyTrendyPhone
- Assisted in ranking competitive pages on the top of Google for Norway and Denmark.
- Collaborated closely with the internal team, including development, design, copywriting, and external marketing agencies.
- Increased the conversion rate, decreased the bounce rate, and the overall performance of main pages.
Project History
In-house ERP for MIT Startup Nanoramic® Laboratories
https://www.nanoramic.com/Owned several modules for in-house ERP and worked with stakeholders for each area, including IPMS, HR, and accounting. Rehauled and refined the backlog to support the new vision, collaborating with the CEO. I also led a product team of 15-20 people.
Starting at MIT in 2009, Nanoramic Labs is a unique R&D company applying deep tech to some of the most significant problems the industry faces—energy storage and thermal management—by developing cutting-edge materials, structures, and processes based on carbon composites.
The company received more than $12 million in grant funding and government awards from NASA, the Department of Energy, AFWERX (the innovation arm of the Department of Air Force), and more.
400,000+ Users Edtech Platform Redesign and New Features Discovery
Led discovery sessions and planning for the overall platform redesign and new feature initiatives, including AI tutor. I also helped form and coach the cross-functional product team, set up and drove OKRs, and mentored the in-house product lead.
Campster is an online learning platform with over 400,000 users in seven countries in Europe and Asia. They focus on community-driven learning and collaboration, gamification, and AI to solve motivation and improve learning outcomes.
Campster’s learning methodology is based on the research of one of the founders, an Oxford PhD. The startup received grants from several European and national funds for digital innovation, such as EBRD.
Ecosystem of Three Platforms for Market Research
Achieved a 5-times growth in completed surveys per month, integrated three new market research partners, launched the product in 10+ countries, and accomplished 3-times higher earnings per active user (survey respondent).
I was the COO at a Danish startup focused on market research, email marketing, and online surveys. This startup has a presence in over 15 European markets and hundreds of thousands of complete survey interviews.
I worked on expanding the product offering and ecosystem: a B2B platform for market research agencies to manage and run their survey campaigns, a B2B platform for online publishers to recruit survey respondents, and a B2C platform for the respondents to register, take surveys, and earn rewards.
Payment-related Feature for a Healthtech SaaS
https://graphiumhealth.com/Led the research and planning for the new feature initiative.
Graphium Health is a leading provider of anesthesia electronic medical record software and billing functionality, implemented in over 400 facilities in the U.S. with 250+ unique integrations.
At the time of my engagement, there was no billing and payment collection feature, and executive stakeholders decided to explore this opportunity.
I worked closely with founders, medical professionals, and tech leads to help prioritize and scope out the MVP and prepare all key elements for the initiative, such as user flow, data model, and basic UI/UX.
Product Discovery for a VR-based Mental Health Product
Prepared an extensive PRD with solution description, user types and roles, user flow and UX, product and technology fit, high-level roadmap, features breakdown, and suggested team requirements for MVP and long-term product goals.
I worked intensively with the founder to scope out and envision a VR-enabled solution for patient treatment in-person and remote through mobile apps and patient and therapist portals.
Researched best solutions, highlighted tradeoffs and benefits of different approaches, and laid out the foundation for further product development.
API and MW Enabling Shared Capabilities Across 10+ Apps with Millions of Records
Oversaw API and MW powering shared capabilities across a portfolio of 10+ IP management software solutions, handling millions of records and being used by Fortune 100 companies.
As a senior product manager, I owned the product backlog, led all product-related agile events for the team of 20 members, aligned the sprint based on quarterly and yearly goals, and collaborated closely with engineering, delivery, and business stakeholders.
Other Experience
Education
2024 - 2026
Progress Towards a PhD in Operations Research, Management Science
Faculty of Organizational Sciences – University of Belgrade - Belgrade, Serbia
2017 - 2019
Master's Degree in Engineering Management
Singidunum University - Belgrade, Serbia
2016 - 2017
Master's Degree in Marketing and Communication
Rome Business School - Rome, Italy
Certifications
JUNE 2026 - PRESENT
Certified Product Innovation Professional - CPIP
Spark Engine
MAY 2024 - PRESENT
Certified Agile Leader 1 (CAL1)
Scrum Alliance
AUGUST 2022 - PRESENT
Senior Product Manager Certification
Product School
JUNE 2022 - PRESENT
Certified AI Product Manager
Udacity
OCTOBER 2021 - PRESENT
Certified Data Product Manager
Udacity
DECEMBER 2020 - PRESENT
Certified Kanban Professional
Kanban University
SEPTEMBER 2020 - PRESENT
Certified Scrum Professional (CSP) – Product Owner
Scrum Alliance
DECEMBER 2019 - PRESENT
Certified LeSS Practitioner
LeSS Company
APRIL 2018 - PRESENT
Certified Scrum Master
Scrum Alliance
OCTOBER 2015 - PRESENT
Certified E-business and Internet Marketing Manager
IT Academy Belgrade
Skills
Tools
Trello, Jira, Figma
Paradigms
Agile, Agile Product Management, Marketplace Platforms, B2C, B2B2C, Requirements Analysis, Iterative Development, Design Thinking, Business to Business to Consumer (B2B2C), Agile Project Management, User Testing, Change Management, Scrum, Kanban, Digital Marketing Best Practices, Scalable Application, Data Product Management, Low Code, Gamification, Azure DevOps
Platforms
ProductPlan, Digital Advertising Platforms, Enterprise Resource Planning (ERP), AWS IoT, Magento, Shopify
Industry Expertise
Healthcare, Marketplaces, Product Ideation, Education Technology (Edtech), Financial Services, Health, Target Markets (Parents), Sports
Other
Product Research, Business Models, Feature Analysis, Feature Planning, Product Management, Stakeholder Management, Product Ownership, MVP Design, Product Launch, Product-market Fit, Business Process Modeling, Product Roadmaps, Minimum Viable Product (MVP), Backlog Management, Product Owner, Software as a Service (SaaS), B2B Product Management, Business to Business (B2B), Process Flows, User Research, Technical Product Management, Startups, Business to Consumer (B2C), Project Planning, New Product Development, Product Discovery, New Product Business Cases, Feasibility Studies, SaaS, New Products & Services, Product Strategy Consultant, B2B, Product Requirements Documentation (PRD), Project Management, UX Wireframes, Product Planning, Wireframing, Roadmaps, Process Improvement, Agile Leadership, Feature Prioritization, Feature Roadmaps, Product Consultant, Early-stage Startups, Business Cases, Workflow, Health IT, Digital Health, User Requirements, System Requirements, Business Analysis, User Stories, Business Strategy, Value Proposition, Go-to-market Plans, Go-to-market (GTM) Strategy, Competitor Analysis & Profiling, Strategy, Product Development, Conceptualization, Pitch Decks, Ideation, Feature Backlog Prioritization, Market Research & Analysis, Requirements, Prototyping, User Acceptance Testing (UAT), GAP Analysis, Product Strategy, Remote User Testing, User Feedback, Key Performance Indicators (KPIs), Sprint Planning, Critical Thinking, User Journeys, Subscriptions, Discovery, Discovery Workshops, Web Applications, Monetization, Planning, Artificial Intelligence Product Manager, ChatGPT, IT Product Management, Mentorship & Coaching, Product Operations, Consulting, Education, Educational Platform Design, Monetization Models, Business Proposals, Market Research, Investor Presentations, Competition Research, Customer Research, Digital Product Management, Vendor Management, Digital Transformation, Customer Journey, Customer Retention, User Conversion, Revenue Strategy, Mobile Apps, Pitch Presentations, Operational Efficiency Improvement, Backlog Grooming, ERP Implementation, Competitive Analysis, Competitive Intelligence, Market Strategy and Research Product Manager, Business Requirements, Stakeholder Engagement, Business Process Management (BPM), Platforms, Research, Web App Development, Documentation, Agile Product Management, Product Management, Project Management, Technical Project Management, Minimum Viable Product (MVP), Integration, Product Analytics, Learning Management Systems (LMS), Legacy Software, Training & Training Content Development, System Migration, Growth Strategy, Product Growth, Agile Delivery, Innovation Management, Product Marketing, Marketing, Public Relations (PR), Remote Team Leadership, Product Coach, Chief Operations Officer (COO), Data Product Manager, Business Development, Internet Marketing, eCommerce, Digital Marketing, B2B Partnerships, Project Rescue, User Experience (UX), UX Process, Mobile Applications, Healthcare IT, Product Design, User Interface (UI), Machine Learning, Fintech, Digital Payments, Lead Generation, Fintech Consultant, Finance, Web Design, Website Redesign, Digital Advertising, Project Budget Management, Artificial Intelligence (AI), Analytics, Mobile User Acquisition, Edtech Design, Mockups, Reporting, Dashboards, Lucidchart, Business Coaching, Growth Hacking, Scrum Master, Project Timelines, Technical Project Management, Graphical User Interface (GUI), Budgeting, Process Optimization, Training, Agency, Software Integration, Web & Mobile Applications, Project Review, REST APIs, Content Management, Personal Branding, CRM Systems, Payment Gateways, Workflow Automation & System Integration, Advisory, Social Media, Social Media APIs, API Integration, Integrated Sales & Operational Planning, Generative Artificial Intelligence (GenAI), AI Product Management, Vendor Selection, Manufacturing, Manufacturing Product Manager, Manufacturing Resource Planning (MRP), Process Automation, Healthtech, Estimations, Web Scraping, Technical Business Analysis, iOS, APIs, API Applications, AI Design, Technical Requirements, Software Development Lifecycle (SDLC), Project Scoping, Process Mapping, Coaching, CRM APIs, Data-driven Dashboards, Scalability, AI Consulting, Language Models, Data Security, Large Language Models (LLMs), Retrieval-augmented Generation (RAG), Artificial Intelligence (AI), React Native, AI Integration, Data Management, ClickUp, Program Increment Planning, Consumer Applications, Funnel Optimization, Funnel Analysis, Lead Conversion, User Onboarding, Cross-functional Team Leadership, P&L Management, Large-scale Scrum (LeSS), Product Portfolio Manager, SEO Content, Copywriting, Norwegian, Web Marketing, Translation, Technical Writing, Story Mapping, User Flows, Psychology, User Roles, UX Design, Aha!, Claims, Enterprise SaaS, Enterprise, Agile Product Delivery, Structured Facilitation, Music Production, User Surveys, Notion, Bubble, Monitoring, Iteration Management, Audience Targeting, Public Speaking, Internet of Things (IoT), Software Development, Data Science, Engineering, Mechanical Engineering, Supply Chain, Operations, Operations Management, Stripe, Statistics, Optimization, Organizational Strategy, Sales Forecasting, Cost Estimation, SQL, SaaS Product Management, SaaS Strategy, Healthcare Software, Software Deployment, Chatbots, Amazon Web Services (AWS), Product Leadership, Claude Code, Linear
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